CHANGELOG.md

CHANGELOG

All notable changes to Zebra are documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Zebra 2.0.0-rc.0 - 2024-10-11

This version is a release candidate for the Zcash NU6 network upgrade on the Mainnet. While this version does not yet include the NU6 Mainnet activation height or current protocol version, all required functionality and tests are in place.

Please note that support for this release candidate is expected to conclude prior to the NU6 activation heights.

Security

• Added Docker Scout vulnerabilities scanning (#8871)

Added

• Added Regtest-only generate and stop RPC methods (#8849, #8839, #8863)
• Added fields to getmininginfo RPC method response (#8860)
• Copied the Python RPC test framework from zcashd into Zebra (#8866)

Changed

• Regtest halving interval to match zcashd and added a configurable halving interval for custom testnets (#8888, #8928)
• Updates post-NU6 Major Grants funding stream address on Mainnet (#8914)

Fixed

• Remove debugging output by default in Docker image (#8870)
• Fixes a typo in configuration file path of the docker-compose file (#8893)
• Return verification errors from sendrawtransaction RPC method (#8788)
• Respond to getheaders requests with a maximum of 160 block headers (#8913)
• Avoids panicking during contextual validation when a parent block is missing (#8883)
• Write database format version to disk atomically to avoid a rare panic (#8795)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @dismad, @gustavovalverde, @oxarbitrage, @skyl and @upbqdn

Zebra 1.9.0 - 2024-08-02

This release includes deployment of NU6 on Testnet, configurable funding streams on custom Testnets, and updates Zebra's end-of-support (EoS) from 16 weeks to 10 weeks so that it will panic before the expected activation height of NU6 on Mainnet.

It also replaces the shielded-scan compilation feature with a new zebra-scanner binary, adds a TrustedChainSync module for replicating Zebra's best chain state, and a gRPC server in zebra-rpc as steps towards zcashd deprecation.

Recovering after finalizing a block from a chain fork

Zebra doesn't enforce an end-of-support height on Testnet, and previous versions of Zebra could mine or follow a chain fork that does not activate NU6 on Testnet at height 2976000. Once a block from a fork is finalized in Zebra's state cache, updating to a version of Zebra that does expect NU6 activation at that height will result in Zebra getting stuck, as it cannot rollback its finalized state. This can be resolved by syncing Zebra from scratch, or by using the copy-state command to create a new state cache up to height 2975999. To use the copy-state command, first make a copy Zebra's Testnet configuration with a different cache directory path, for example, if Zebra's configuration is at the default path, by running cp ~/.config/zebrad.toml ./zebrad-copy-target.toml, then opening the new configuration file and editing the cache_dir path in the state section. Once there's a copy of Zebra's configuration with the new state cache directory path, run: zebrad copy-state --target-config-path "./zebrad-copy-target.toml" --max-source-height "2975999", and then update the original Zebra configuration to use the new state cache directory.

Added

• A zebra-scanner binary replacing the shielded-scan compilation feature in zebrad (#8608)
• Adds a TrustedChainSync module for keeping up with Zebra's non-finalized best chain from a separate process (#8596)
• Add a tonic server in zebra-rpc with a chain_tip_change() method that notifies clients when Zebra's best chain tip changes (#8674)
• NU6 network upgrade variant, minimum protocol version, and Testnet activation height (#8693, 8733, #8804)
• Configurable NU6 activation height on Regtest (#8700)
• Configurable Testnet funding streams (#8718)
• Post-NU6 funding streams, including a lockbox funding stream (#8694)
• Add value pool balances to getblockchaininfo RPC method response (#8769)
• Add NU6 lockbox funding stream information to getblocksubsidy RPC method response (#8742)

Changed

• Reduce the end-of-support halt time from 16 weeks to 10 weeks (#8734)
• Bump the current protocol version from 170100 to 170110 (#8804)
• Track the balance of the deferred chain value pool (#8732, #8729)
• Require that coinbase transactions balance exactly after NU6 activation (#8727)
• Support in-place disk format upgrades for major database version bumps (#8748)

Fixed

• Return full network upgrade activation list in getblockchaininfo method (#8699)
• Update documentation for the new zebra-scanner binary (#8675)
• Update documentation for using Zebra with lightwalletd (#8714)
• Reduce debug output for Network on Regtest and default Testnet (#8760)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @conradoplg, @dependabot[bot], @oxarbitrage, @therealyingtong and @upbqdn

Zebra 1.8.0 - 2024-07-02

• Zebra now uses a default unpaid actions limit of 0, dropping transactions with any unpaid actions from the mempool and excluding them when selecting transactions from the mempool during block template construction.
• The zebrad binary no longer contains the scanner of shielded transactions. This means zebrad no longer contains users' viewing keys.
• Support for custom Testnets and Regtest is greatly enhanced.
• Windows is now back in the second tier of supported platforms.
• The end-of-support time interval is set to match zcashd's 16 weeks.
• The RPC serialization of empty treestates matches zcashd.

Added

• Add an init function for a standalone ReadStateService (#8595)
• Allow configuring more parameters on custom Testnets and an NU5 activation height on Regtest (#8477, #8518, #8524, #8528, #8636)
• Add default constructions for several RPC method responses (#8616, #8505)
• Support constructing Canopy proposal blocks from block templates (#8505)

Docs

• Document custom Testnets, Regtest and how they compare to Mainnet and the default Testnet in the Zebra book (#8526, #8636)

Changed

• Use a default unpaid action limit of 0 so that transactions with unpaid actions are excluded from the mempool and block templates by default (#8638)
• Lower the mandatory checkpoint height from immediately above the ZIP-212 grace period to immediately below Canopy activation (#8629)
• Use the new zcash_script callback API in zebra-script, allowing Zebra's ECC dependencies to be upgraded independently of zcash_script and zcashd (#8566)
• Put Windows in Tier 2 of supported platforms (#8637)
• Remove experimental support for starting the zebra-scan in the zebrad process as a step towards moving the scanner to its own process (#8594)
• Reduce the end of support time from 20 weeks to 16 weeks (#8530)
• Restore parts of the experimental internal-miner feature for use on Regtest (#8506)

Fixed

• Allow square brackets in network config listen addr and external addr without explicitly configuring a port in the listen addr (#8504)
• Fix general conditional compilation attributes (#8602)
• Update median_timespan() method to align with zcashd implementation (#8491)
• Allow custom Testnets to make peer connections (#8528)
• Refactor and simplify the serialization of empty treestates to fix an incorrect serialization of empty note commitment trees for RPCs (#8533)
• Fix port conflict issue in some tests and re-enable those tests on Windows where those issues were especially problematic (#8624)
• Fix a bug with trailing characters in the OpenAPI spec method descriptions (#8597)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @conradoplg, @gustavovalverde, @oxarbitrage and @upbqdn

Zebra 1.7.0 - 2024-05-07

In this release we introduce Regtest functionality to Zebra and restored Windows support. Also adjusted our Zebra release interval from 2 weeks to 6 weeks approximately.

Added

• Preparing for upstream zcash_client_backend API changes (#8425)
• Regtest support (#8383, #8421, #8368, #8413, #8474, #8475)
• Allow Zebra users to contribute to the P2P network even if behind NAT or firewall (#8488)

Changed

• Adjust estimated release interval to once every 6 weeks and the end of support from 16 to 20 weeks (#8429)

Fixed

• Bump zcash script v0.1.15 and restore Windows support (#8393)
• Avoid possibly returning data from different blocks in z_get_treestate RPC method (#8460)
• Zebra panics with all features and no elasticsearch server available (#8409)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @oxarbitrage and @upbqdn

Zebra 1.6.1 - 2024-04-15

This release adds an OpenAPI specification for Zebra's RPC methods and startup logs about Zebra's storage usage and other database information.

It also includes:

• Bug fixes and improved error messages for some zebra-scan gRPC methods
• A performance improvement in Zebra's getblock RPC method

Added

• Log database information such as storage usage on startup and shutdown (#8336, #8389)
• OpenAPI specification for Zebra's RPC methods (#8342)
• Add block times to output of getblock RPC method when called with verbosity = 2 (#8384)

Changed

• Removed Copy trait impl for Network (#8354)
• Refactored code for network consensus parameters to Network methods (#8340)

Fixed

• Improve zebra-scan gRPC method errors and add timeout to scan service to avoid hanging (#8318)
• Await state service requests in getblock method in parallel (#8376)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @elijahhampton, @gustavovalverde, @idky137, @mpguerra, @oxarbitrage, @upbqdn and @zancas

Zebra 1.6.0 - 2024-02-23

This release exposes the shielded scanning functionality through an initial version of a gRPC server, documented in the Zebra Book.

Note

Building Zebra now depends on protoc. See the Build Instructions for more details.

Added

• Add docker-compose file to run CI locally (#8209)
• Allow users to use Zebra + LWD with persistent states (#8215)

Scanner

• Add a new zebra-grpc crate (#8167)
• Start scanner gRPC server with zebrad (#8241)
• Add gRPC server reflection and document how to use the gRPC server (#8288)
• Add the GetInfo gRPC method (#8178)
• Add the GetResults gRPC method (#8255)
• Add the Scan gRPC method (#8268, #8303)
• Add the RegisterKeys gRPC method (#8266)
• Add the ClearResults and DeleteKeys gRPC methods (#8237)
• Add snapshot tests for new gRPCs (#8277)
• Add unit tests for new gRPCs (#8293)
• Create a tower Service in zebra-scan (#8185)
• Implement the SubscribeResults scan service request (#8253)
• Implement the ClearResults scan service request (#8219)
• Implement the DeleteKeys scan service request (#8217)
• Implement the RegisterKeys scan service request (#8251)
• Implement the Results scan service request (#8224)
• Test the RegisterKeys scan service request (#8281)
• Add ViewingKey type in zebra-chain (#8198)
• Handle RegisterKeys messages in scan task (#8222)

Changed

• Remove rfc.md file (#8228)
• Update Debian from Bullseye to Bookworm in Docker (#8273)
• Remove Zebra RFCs from CONTRIBUTING.md (#8304)
• Publish fewer tags in Docker Hub (#8300)
• Add Zebra crate versions to dev-dependencies and remove circular dev-dependencies (#8171)
• Update docs for building Zebra (#8315)

Fixed

• Set log rotation to avoid docker bugs (#8269)
• Improve error message in non_blocking_logger test (#8276)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @bishopcheckmate, @chairulakmal, @gustavovalverde, @mpguerra, @oxarbitrage and @upbqdn.

Zebra 1.5.2 - 2024-01-23

This release serves as a hotfix for version 1.5.1, addressing issues encountered after its initial release. For more information about version 1.5.1, refer to this link.

Following the release on GitHub, we identified difficulties in publishing the zebra-chain crate to crates.io. Detailed information is available in issue #8180 and its references.

Unfortunately, to resolve this challenge, which involves an unpublished dependency, we had to temporarily remove the internal miner support introduced in version 1.5.1.

In our efforts to reinstate this feature, we've opened a tracking ticket to monitor the progress of the required code that must be merged into the equihash dependency. You can follow the developments in issue #8183, which will only be closed once the feature is successfully restored.

Breaking Changes

• Temporally remove the internal miner functionality (#8184)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @oxarbitrage

Zebra 1.5.1 - 2024-01-18

This release:

• Adds a utility for reading scanning results, and finalizes the MVP features of the scanner.
• Adds an experimental internal-miner feature, which mines blocks within zebrad. This feature is only supported on testnet. Use a more efficient GPU or ASIC for mainnet mining.
• Contains many documentation improvements.

Added

• Add an internal Zcash miner to Zebra (#8136, #8150)
• Blockchain scanner new features:
  • Don't scan and log if we are below sapling height (#8121)
  • Restart scanning where left (#8080)
  • Add scanning result reader utility (#8104, #8157)
• Note default path to config in docs (#8143)
• Document how to add a column family (#8149)

Changed

• Make sure scanner database is accessed using the correct types (#8112)
• Move history tree and value balance to typed column families (#8115)
• Refactor the user documentation for scanning (#8124)
• Refactor user & dev documentation (#8145)
• Improve feature flag docs (#8114)
• Allow opening the database in a read-only mode (#8079)
• Send all zebrad logs to the journal under systemd (#7965)

Fixed

• Point to a manually created list of Zebra crates in docs (#8160)
• Add shielded-scan.md to the index (#8095)
• Elasticsearch feature, make bulk size the same for testnet and mainnet (#8127)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @bishopcheckmate, @gustavovalverde, @oxarbitrage, @sandakersmann, @teor2345 and @upbqdn

Zebra 1.5.0 - 2023-11-28

This release:

• fixes a panic that was introduced in Zebra v1.4.0, which happens in rare circumstances when reading cached sprout or history trees.
• further improves how Zebra recovers from network interruptions and prevents potential network hangs.
• limits the ability of synthetic nodes to spread throughout the network through Zebra to address some of the Ziggurat red team report.

As of this release, Zebra requires Rust 1.73 to build.

Finally, we've added an experimental "shielded-scan" feature and the zebra-scan crate as steps towards supporting shielded scanning in Zebra. This feature has known security issues. It is for experimental use only. Ongoing development is tracked in issue #7728.

Important Security Warning

Do not use regular or sensitive viewing keys with Zebra's experimental scanning feature. Do not use this feature on a shared machine. We suggest generating new keys for experimental use.

Security

• security(net): Stop sending peer addresses from version messages directly to the address book (#7977)
• security(net): Limit how many addresses are sent directly to the address book for a single peer address message (#7952)
• security(net): Rate-limit GetAddr responses to avoid sharing the entire address book over a short period (#7955)

Added

• feat(config): Add config field for the viewing keys used by zebra-scan (#7949)
• feat(scan): Add on-disk database to store keys and scan results (#7942, #8036)
• feat(scan): Spawn zebra-scan task from zebrad with configured viewing keys (#7989)
• feat(scan): Create a scan_block function to use across scanning tasks (#7994)
• feat(scan): Scan blocks with Sapling keys and write the results to the database (#8040)
• poc(scan): Proof of concept for shielded scanning (#7758)
• add(docker): Add ldb RocksDB query tool to the Dockerfile (#8074)

Changed

• change(state): Expose ZebraDb methods that can create different kinds of databases (#8002)
• change(state): Make the types for finalized blocks consistent (#7923)
• change(scan): Create a scanner storage database (#8031)
• change(scan): Store scanned TXIDs in "display order" (#8057)
• change(scan): Create a function that scans one block by height, and stores the results in the database (#8045)
• change(scan): Store one transaction ID per database row, to make queries easier (#8062)
• change(log): Silence verbose failed connection logs (#8072)

Fixed

• fix(db): Fix a sprout/history tree read panic in Zebra v1.4.0, which only happens before the 25.3.0 state upgrade completes (#7972)
• fix(net): Fix potential network hangs, and reduce code complexity (#7859)
• fix(scan): Start scanning task only if there are keys to scan (#8059)
• fix(rpc): Make the verbose argument of the getrawtransaction RPC optional (#8076)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @oxarbitrage, @teor2345 and @upbqdn

Zebra 1.4.0 - 2023-11-07

Zebra's mining RPCs are now available in release builds. Our Docker images are significantly smaller, because the smaller Zcash verification parameters are now built into the zebrad binary. Zebra has updated to the shared Rust dependencies from the zcashd 5.7.0 release.

Zebra recovers better from brief network interruptions, and avoids some network and verification denial of service and performance issues. We have restored our macOS tests in CI, and now support macOS on a best-effort basis.

We have changed our documentation website URL, and we are considering deprecating some Docker image tags in release 1.5.0 and later.

Deprecation Warnings

This release has the following deprecation warnings:

Warning: Deprecation of DockerHub Image Tags in a future release

Zebra currently publishes 11 DockerHub tags for each new release. We want to reduce the number of DockerHub tags we publish in a future minor Zebra release.

Based on usage and user feedback, we could stop publishing:

• The 1 tag, which updates each release until NU6
• The 1.x tag, which updates each patch release until the next minor release
• The 1.x.y tag, which is the same as v1.x.y
• The sha-xxxxxxx tag, which is the same as v1.x.y (for production releases)

We also want to standardise experimental image tags to -experimental, rather than .experimental.

So for release 1.5.0, we might only publish these tags:

• latest
• latest-experimental (a new tag)
• v1.5.0
• v1.5.0-experimental

Please let us know if you need any other tags by opening a GitHub ticket.

We recommend using the latest tag to always get the most recent Zebra release.

Warning: Documentation Website URL Change

We have replaced the API documentation on the doc.zebra.zfnd.org website with docs.rs. All links have been updated.

Zebra's API documentation can be found on:

• docs.rs, which renders documentation for the public API of the latest crate releases;
• doc-internal.zebra.zfnd.org, which renders documentation for the internal API on the main branch.

doc.zebra.zfnd.org stopped being updated a few days before this release, and it will soon be shut down.

Significant Changes

This release contains the following significant changes:

Mining RPCs in Production Builds

Zebra's mining RPCs are now available in release builds (#7740). Any Zebra instance can be used by a solo miner or mining pool. This stabilises 12 RPCs, including getblocktemplate, submitblock, getmininginfo, getnetworksolps, [z_]validateaddress and getblocksubsidy. For more information, read our mining blog post.

Please let us know if your mining pool needs extra RPC methods or fields.

Zcash Parameters in zebrad Binary

zebrad now bundles zk-SNARK parameters directly into its binary. This increases the binary size by a few megabytes, but reduces the size of the Docker image by around 600 MB because the parameters don't contain the Sprout proving key anymore. The zebrad download command does nothing, so it has been removed.

Previously, parameters were stored by default in these locations:

• ~/.zcash-params (on Linux); or
• ~/Library/Application Support/ZcashParams (on Mac); or
• C:\Users\Username\AppData\Roaming\ZcashParams (on Windows)

If you have upgraded zebrad to 1.4.0 or later, and zcashd to 5.7.0 or later, you can delete the parameter files in these directories to save approximately 700 MB disk space.

zcashd have deprecated their fetch-params.sh script, so it can't be used to retry failed downloads in zebrad 1.3.0 and earlier.

We recommend upgrading to the latest Zebra release to avoid download issues in new installs.

macOS Support

macOS x86_64 is now supported on a best-effort basis. macOS builds and some tests run in Zebra's CI.

Security

• Reconnect with peers after brief network interruption (#7853)
• Add outer timeouts for critical network operations to avoid hangs (#7869)
• Set iterator read bounds where possible in DiskDb, to avoid a known RocksDB denial of service issue (#7731, #7732)
• Fix concurrency issues in tree key formats, and CPU usage in genesis tree roots (#7392)

Removed

• Remove the zebrad download command, because it no longer does anything (#7819)

Added

• Enable mining RPCs by default in production builds (#7740)
• Re-enable macOS builds and tests in CI (#7834)
• Make macOS x86_64 a tier 2 supported platform in the docs (#7843)
• Add macOS M1 as a tier 3 supported platform (#7851)

Changed

• Build Sprout and Sapling parameters into the zebrad binary, so a download server isn't needed (#7800, #7844)
• Bump ECC dependencies for zcashd 5.7.0 (#7784)
• Refactor the installation instructions for the s-nomp mining pool software (#7835)

Fixed

• Make the latest Docker tag point to the production build, rather than the build with experimental features (#7817)
• Fix an incorrect consensus-critical ZIP 212 comment (#7774)
• Fix broken links to zebra_network and zebra_state Config structs on doc-internal.zebra.zfnd.org (#7838)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @gustavovalverde, @mpguerra, @oxarbitrage, @rex4539, @teor2345, @upbqdn, and @vuittont60.

Zebra 1.3.0 - 2023-10-16

This release adds RPC methods for the "Spend before Sync" light wallet feature, and fixes performance issues and bugs in the mining solution rate RPCs. Progress bars can now be enabled using a config, please help us test them!

It contains the following updates:

User Testing: Progress Bars

Zebra has progress bars! When progress bars are enabled, you can see Zebra's blocks, transactions, and peer connections in your terminal. We're asking Zebra users to test this feature, and give us feedback on the forums.

To show progress bars while running Zebra, add these lines to your zebrad.toml:

[tracing]
progress_bar = "summary"

For more details, including a known issue with time estimates, read our progress bars blog post.

Security

• Fix database concurrency bugs that could have led to panics or incorrect history tree data (#7590, #7663)

Added

• Zebra's progress bars can now be enabled using a zebrad.toml config (#7615)
• Add missing elasticsearch flag feature to lib docs (#7568)
• Add missing Docker variables and examples (#7552)
• Check database format is valid on startup and shutdown (#7566, #7606). We expect to catch almost all database validity errors in CI (#7602, #7627), so users are unlikely to see them on startup or shutdown.

Spend before Sync Support

• Add state requests and support code for the z_getsubtreesbyindex RPC (#7408, #7734)
• Implement the z_getsubtreesbyindex RPC (#7436)
• Test the z_getsubtreesbyindex RPC (#7515, #7521, #7566, #7514, #7628)
• Format subtree roots in little-endian order (#7466)
• Add note subtree indexes for new and existing blocks (#7437)
• Upgrade subtrees from the tip backwards, for compatibility with wallet syncing (#7531)
• Handle a subtree comparison edge case correctly (#7587)

Changed

• Return errors instead of panicking in methods for Heights (#7591)
• Update tests for compatibility with the ECC's lightwalletd fork (#7349)

Fixed

• Refactor docs for feature flags (#7567)
• Match zcashd's getblockchaininfo capitalisation for NU5 (#7454)
• Fix bugs and performance of getnetworksolps & getnetworkhashps RPCs (#7647)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @gustavovalverde, @oxarbitrage, @rex4539, @teor2345 and @upbqdn.

Zebra 1.2.0 - 2023-09-01

Highlights

This release:

• Starts our work implementing "spend before sync" algorithm for lightwalletd.
• Contains an automatic database upgrade that reduces the size of Zebra's current cached state from approximately 276GB to 244GB. It does so by automatically pruning unneeded note commitment trees from an existing cache. New Zebra instances will also build their cache without these trees.

Breaking Changes

zebrad 1.2.0 cached states are incompatible with previous zebrad versions:

• zebrad 1.2.0 upgrades the cached state format. The new format is incompatible with previous zebrad versions. After upgrading to this Zebra version, don't downgrade to an earlier version.
• When earlier versions try to use states upgraded by zebrad 1.2.0:
  • zebrad versions 1.0.0 and 1.0.1 will respond to some z_gettreestate RPC requests with incorrect empty final_state fields
  • pre-release zebrad versions can panic when verifying shielded transactions, updating the state, or responding to RPC requests

Changed

• Deduplicate note commitment trees stored in the finalized state (#7312, #7379)
• Insert only the first tree in each series of identical trees into finalized state (#7266)
• Our testing framework now uses the ECC lightwalletd fork (#7307). This was needed to start the work of implementing fast spendability. The ECC repo is now the supported implementation in Zebra, documentation was changed to reflect this. (#7427)

Added

• Documentation for mining with Docker (#7179)
• Note tree sizes field to getblock RPC method (#7278)
• Note commitment subtree types to zebra-chain (#7371)
• Note subtree index handling to zebra-state, but we're not writing subtrees to the finalized state yet (#7334)

Fixed

• Log a warning instead of panicking for unused mining configs (#7290)
• Avoid expensive note commitment tree root recalculations in eq() methods (#7386)
• Use the correct state version for databases without a state version file (#7385)
• Avoid temporary failures verifying the first non-finalized block or attempting to fork the chain before the final checkpoint (#6810)
• If a database format change is cancelled, also cancel the format check, and don't mark the database as upgraded (#7442)

Zebra 1.1.0 - 2023-07-18

This release adds new mempool metrics, fixes panics when cancelling tasks on shutdown, detects subcommand name typos on the command-line, and improves the usability of Zebra's Docker images (particularly for mining).

Breaking Changes

• Zebra now detects subcommand name typos on the command-line. If you want to give Zebra a list of tracing filters, use zebrad start --filters debug,... (#7056)

Security

• Avoid initiating outbound handshakes with IPs for which Zebra already has an active peer (#7029)
• Rate-limit inbound connections per IP (#7041)

Added

• Metrics tracking mempool actions and size bucketed by weight (#7019) by @str4d
• Legacy state format compatibility layer and version bumps for ECC dependencies to match zcashd 5.6.0 (#7053)
• Framework for upcoming in-place database format upgrades (#7031)

Changed

• Deduplicate note commitment trees in non-finalized state (#7218, #7239)

Fixed

• Enable miners running Zebra with Docker to set their address for mining rewards (#7178)
• Use default RPC port when running Zebra with Docker (#7177, #7162)
• Stop panicking on async task cancellation on shutdown in network and state futures (#7219)
• Remove redundant startup logs, fix progress bar number, order, and wording (#7087)
• Organize Docker ENV and ARG values based on their usage (#7200)
• Avoid blocking threads by awaiting proof verification results from rayon in async context (#6887)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @gustavovalverde, @mpguerra, @oxarbitrage, @str4d, @teor2345 and @upbqdn

Zebra 1.0.1 - 2023-07-03

Zebra's first patch release fixes multiple peer connection security issues and panics. It also significantly reduces Zebra's CPU usage. We recommend that all users upgrade to Zebra 1.0.1 or later.

As of this release, Zebra requires Rust 1.70 to build. macOS builds are no longer officially supported by the Zebra team.

If you're running zebrad in a terminal, you'll see a new Zebra welcome message.

Please report bugs to the Zebra GitHub repository

Breaking Changes

This release has the following breaking changes:

• Zebra limits each IP address to 1 peer connection, to prevent denial of service attacks. This can be changed using the network.max_connections_per_ip config. (#6980, #6993, #7013). Thank you to @dimxy from komodo for reporting this bug, and the Ziggurat team for demonstrating its impact on testnet.
• Zebra uses new APIs in Rust 1.70 to prevent concurrency bugs that could cause hangs or panics (#7032).

Support Changes

These platforms are no longer supported by the Zebra team:

• macOS has been moved from tier 2 to tier 3 support (#6965). We disabled our regular macOS builds because Rust 1.70 causes crashes during shutdown on macOS x86_64 (#6812). Zebra's state uses database transactions, so it should not be corrupted by the crash.

Security

• Use Arc::into_inner() to avoid potential hangs or panics (#7032)
• Replace openssl with rustls in tests and experimental features (#7047)

Network Security

• Fix long delays in accepting inbound handshakes, and delays in async operations throughout Zebra. (#7103). Thank you to the Ziggurat Team for reporting this bug.
• Limit each IP address to 1 peer connection, to prevent denial of service attacks. (#6980, #6993)
• Close new peer connections from the same IP and port, rather than replacing the older connection (#6980)
• Reduce inbound service overloads and add a timeout (#6950)
• Stop panicking when handling inbound connection handshakes (#6984)
• Stop panicking on shutdown in the syncer and network (#7104)

Added

• Make the maximum number of connections per IP configurable (#7013)
• Make it easier to modify Zebra's config inside the Docker image (#7045)
• Print a Zebra logo and welcome text if stderr is terminal (#6945, #7075, #7095, #7102)

Changed

• Move macOS to tier 3 support (#6965)
• Install from crates.io in the README, rather than a git release tag (#6977)
• Add extra timeout logging to peer TCP connections (#6969)

Fixed

• Stop overwriting custom user configs inside Zebra's Docker image (#7045)
• Stop Zebra using 100% CPU even when idle (#7103), thank you to james_katz for reporting this bug
• Avoid potential hangs in the tokio async runtime (#7094)
• Replace or add RPC content type header to support zcashd RPC examples (#6885)
• Make zebra-network licensing clearer (#6995)

Configuration

• Ignore error from loading config if running the 'generate' or 'download' commands (#7014)
• Apply force_color to panic logs (#6997)

Logging & Error Handling

• Log a zebra-network task cancel on shutdown, rather than panicking (#7078)
• Fix incorrect function spans in some logs (#6923, #6995)
• Replace a state validation chain length assertion with a NotReadyToBeCommitted error (#7072)

Experimental Feature Fixes

• Add an elasticsearch feature to block serialize to fix experimental build failures (#6709)
• Prevent progress bar from panicking by disabling limits that are never reached (#6940)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @conradoplg, @dconnolly, @dimxy from komodo, james_katz, @oxarbitrage, @teor2345, @upbqdn, and the Ziggurat team.

Zebra 1.0.0 - 2023-06-14

This is our 1.0.0 stable release.

This release also fixes a panic at startup when parsing the app version, publishes zebrad to crates.io, and publishes to Docker Hub under the latest tag.

Please report bugs to the Zebra GitHub repository

Security

• Avoid potential concurrency bugs in outbound handshakes (#6869)

Changed

• Publish to crates.io (#6908)
• Rename tower-batch to tower-batch-control (#6907)
• Upgrade to ed25519-zebra 4.0.0 (#6881)

Fixed

• Stop panicking at startup when parsing the app version (#6888)
• Avoid a race condition in testing modified JoinSplits (#6921)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @dconnolly, @gustavovalverde, @oxarbitrage, @teor2345 and @upbqdn

Zebra 1.0.0-rc.9 - 2023-06-07

This release continues to address audit findings. It fixes multiple network protocol and RPC bugs, and reduces sensitive information logging.

This is the last release candidate before the 1.0.0 stable release. Please report bugs to the Zebra GitHub repository

Breaking Changes

• The version subcommand has been replaced with a --version/-V flag (#6801)

Security

• Stop logging peer IP addresses, to protect user privacy (#6662)
• Stop logging potentially sensitive user information from unmined transactions (#6616)
• Rate-limit MetaAddrChange::Responded from peers (#6738)
• Ignore out of order Address Book changes, unless they are concurrent (#6717)
• Limit blocks and transactions sent in response to a single request (#6679)
• Rate-limit and size-limit peer transaction ID messages (#6625)
• Stop panicking on state RPC or block requests with very large heights (#6699)
• Try harder to drop connections when they shut down, Credit: Ziggurat Team (#6832)
• Randomly drop connections when inbound service is overloaded (#6790)

Added

• Report compiler version and Zebra features when starting Zebra (#6606)
• Update Zebra book summary to include supported platforms, platform tier policy, and versioning (#6683)
• Improve zebrad's help output, credit to @Rqnsom (#6801)
• Cache a list of useful peers on disk (#6739)
• Make the first stable release forward-compatible with planned state changes (#6813)

Fixed

• Limit RPC failure log length, add details to RPC failure logs (#6754)
• Allow inbound connections to Zebra running in Docker (#6755)
• Zebra now accepts filters for the start command when no subcommand is provided (#6801)
• Avoid panicking on state errors during shutdown (#6828)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @mpguerra, @oxarbitrage, @teor2345 and @upbqdn

Zebra 1.0.0-rc.8 - 2023-05-10

Starting in this release, Zebra has implemented an "end of support" halt. Just like zcashd, the zebrad binary will stop running 16 weeks after the last release date. Also, this release adds the ZIP-317 rules to mempool transactions which should help with the Zcash network spam issue.

Security

• Avoid inbound service overloads and fix failing tests (#6537)
• Avoid a rare panic when a connection is dropped (#6566)
• Avoid some self-connection nonce removal attacks (#6410)
• Reject nodes using ZClassic ports, and warn if configured with those ports (#6567)

Added

• Add ZIP-317 rules to mempool (#6556)
• Add user agent argument to zebra-network crate (#6601)
• Refuse to run zebrad when release is too old (#6351)

Fixed

• Handle randomness generation and invalid random values as errors in cryptographic code (#6385)
• When configured for testnet, automatically use the correct testnet listener port (#6575)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @gustavovalverde, @oxarbitrage, @teor2345 and @upbqdn

Zebra 1.0.0-rc.7 - 2023-04-18

This release features a security fix for unbounded memory use in zebra-network, introduces the "progress-bar" feature, and continues to address audit findings.

Security

• Limit the number of leftover nonces in the self-connection nonce set (#6534)
• Allow each initial peer to send one inbound request before disconnecting any peers (#6520)
• Limit the number of non-finalized chains tracked by Zebra (#6447)
• Update dependencies that only appear in the lock file (#6217)

Added

• Add confirmations to getrawtransaction method response (#6287)
• Add a config for writing logs to a file (#6449)
• Add an experimental terminal-based progress bar feature to Zebra, which is off by default (#6235)
• Create DockerHub image with mining enabled after each Zebra release (#6228)

Changed

• Increase ZIP-401 mempool cost thresholds for Orchard transactions (#6521)
• Suggest making sure the RPC endpoint is enabled for checkpointing (#6375)
• Refactor the handling of height differences (#6330)
• Upgrade shared dependencies to match zcashd 5.5.0 (#6536)
• Lookup unspent UTXOs in non-finalized state before checking disk (#6513)
• Stop re-downloading blocks that are in non-finalized side chains (#6335)

Fixed

• Validate header versions when serializing blocks (#6475)
• Stop ignoring new transactions after the mempool is newly activated (#6448)
• Fix off-by-one error in DNS seed peer retries, and clarify logs (#6460)
• Check that mempool transactions are valid for the state's chain info in getblocktemplate (#6416)
• Remove transactions with immature transparent coinbase spends from the mempool and block templates (#6510)
• Disable issue URLs for a known shutdown panic in abscissa (#6486)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @dconnolly, @gustavovalverde, @oxarbitrage, @teor2345 and @upbqdn

Zebra 1.0.0-rc.6 - 2023-03-23

In this release, we fixed several minor security issues, most notably hardening Zebra in response to the vulnerabilities recently disclosed by Halborn.

Known Issues

• orchard 0.3.0 can't verify halo2 proofs when compiled with Rust 1.69 or later (currently beta and nightly Rust). Compile Zebra with stable Rust to avoid this bug. (halo2/#737). Zebra tracking issue for this problem is #6232.

Security

• Harden Zebra's network protocol implementation in response to the Halborn disclosures (#6297)
• Bump incrementalmerkletree from 0.3.0 to 0.3.1, resolving a consensus bug on 32-bit platforms (#6258)
• Remove unused dependencies, and check for them in CI (#6216)
• Validate address length before reading (#6320, #6368)

Added

• Add instructions for mining with s-nomp to Zebra book (#6220)
• Export block data to elasticsearch database (#6274)
• Add elasticsearch section to Zebra book (#6295)

Changed

• Update Zebra's build instructions (#6273)
• Improve CommitBlockError message (#6251)

Fixed

• Stop ignoring some transaction broadcasts (#6230)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @dconnolly, @mpguerra, @oxarbitrage, @teor2345 and @upbqdn

Zebra 1.0.0-rc.5 - 2023-02-23

This release:

• finishes the implementation of mining-related RPCs;
• makes Zebra ready for testing and initial adoption by mining pools;
• adds support for the latest version of lightwalletd;
• makes non-finalized chain forks instant;
• contains other improvements such as deduplication of RedPallas code.

Zebra now also checks that it is following the consensus chain each time it starts up.

Security

• Check that Zebra's state contains the consensus chain each time it starts up. This implements the "settled network upgrade" consensus rule using all of Zebra's checkpoints (#6163).

  User action required:

  • If your config is based on an old version of Zebra, or you have manually edited it, make sure consensus.checkpoint_sync = true. This option has been true by default since March 2022.

• Bump hyper from 0.14.23 to 0.14.24, fixing a denial of service risk (#6094)

• Re-verify transactions that were verified at a different tip height (#6154)

• Fix minute-long delays in block verification after a chain fork (#6122)

Deprecated

• The consensus.checkpoint_sync config in zebrad.toml is deprecated. It might be ignored or removed in a future release. (#6163)

Added

• Log a cute message for blocks that were mined by Zebra (off by default) (#6098)
• Add extra getblock RPC fields used by some mining pools (#6097)
• Get details from transaction differences in getrawmempool RPC (#6035)

New RPCs

• Implement the z_listunifiedreceivers RPC (#6171)
• Implement the getblocksubsidy RPC (#6032)
• Implement the validateaddress RPC (#6086)
• Implement the z_validateaddress RPC (#6185)
• Implement the getdifficulty RPC (#6099)

Documentation

• Add detailed testnet mining docs to the Zebra repository (#6201)
• Add mining instructions to the zebra book (#6199)

Changed

• Use reddsa crate and remove duplicated RedPallas code (#6013)
• Upgrade to the zcash_primitives 0.10 API (#6087)
• Simplify getdifficulty RPC implementation (#6105)

Fixed

• Change error format in proposals (#6044)
• Fix lightwalletd instructions to be compatible with Zebra (#6088)
• Downgrade owo-colors from 3.6.0 to 3.5.0 (#6203)
• Make RPC "incorrect parameters" error code match zcashd (#6066)
• Make the verbosity argument optional in the getblock RPC (#6092)
• Increase legacy chain limit to 100,000 (#6053)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @conradoplg, @gustavovalverde, @jackgavigan, @oxarbitrage, @sandakersmann, @teor2345 and @upbqdn

Zebra 1.0.0-rc.4 - 2023-01-30

In this release we fixed bugs and inconsistencies between zcashd and zebrad in the output of the getblocktemplate RPC method. In addition, we added block proposal mode to the getblocktemplate RPC, while we continue the effort of adding and testing mining pool RPC methods.

Security

• Verify the lock times of mempool transactions. Previously, Zebra was ignoring mempool transaction lock times, but checking them in mined blocks. Credit to DeckerSU for reporting this issue. (#6027)
• Bump bumpalo from 3.8.0 to 3.12.0, removing undefined behaviour on wasm targets. These targets are not supported Zebra platforms. (#6015)
• Bump libgit2-sys from 0.14.0+1.5.0 to 0.14.2+1.5.1, to ensure that SSH server keys are checked. Zebra only uses libgit2 during builds, and we don't make SSH connections. (#6014)
• Bump tokio from 1.24.1 to 1.24.2, to fix unsoundness. The unsound methods are not directly used by Zebra. (#5995)

Added

• Add getpeerinfo RPC method (#5951)
• Add proposal capability to getblocktemplate (#5870)
• Add a test to check that the Docker image config works (#5968)
• Make zebra-checkpoints work for zebrad backend (#5894, #5961)
• Add test dependency from zebra-rpc to zebra-network with correct features (#5992)
• Document zebra download command (#5901)

Fixed

• Return detailed errors to the RPC client when a block proposal fails (#5993)
• Avoid selecting duplicate transactions in block templates (#6006)
• Calculate getblocktemplate RPC testnet min and max times correctly (#5925)
• Fix Merkle root transaction order in getblocktemplate RPC method (#5953)

Changed

• Strings in zebra configuration file now use double quotes, caused by upgrading the toml crate. Old configs will still work #6029

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @conradoplg, @gustavovalverde, @mpguerra, @oxarbitrage and @teor2345

Zebra 1.0.0-rc.3 - 2023-01-10

This release continues our work on mining pool RPCs, and brings Zebra up to date with the latest ZIP-317 changes. It also fixes a minor network protocol compatibility bug.

As part of this release, we upgraded tokio to fix potential hangs and performance issues. We encourage all users to upgrade to the latest Zebra version to benefit from these fixes.

Breaking Changes

• Zebra now requires at least Rust 1.65, because we have started using new language features. Any Zebra release can increase the required Rust version: only the latest stable Rust version is supported.

Security

• Upgrade tokio from 1.22.0 to 1.23.0 to fix potential hangs and performance issues (#5802)
• Refactor block subsidy to handle Height::MAX without panicking (#5787)
• Update ZIP-317 transaction selection algorithm in the getblocktemplate RPC (#5776)

Added

• Add the getmininginfo, getnetworksolps and getnetworkhashps RPC methods (#5808)
• Add long polling support to the getblocktemplate RPC (#5772, #5796, #5837, #5843, #5862)
• Populate blockcommitmenthash and defaultroot fields in the getblocktemplate RPC (#5751)
• Support transparent p2pkh miner addresses in the getblocktemplate RPC (#5827)

Changed

• Automatically re-verify mempool transactions after a chain fork, rather than re-downloading them all (#5841)
• Try to match zcashd's getblocktemplate exactly (#5867)
• Accept a hash or a height as the first parameter of the getblock RPC (#5861)
• Wait for 3 minutes to check Zebra is synced to the tip, rather than 2 (#5840)
• Update mainnet and testnet checkpoints (#5928)

Fixed

• Allow peers to omit the relay flag in version messages (#5835)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @dconnolly, @dependabot[bot], @oxarbitrage and @teor2345

Zebra 1.0.0-rc.2 - 2022-12-06

Zebra's latest release continues work on mining pool RPCs, fixes a rare RPC crash that could lead to memory corruption, and uses the ZIP-317 conventional fee for mempool size limits.

Zebra's consensus rules, node sync, and lightwalletd RPCs are ready for user testing and experimental use. Zebra has not been audited yet.

Breaking Changes

This release has the following breaking changes:

• Evict transactions from the mempool using the ZIP-317 conventional fee (#5703)
  • If there are a lot of unmined transactions on the Zcash network, and Zebra's mempool becomes full, Zebra will penalise transactions that don't pay at least the ZIP-317 conventional fee. These transactions will be more likely to get evicted.
  • The ZIP-317 convention fee increases based on the number of logical transparent or shielded actions in a transaction.
  • This change has no impact under normal network conditions.

Security

• Fix a rare crash and memory errors when Zebra's RPC server shuts down (#5591)
• Evict transactions from the mempool using the ZIP-317 conventional fee (#5703)

Added

• Add submitblock RPC method (#5526)
• Add a mining section with miner address to config (#5491)

Changed

• Select getblocktemplate RPC transactions according to ZIP-317 (#5724)
• Add transaction fields to the getblocktemplate RPC (#5496 and #5508)
• Populate some getblocktemplate RPC block header fields using the state best chain tip (#5659)
• Return an error from getblocktemplate method if Zebra is not synced to network tip (#5623)
• Implement coinbase conversion to RPC TransactionTemplate type (#5554)
• Check block and transaction Sprout anchors in parallel (#5742)
• Contextually validates mempool transactions in best chain (#5716 and #5616)
• Generate coinbase transactions in the getblocktemplate RPC (#5580)
• Log loaded config path when Zebra starts up (#5733)
• Update mainnet and testnet checkpoints on 2022-12-01 (#5754)
• Bump zcash_proofs from 0.8.0 to 0.9.0 and zcash_primitives from 0.8.1 to 0.9.0 (#5631)

Fixed

• Check network and P2SH addresses for mining config and funding streams(#5620)
• Return an error instead of panicking in the batch verifier on shutdown (#5530)
• Use a more reliable release template branch name and docker command (#5519)
• Make the syncer ignore some new block verification errors (#5537)
• Pause new downloads when Zebra reaches the lookahead limit (#5561)
• Shut down the RPC server properly when Zebra shuts down (#5591)
• Print usage info for --help flag (#5634)
• Fix RPC bugs (#5761)
• Clarify inbound and outbound port requirements (#5584)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @oxarbitrage, @teor2345, and @mpguerra

Zebra 1.0.0-rc.1 - 2022-11-02

This is the second Zebra release candidate. Zebra's consensus rules, node sync, and lightwalletd RPCs are ready for user testing and experimental use. Zebra has not been audited yet.

This release starts work on mining pool RPCs, including some mempool fixes. It also restores support for Rust 1.64.

Breaking Changes

This release has the following breaking changes:

• Remove unused buggy cryptographic code from zebra-chain (#5464, #5476). This code was never used in production, and it had known bugs. Anyone using it should migrate to librustzcash instead.

Added

• Introduce getblocktemplate-rpcs feature (#5357)
  • Add getblockcount rpc method (#5357)
  • Add getblockhash rpc method (#4967)
  • Add getblocktemplate rpc call with stub fields (#5462)
• Add block commit task metrics (#5327)
• Document how we tag and release Zebra (#5392)
• Document how to use Zebra with Docker (#5504)

Changed

• Update mainnet and testnet checkpoints (#5512)

Fixed

• Reject mempool transactions with spent outpoints or nullifiers (#5434)
• Allow extra lookahead blocks in the verifier, state, and block commit task queues. This reduces the number of downloaded blocks that are dropped due to the lookahead limit. (#5465)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @gustavovalverde, @oxarbitrage, @teor2345 and @upbqdn

Zebra 1.0.0-rc.0 - 2022-10-12

This is the first Zebra release candidate. Zebra's consensus rules, node sync, and lightwalletd RPCs are ready for user testing and experimental use. Zebra has not been audited yet.

This release also makes significant performance improvements to RPCs, and temporarily removes support for Rust 1.64.

Breaking Changes

This release has the following breaking changes:

• Rust 1.64 is unsupported due to a performance regression when downloading the Zcash parameters. Zebra currently builds with Rust 1.63 (#5251).
• Use correct TOML syntax in Docker zebrad.toml (#5320)

Major RPC Performance Improvements

This release improves RPC performance:

• Initial lightwalletd sync is about twice as fast (#5307)
• RPCs can run while a block is being committed to the state, previously they could be delayed by 5-15 seconds (#5134, #5257)

Security

• Make default command work in docker images, disable optional listener ports (#5313)
• Update yanked versions of cpufeatures (orchard/aes), ed25519 (tor), and quick-xml (flamegraph) (#5308)
• Bump rand_core from 0.6.3 to 0.6.4, fixes unsoundness bug (#5175)

Changed

• Log git metadata and platform info when zebrad starts up (#5200)
• Update mainnet and testnet checkpoints (#5360)
• Update README for the release candidate (#5314)
• change(docs): Add links to CI/CD docs in the zebra book's sidebar (#5355)

Fixed

• Use correct TOML syntax in Docker zebrad.toml (#5320)
• Look back up to 10,000 blocks on testnet for a legacy chain (#5133)

Performance

• Build zebrad with Rust 1.63 to avoid Zcash parameter download hangs (#5251)
• Write blocks to the state in a separate thread, to avoid network and RPC hangs (#5134, #5257)
• Fix slow getblock RPC (verbose=1) using transaction ID index (#5307)
• Open the database in a blocking tokio thread, which allows tokio to run other tasks (#5228)

Contributors

Thank you to everyone who contributed to this release, we couldn't make Zebra without you: @arya2, @gustavovalverde, @oxarbitrage, @teor2345 and @upbqdn.

Zebra 1.0.0-beta.15 - 2022-09-20

This release improves Zebra's sync and RPC performance, improves test coverage and reliability, and starts creating Docker Hub binaries for releases.

It also changes some of zebra-network's unstable Rust APIs to provide more peer metadata.

Breaking Changes

This release has the following breaking changes:

• Zebra's JSON-RPC server has an isolated thread pool, which is single threaded by default (#4806). Multi-threaded RPCs disable port conflict detection, allowing multiple Zebra instances to share the same RPC port (#5013). To activate multi-threaded RPC server requests, add this config to your zebrad.toml:

[rpc]
parallel_cpu_threads = 0

• Docker users can now specify a custom zebrad config file path (#5163, #5177). As part of this feature, the default config path in the Docker image was changed.

• zebrad now uses a non-blocking tracing logger (#5032). If the log buffer fills up, Zebra will discard any additional logs. Moving logging to a separate thread also changes the timing of some logs, this is unlikely to affect most users.

• Zebra's gRPC tests need protoc installed (#5009). If you are running Zebra's lightwalletd gRPC test suite, see the tonic README for details.

Added

Releasing Zebra

• Create Docker hub binaries when tagging releases (#5138)
• Document how Zebra is versioned and released (#4917, #5026)
• Allow manual Release Drafter workflow runs (#5165)

Network Peer Rust APIs

Note: Zebra's Rust APIs are unstable, they are not covered by semantic versioning.

• Return peer metadata from connect_isolated functions (#4870)

Testing

• Check that the latest Zebra version can parse previous configs (#5112)
• Test disabled lightwalletd mempool gRPCs via zebrad logs (#5016)

Documentation

• Document why Zebra does a UTXO check that looks redundant (#5106)
• Document how Zebra CI works (#5038, #5080, #5100, #5105, #5017)

Changed

Zebra JSON-RPCs

• Breaking: Add a config for multi-threaded RPC server requests (#5013)
• Isolate RPC queries from the rest of Zebra, to improve performance (#4806)

Zebra State

• Send treestates from non-finalized state to finalized state, rather than re-calculating them (#4721)
• Run StateService read requests without shared mutable chain state (#5132, #5107)
• Move the finalized block queue to the StateService (#5152)
• Simplify StateService request processing and metrics tracking (#5137)

Block Checkpoints

• Update Zebra checkpoints (#5130)

Docker Images

• Breaking: Allow Docker users to specify a custom zebrad config file path (#5163, #5177)

Continuous Integration and Deployment

• Wait 1 day before creating cached state image updates (#5088)
• Delete cached state images older than 2 days, but keep a few recent images (#5113, #5124, #5082, #5079)
• Simplify GitHub actions caches (#5104)
• Use 200GB disks for managed instances (#5084)
• Improve test reliability and test output readability (#5014)

Zebra Dependencies

• Breaking: Update prost, tonic, tonic-build and console-subscriber to the latest versions (#5009)
• Upgrade zcash\_script and other shared zcash dependencies (#4926)
• Update deny.toml developer docs and file comments (#5151, #5070)
• Update other Zebra Rust dependencies to the latest versions (#5150, #5160, #5176, #5149, #5136, #5135, #5118, #5009, #5074, #5071, #5037, #5020, #4914, #5057, #5058, #5047, #4984, #5021, #4998, #4916, #5022, #4912, #5018, #5019)

CI Dependencies

• Update Zebra CI dependencies to the latest versions (#5159, #5148, #5117, #5073, #5029)

Removed

Continuous Integration

• Disable beta Rust tests (#5090, #5024)

Fixed

Logging

• Breaking: Switch zebrad to a non-blocking tracing logger (#5032)

Testing

• Increase full sync timeout to 32 hours (#5172, #5129)
• Disable unreliable RPC port conflict tests on Windows and macOS (#5072)
• Increase slow code log thresholds to reduce verbose logs and warnings (#4997)

Continuous Integration

• Fix full sync CI failures by adding an extra GitHub job (#5166)
• Make checkpoint disk image names short enough for Google Cloud (#5128)
• Label lightwalletd cached state images with their sync height (#5086)

Lints

• Fix various Rust clippy lints (#5131, #5045)
• Fix a failure in tj-actions/changed-files on push (#5097)

Documentation

• Enable all cargo features in Zebra's deployed documentation (#5156)

Security

JSON-RPC Server

• Isolate RPC queries from the rest of Zebra, so that lightwalletd clients are more isolated from each other (#4806)

Zebra 1.0.0-beta.14 - 2022-08-30

This release contains a variety of CI fixes, test fixes and dependency updates. It contains two breaking changes:

• the recommended disk capacity for Zebra is now 300 GB, and the recommended network bandwidth is 100 GB per month, and
• when no command is provided on the command line, zebrad automatically starts syncing (like zcashd).

The sync performance of lightwalletd is also improved.

Added

• Store history trees by height in the non-finalized state (#4928)
• Breaking: Add start as default subcommand for zebrad (#4957)

Changed

• Fix a performance regression when serving blocks via the Zcash network protocol and RPCs (#4933)
• Update block hash checkpoints for mainnet (#4919, #4972)
• Enable a tinyvec feature to speed up compilation (#4796)
• Split the zebra_state::service::read module (#4827)
• Disallow Orchard ivk = 0 on IncomingViewingKey::from & SpendingKey generation (#3962)

Docs

• Increase disk and network requirements for long-term deployment (#4948, #4963)
• Update supported Rust versions in README.md (#4938)
• Document edge cases in sync workflows (#4973)
• Add missing status badges & sections (#4817)

Rust Dependencies

• Bump serde from 1.0.137 to 1.0.144 (#4865, #4876, #4925)
• Bump serde_json from 1.0.81 to 1.0.83 (#4727, #4877)
• Bump serde_with from 1.14.0 to 2.0.0 (#4785)
• Bump futures from 0.3.21 to 0.3.23 (#4913)
• Bump futures-core from 0.3.21 to 0.3.23 (#4915)
• Bump chrono from 0.4.19 to 0.4.20 (#4898)
• Bump criterion from 0.3.5 to 0.3.6 (#4761)
• Bump thiserror from 1.0.31 to 1.0.32 (#4878)
• Bump vergen from 7.2.1 to 7.3.2 (#4890)
• Bump tinyvec from 1.5.1 to 1.6.0 (#4888)
• Bump insta from 1.15.0 to 1.17.1 (#4884)
• Bump semver from 1.0.12 to 1.0.13 (#4879)
• Bump bytes from 1.1.0 to 1.2.1 (#4843)
• Bump tokio from 1.20.0 to 1.20.1 (#4864)
• Bump hyper from 0.14.19 to 0.14.20 (#4764)
• Bump once_cell from 1.12.0 to 1.13.0 (#4749)
• Bump regex from 1.5.6 to 1.6.0 (#4755)
• Bump inferno from 0.11.6 to 0.11.7 (#4829)

CI Dependencies

• Bump actions/github-script from 6.1.0 to 6.2.0 (#4986)
• Bump reviewdog/action-actionlint from 1.27.0 to 1.29.0 (#4923, #4987)
• Bump tj-actions/changed-files from 24 to 29.0.2 (#4936, #4959, #4985)
• Bump w9jds/firebase-action from 2.2.2 to 11.5.0 (#4905)
• Bump docker/build-push-action from 3.0.0 to 3.1.1 (#4797, #4895)

Fixed

• Increase the number of blocks checked for legacy transactions (#4804)

CI

• Split a long full sync job (#5001)
• Stop cancelling manual full syncs (#5000)
• Run a single CI workflow as required (#4981)
• Fix some clippy warnings (#4927, #4931)
• Improve Zebra acceptance test diagnostics (#4958)
• Expand cached state disks before running tests (#4962)
• Increase full sync timeouts for longer syncs (#4961)
• Fix a regular expression typo in a full sync job (#4950)
• Write cached state images after update syncs, and use the latest image from any commit (#4949)
• Increase CI disk size to 200GB (#4945)
• Make sure Rust tests actually run in deploy-gcp-tests.yml (#4710)
• Copy lightwalletd from the correct path during Docker builds (#4886)
• Use FHS for deployments and artifacts (#4786)
• Retry gcloud authentication if it fails (#4940)
• Disable beta Rust tests and add parameter download logging (#4930)
• Do not run versioning job when pushing to main (#4970)
• Deploy long running node instances on release (#4939)
• Run build and test jobs on cargo and clippy config changes (#4941)
• Increase Mergify batch sizes (#4947)

Networking

• Send height to peers (#4904)
• Fix handshake timing and error handling (#4772)

Tests

• Show full Zebra test panic details in CI logs (#4942)
• Update timeout for Zebra sync tests (#4918)
• Improve test reliability and performance (#4869)
• Use FuturesOrdered in fallback_verification test (#4867)
• Skip some RPC tests when ZEBRA_SKIP_NETWORK_TESTS is set (#4849)
• Truncate the number of transactions in send transaction test (#4848)

Zebra 1.0.0-beta.13 - 2022-07-29

This release fixes multiple bugs in proof and signature verification, which were causing big performance issues near the blockchain tip. It also improves Zebra's sync performance and reliability under heavy load.

Disk and Network Usage Changes

Zebra now uses around 50 - 100 GB of disk space, because many large transactions were recently added to the block chain. (In the longer term, several hundred GB are likely to be needed.)

When there are a lot of large user-generated transactions on the network, Zebra can upload or download 1 GB or more per day.

Configuration Changes

• Split the checkpoint and full verification sync concurrency options (#4726, #4758):
  • Add a new full_verify_concurrency_limit
  • Rename max_concurrent_block_requests to download_concurrency_limit
  • Rename lookahead_limit to checkpoint_verify_concurrency_limit For backwards compatibility, the old names are still accepted as aliases.
• Add a new parallel_cpu_threads sync concurrency option (#4776). This option sets the number of threads to use for CPU-bound tasks, such as proof and signature verification. By default, Zebra uses all available CPU cores.

Rust Compiler Bug Fixes

• The Rust team has recently fixed compilation bugs in function coercions of impl Trait return types, and async fn lifetimes. We recommend that you update your Rust compiler to release 1.62.1, and re-compile Zebra.

Added

• Add a rayon thread pool for CPU-bound tasks (#4776)
• Run multiple cryptographic batches concurrently within each verifier (#4776)
• Run deserialization of transaction in a rayon thread (#4801)
• Run CPU-intensive state updates in parallel rayon threads (#4802)
• Run CPU-intensive state reads in parallel rayon threads (#4805)
• Support Tiers and supported platforms per Tier doc (#4773)

Changed

• Update column family names to match Zebra's database design (#4639)
• Update Zebra's mainnet and testnet checkpoints (#4777, #4833)
• Process more blocks and batch items concurrently, so there's a batch ready for each available CPU (#4776)
• Wrap note commitment trees in an Arc, to reduce CPU and memory usage (#4757)
• Increment tokio dependency from 1.19.2 to 1.20.0, to improve diagnostics (#4780)

Fixed

• Only verify halo2 proofs once per transaction (#4752)
• Use a separate channel for each cryptographic batch, to avoid dropped batch results (#4750)
• Improve batch fairness and latency under heavy load (#4750, #4776)
• Run all verifier cryptography on blocking CPU-bound threads, using tokio and rayon (#4750, #4776)
• Use tokio's PollSemaphore, instead of an outdated Semaphore impl (#4750)
• Check batch worker tasks for panics and task termination (#4750, #4777)
• Limit the length of the reject network message's message and reason fields (#4687)
• Change the bitvec dependency from 1.0.0 to 1.0.1, to fix a performance regression (#4769)
• Fix an occasional panic when a zebra-network connection closes (#4782)
• Stop panicking when the connection error slot is not set (#4770)
• When writing blocks to disk, don't block other async tasks (#4199)
• When sending headers to peers, only deserialize the header data from disk (#4792)
• Return errors from send_periodic_heartbeats_with_shutdown_handle (#4756)
• Make FindHeaders and FindHashes run concurrently with state updates (#4826)
• Stop reading redundant blocks for every FindHashes and FindHeaders request (#4825)
• Generate sapling point outside the method (#4799)

CI

• Workaround lightwalletd hangs by waiting until we're near the tip (#4763)
• Split out Canopy logs into a separate job (#4730)
• Make full sync go all the way to the tip (#4709)
• Split Docker logs into sprout, other checkpoints, and full validation (#4704)
• Add a Zebra cached state update test, fix lightwalletd tests (#4813)

Zebra 1.0.0-beta.12 - 2022-06-29

This release improves Zebra's Orchard proof verification performance and sync performance. Zebra prefers to connect to peers on the canonical Zcash ports.

This release also contains some breaking changes which:

• improve usability, and
• make Zebra compile faster.

Breaking Changes

Cache Deletion

• Zebra deletes unused cached state directories in <OS-specific cache dir>/zebra (#4586) These caches only contain public chain data, so it is safe to delete them.

Compile-Time Features

• Most of Zebra's tracing and metrics features are off by default at compile time (#4539, #4680)
• The enable-sentry feature has been renamed to sentry (#4623)

Config

• Times in zebrad.config change from seconds/nanoseconds to a human-readable format. Remove times in the old format, or use zebrad generate to create a new config. (#4587)

Added

Diagnostics

• Show the current network upgrade in progress logs (#4694)
• Add some missing tracing spans (#4660)
• Add tokio-console support to zebrad (#4519, #4641)
• Add fallible_impl_from clippy lint (#4609)
• Add unwrap_in_result clippy lint (#4667)

Testing

• Check that old zebrad.toml configs can be parsed by the latest version (#4676)
• Test cargo doc warnings and errors (#4635, #4654)
• Document how to run full sync and lightwalletd tests (#4523)

Continuous Integration

• Add beta rust to CI (#4637, #4668)
• Build each Zebra crate individually (#4640)

Changed

Chain Sync

• Update mainnet and testnet checkpoint hashes (#4708)

Diagnostics

• Update transaction verification dashboard to show all shielded pool sigs, proofs, nullifiers (#4585)

Testing

• Add an identifiable suffix to zcash-rpc-diff temp directories (#4577)

Dependencies

• Managecargo-mdbook as a GitHub action (#4636)

Continuous Integration

• Automatically delete old GCP resources (#4598)

Documentation

• Improve the release checklist (#4568, #4595)

Removed

Continuous Integration

• Remove redundant build-chain-no-features job (#4656)

Fixed

Performance

• Upgrade halo2 and related dependencies to improve proof verification speed (#4699)
• Change default sync config to improve reliability (#4662, #4670, #4679)
• Fix a lookahead config panic (#4662)

Continuous Integration

• Actually create a cached state image after running a sync (#4669)
• Split docker run into launch, logs, and wait, to avoid GitHub job timeouts (#4675, #4690)
• Ignore lightwalletd test hangs for now (#4663)
• Disable zcash_rpc_conflict test on macOS (#4614)
• Use latest lightwalletd image for Zebra's Dockerfile (#4599)
• Increase lightwalletd timeout, remove testnet tests (#4584)

Documentation

• Fix various cargo doc warnings (#4561, #4611, #4627)
• Clarify how Zebra and zcashd interact in README.md (#4570)
• Improve lightwalletd tutorial (#4566)
• Simplify README and link to detailed documentation (#4680)

Diagnostics

• Resolve some lifetime and reference lints (#4578)

Security

• When connecting to peers, ignore invalid ports, and prefer canonical ports (#4564)

Zebra 1.0.0-beta.11 - 2022-06-03

This release cleans up a lot of tech dept accumulated in the previous development and improves the documentation.

Added

• Log the tracing level when it is set or reloaded (#4515)

CI

• Add a codespell linting action (#4482)
• Add grpc tests to CI (#4453)
• Require network names in cached state disk names (#4392)

RPC

• Add support for verbosity=1 in getblock (#4511)
• Add z_gettreestate gRPC tests (#4455)

Documentation

• Explain what Zebra does when it starts up (#4502)
• Add a lightwalletd tutorial (#4526)

Changed

• Immediately disconnect from pre-NU5 nodes (#4538)
• Upgrade tracing-subscriber and related dependencies (#4517)
• Disable debug logging at compile time in release builds (#4516)
• Activate the mempool after 2 syncer runs at the chain tip, rather than 4 (#4501)
• Run coverage on stable (#4465)
• Allow more time for tests to end gracefully (#4469)
• Do not create draft PRs if not needed (#4540)

Rust Dependencies

• Bump inferno from 0.11.3 to 0.11.4 (#4534)
• Bump insta from 1.14.0 to 1.14.1 (#4542)
• Bump log from 0.4.14 to 0.4.17 (#4530)
• Bump serde_with from 1.13.0 to 1.14.0 (#4532)
• Bump indexmap from 1.8.1 to 1.8.2 (#4531)
• Bump vergen from 7.1.0 to 7.2.0 (#4521)
• Bump prost from 0.10.3 to 0.10.4 (#4490)
• Bump regex from 1.5.5 to 1.5.6 (#4463)
• Bump once_cell from 1.11.0 to 1.12.0 (#4462)
• Bump once_cell from 1.10.0 to 1.11.0 (#4447)

CI Dependencies

• Bump tj-actions/changed-files from 20 to 21 (#4510)
• Bump google-github-actions/auth from 0.7.3 to 0.8.0 (#4478)
• Bump tj-actions/changed-files from 21 to 22 (#4541)
• Bump w9jds/firebase-action from 2.1.0 to 2.1.2 (#4431)
• Bump reviewdog/action-actionlint from 1.24.0 to 1.25.0 (#4432)
• Bump reviewdog/action-actionlint from 1.25.0 to 1.25.1 (#4479)

Fixed

• Index spending transaction IDs for each address (#4355)
• Resolve various clippy warnings (#4473)

Documentation

• Fix various doc warnings (#4514)
• Fix the syntax of links in comments (#4494)

CI

• Test RPCs with zcash/lightwalletd, to fix post-NU5 failures in adityapk00/lightwalletd (#4553)
• Add lightwalletd gRPC, clippy, rustfmt patch jobs (#4518)
• Permanently fix unreliable sync finished log regex (#4504)
• Always run patch jobs that depend on cached cloud disks (#4496)
• Temporarily finish full sync at 99% (#4457)
• Increase clippy timeout (#4472)
• Set a network env variable to be used in get-available-disks (#4477)
• Temporarily stop full sync at 97%, but send transactions at 100% (#4483)
• Mount the lwd-cache dir to the lightwalletd-full-sync (#4486)
• Require cached state for the send transactions test (#4487)
• Make reusable workflow job names match patch job names (#4466)
• Update docker patch jobs for recent changes (#4460)

Zebra 1.0.0-beta.10 - 2022-05-19

Zebra's latest beta continues adding support for lightwalletd RPC methods and continues with the testing of each of these features. Also, this beta sets the NU5 mainnet activation height.

Added

RPC

• z_gettreestate RPC (#3990)

Tests

• grpc test for GetTaddressBalanceStream and GetAddressUtxosStream (#4407)
• snapshot tests for RPC methods responses (#4352 #4401)

CI

• lightwalletd_update_sync test to CI (#4269)
• lightwalletd_full_sync test to CI (#4268)

Changed

• Set NU5 mainnet activation height and current network protocol version (#4390)
• NU5 mainnet dependency upgrades (#4405)
• Use the latest lightwalletd version (#4398)

Rust Dependencies

• orchard, redjubjub, jubjub, group, bls12_381, bitvec, halo2, jubjub, primitive_types, librustzcash, zcash_history, zcash_encoding, bellman, zcash_script, incrementalmerkletree (#4405)
• vergen from 7.0.0 to 7.1.0 (#4420)
• tokio-util from 0.7.1 to 0.7.2 (#4406)
• inferno from 0.11.2 to 0.11.3 (#4357)
• tokio from 1.18.1 to 1.18.2 (#4358)
• prost from 0.10.2 to 0.10.3 (#4348)
• bech32 from 0.8.1 to 0.9.0 (#4394)

CI Dependencies

• google-github-actions/auth from 0.7.1 to 0.7.3 (#4404 #4419)
• tj-actions/changed-files from 19 to 20 (#4403)
• w9jds/firebase-action from 2.0.0 to 2.1.0 (#4402)

Others

• Rename workflow files (#3941)
• Added block hash and height to syncer errors (#4287)
• Drop sentry dependencies when enable-sentry feature is disabled (#4372)
• Deprecate gcr.io as a registry and build faster (#4298)
• Clippy: Remove redundant bindings, allocations, and generics (#4353)

Documentation

• Added "old state directories aren't deleted" to known issues (#4365)
• Added support for Mermaid to render graphs (#4359)
• Fix some typos (#4397)

Fixed

RPC

• Use the Sapling activation height in gRPC tests (#4424)

State

• Return non-finalized UTXOs and tx IDs in address queries (#4356)
• List cached state files before or after tests (#4409)

CI and testing fixes

• Updated Cargo.lock check job name in patch workflow (#4428)
• Put gRPC tests behind an optional feature flag to fix production build issues (#4369)
• Stop failing the send transaction test (#4416)
• Require cached lightwalletd state for the send transaction tests (#4303)
• Errors in Docker entrypoint (#4411)
• Only use cached state disks with the same state version (#4391)
• Output length in some tests (#4387)
• Wrong file being referenced by CI (#4364)
• Make test selection and logging consistent (#4375)
• Allow builds over 1 hour and tests without the sentry feature (#4370)

Zebra 1.0.0-beta.9 - 2022-05-06

Zebra's latest beta continues our work on lightwalletd RPC methods, and contains some internal CI improvements.

Added

RPCs

• Add a script for comparing zcashd and zebrad RPC responses (#4219)
• Add Rust tests for lightwalletd sync from Zebra (#4177)
• Add integration test to send transactions using lightwalletd (#4068)
• RPC test with fully synced Zebra (#4157)
• Log unrecognized RPC requests (#3860)
• Implement the get_address_tx_ids RPC method query (#4119)
• Implement getaddressbalance RPC (#4138)
• Add a query function for transparent UTXOs (#4111)

CI

• Add sending_transactions_using_lightwalletd test to CI (#4267)
• Add a zebrad tip-height utility command (#4289)
• Add fully_synced_rpc_test test to CI (#4223)
• Add a reusable workflow for deployable integration tests (#4271)
• Add wallet grpc tests (#4253)
• Implement reusable workflows for image building (#4173)
• Implement getaddressutxos RPC method. (#4087)

Changed

• Increase block validation timeouts (#4156)
• Decrease the peer handshake timeout to 3 seconds, to speed up the initial sync (#4212)
• Use link-time optimisation in release builds (#4184)
• Add an extra block retry, to speed up the initial sync (#4185)
• Update Zebra's block hash checkpoints (#4183)
• Document coinbase rules, refactor to ease understanding (#4056)
• Disconnect from testnet peers using the first NU5 testnet rules (#3976)

RPCs

• Simplify RPC types and add documentation (#4218)

Documentation

• Add transaction index diagram to RFC-0005 (#4330)

CI

• Skip tests when doing a manual full sync (#4333)
• Add cached state version to disk images (#4314)
• Check specific files for each job when linting (#4311)
• Use debian for faster mounting and bump readiness time (#4276)
• Use docker instead of Konlet for GCP deployments in CI (#4252)
• Create a full sync disk to add the cached state inside (#4266)
• Increase the Zcash parameter fetch timeout (#4148)

Fixed

• Fix testnet syncer loop on large Orchard blocks (#4286)

RPCs

• Fix some RPC response formats to match zcashd (#4217)
• Make Zebra RPC compatible with the zcash-cli RPC client (#4215)
• Use a structure for parameters of getaddresstxids (#4264)

CI

• Only update cached states when needed (#4332)
• Run sync tests according to the right conditions (#4313)
• Stop actionlint from failing in main (#4317)
• Make the full sync tests cache state at /zebrad-cache (#4308)
• Avoid docker cache contamination and invalidation (#4254)
• Garbage collect instances no matter previous steps status (#4255)
• Do not delete instances from main branch on merge (#4206)
• Retry after docker log follow ssh failures (#4198)
• Share GitHub runner caches between branches (#4149)

Zebra 1.0.0-beta.8 - 2022-04-19

Zebra's latest beta completes our work on the NU5 consensus rules. It continues our work on lightwalletd RPC methods, and contains some internal CI improvements.

Added

RPCs

• Implement a retry queue for transactions sent via RPCs (#4015)
• Partially implement the getaddresstxids RPC method (#4062)

State

• Add a transparent address balance index (#3963)
• Add a transparent address UTXO index (#3999)
• Add a transparent address transaction index (#4038)
• Add transparent address indexes to the non-finalized state (#4022)
• Add a query function for transparent address balances (#4097)

CI

• Create cached state disk image after a successful full sync test (#3986)

Changed

NU5

• Update to new zcash_script V5 API (#3799)
• Update network protocol versions for the second NU5 activation on testnet (#3799)
• Update the consensus branch ID and the second NU5 testnet activation height (#3799)
• Bump database version to trigger testnet rollback (#3799)

State

• Store transactions in a separate database index, to improve query speed (#3934)
• Store UTXOs by transaction location rather than transaction hash (#3978)
• Stop storing redundant transparent output fields in the database (#3992)
• Use LZ4 compression for RocksDB (#4027)
• Use Ribbon filters for database index lookups (#4040)
• Tune state database file compaction configuration (#4045)

CI

• Put the state version in cached state disk names (#4073)
• Improve mergify merge throughput (#4094, #4120)
• Run cached state rebuilds in main branch (#4107)
• Use GitHub Branch Protection checks instead of Mergify (#4103, #4105)
• Lint and standardize the actions structure (#3940)

Rust Dependencies

• Update shared Zcash dependencies for the second NU5 activation on testnet (#3799)
• Disable unused rocksdb compression features (#4082)
• Bump rlimit from 0.7.0 to 0.8.3 (#4051)

CI Dependencies

• Bump docker/metadata-action from 3.6.2 to 3.7.0 (#4049)
• Bump google-github-actions/auth from 0.6.0 to 0.7.0 (#4050)
• Bump tj-actions/changed-files from 18.6 to 18.7 (#4065)
• Bump reviewdog/action-actionlint from 1.21.0 to 1.23.0 (#4099, #4125)
• Bump actions/checkout from 3.0.0 to 3.0.1 (#4126)

Fixed

CI

• Validate tests exit code after reading the container logs (#3968, #4069)
• Give enough time to zebra before reading logs (#4123)

Rust Clippy

• Ignore clippy drop warnings in tests (#4081)

Zebra 1.0.0-beta.7 - 2022-04-05

Zebra's latest beta fixes a cargo install build failure in the previous beta release. It also fixes a lightwalletd RPC bug, and improves test coverage.

Changed

Database and State

• Update database design to put ordered list values in RocksDB keys (#3997)
• Make transparent address index database design more consistent (#4019)

CI

• Do not invalidate cache between PRs (#3996)

Dependency Updates

• Bump hyper from 0.14.17 to 0.14.18 (#3946)
• Bump indexmap from 1.8.0 to 1.8.1 (#4003)
• Bump semver from 1.0.6 to 1.0.7 (#3982)
• Bump serde-big-array from 0.3.2 to 0.4.1 (#4004)

Test Dependency Updates

• Bump insta from 1.13.0 to 1.14.0 (#3980)
• Bump tokio-util from 0.7.0 to 0.7.1 (#3981)

CI Dependency Updates

• Bump tj-actions/changed-files from 18.4 to 18.6 (#4002)

Fixed

Build

• Fix a compilation error caused by a test-only method in production code (#4000)
• Add a job to ci.yml that does cargo install --locked --path ./zebrad/ zebrad (#3998)

RPC

• Tell lightwalletd to wait for missing blocks in the getblock RPC (#3977)

State

• Stop panicking when a state block commit fails (#4016)

Logging

• Log hashes as hex strings in block commitment errors (#4021)

Tests

• Check for accidental database incompatibilities in cached state tests (#4020)

Zebra 1.0.0-beta.6 - 2022-03-28

Zebra's latest beta adds RPC server support, including some of the RPC calls needed to become a lightwalletd back end. As part of the RPC changes, we made performance improvements to cached state access.

Added

RPC

• RPC server support (#3589 #3863)
• getinfo RPC method (#3660)
• sendrawtransaction RPC method (#3685 #3706)
• getbestblockhash RPC method (#3754 #3864)
• getblock RPC method (#3707)
• getrawmempool RPC method (#3851)
• getblockchaininfo RPC method (#3891)
• getrawtransactionRPC method (#3908)

Tests

• Basic RPC server tests (#3641 #3726 #3879)
• Lightwalletd integration test (#3619 #3627 #3628 #3859 #3824 #3758 #3903)
• Full sync test (#3582)

Documentation

• Document RPC methods (#3868)
• Document consensus rules from 4.6 Action Descriptions (#3549)

CI

• Add lightwaletd integration test build and CI pipeline (#3657 #3700 #3705)

Others

• Added TransactionsByMinedId to mempool (#3907)
• Added code owners and automatic review assignment to the repository (#3677 #3708 #3718)
• Validate ZIP-212 grace period blocks using checkpoints (#3889)
• Store Sapling and Orchard note commitment trees in finalized and non-finalized state (#3818)
• Get addresses from transparent outputs (#3802)
• Explain the different ways .txt files are usedin the CI (#3743)

Changed

The Zebra team made a huge refactor to the database storage and the state to serve RPC calls efficiently. The refactor is accompanied with extensive low level tests in the form of snapshots.

Database and State

• Tests: #3691 #3759 #3630
• Database: #3717 #3741 #3874 #3578 #3579 #3590 #3607 #3617
• State: #3778 #3810 #3846 #3847 #3870 #3865 #3866 #3811 #3826

CI

• Cleanup GCP instances on a single PR (#3766)
• Use OCI Image Format Specification for labels (#3728)
• Use improved OIDC for gcloud authentication (#3885)
• Use gcloud to search for cached disk state (#3775)

Dependency updates

• Remove an outdated dependabot ignore rule (#3719)
• Manually upgraded some dependencies (#3625)
• Replace unmantained multiset with mset (#3595)
• Update sha2 from 0.9.8 to 0.9.9 (#3585)
• Update semver from 1.0.5 to 1.0.6 (#3610)
• Update secp256k1 from 0.21.2 to 0.21.3 (#3632)
• Update insta from 1.12.0 to 1.13.0 (#3762)
• Update inferno from 0.10.12 to 0.11.1 (#3748 #3919)
• Update regex from 1.5.4 to 1.5.5 (#3797)
• Update google-github-actions/setup-gcloud from 0.5.1 to 0.6.0 (#3814)
• Update docker/login-action from 1.12.0 to 1.14.1 (#3570 #3761)
• Update actions/cache from 2 to 3 (#3918)
• Update tj-actions/changed-files from 14.4 to 18.4 (#3667 #3917 #3796 #3895 #3876)
• Update docker/build-push-action from 2.9.0 to 2.10.0 (#3878)
• Update once_cell from 1.9.0 to 1.10.0 (#3747)
• Update actions/checkout from 2.4.0 to 3.0.0 (#3806)
• Update owo-colors from 3.2.0 to 3.3.0 (#3920)
• Update vergen from 6.0.2 to 7.0.0 (#3837)

Documentation

• Simplify the database design using prefix iterators (#3916)
• Link to Conventional Commits specification in CONTRIBUTING file (#3858)
• Update database design for read-only state service (#3843)
• Explain optional zebra-network/tor dependencies (#3765)
• Simplify zebra-checkpoints summary (#3612)

Tests

• Turn on full backtraces and disable frame filtering (#3763)
• Decouple full sync from other tests (#3735)
• Split zebrad acceptance tests into sub-modules (#3901)
• Improve zebrad test API (#3899 #3892)

Others

• Move mempool request and response types to a new zebra-node-services crate (#3648)
• Enable checkpoint_sync by default (#3777)
• Update Zebra's hard-coded blockchain checkpoint lists (#3606)
• Clippy lints: warn on manual printing to stdout or stderr (#3767)

Removed

• Temporally removed Windows support from CI (#3819)

Fixed

• Make FromHex consistent with ToHex for tx/block hashes (#3893)
• Prevent synchronizer loop when very close to tip (#3854)
• Use RwLock for note commitment tree root caches (#3809)

Tests

• Use the correct stop condition for the cached state tests (#3688)
• Stop excessive logging which causes test hangs (#3755)
• Use all available checkpoints in the full sync test (#3613)
• Use TEST_FAKE_ACTIVATION_HEIGHTS at runtime and fix tests (#3749)
• Check for zebrad test output in the correct order (#3643)

CI

• Do not use GHA cache for images (#3794)
• Run coverage collection when pushing to main (#3561)
• Check for duplicate dependencies with optional features off (#3592)
• Remove coverage from mergify because nightly builds fail (#3886)
• Only run the full sync test on mergify queue PRs (#3773)
• Fix syntax in some yml workflows (#3957)
• Update CI job path triggers (#3692)
• Change pd-extreme to pd-ssd to avoid quotas (#3823)
• Use a specific shortening length for SHAs (#3929)
• Path format for cached state rebuild (#3873)
• Re-enable manual dispatch for test full sync (#3812)
• Use correct conditional in job to deploy Mainnet nodes (#3750)
• Missing job key and timeout bump for build (#3744)

Security

• Forbid non-ascii identifiers (#3615)

Zebra 1.0.0-beta.5 - 2022-02-18

Zebra's latest beta brings better networking, documents more consensus rules and improves the CI pipelines.

Added

• Estimate network chain tip height based on local node time and current best tip (#3492)
• Add extra integer lints, and partially fix some code (#3409)
• Prepare for changes in ZIP-244 (#3415, #3446)
• Support large block heights (#3401)
• Check coinbase data is at least 2 bytes long (#3542)
• Ignore non-verack and non-version messages in handshake (#3522)
• Allow forcing zebrad to use color output (#3547)

Tests

• Add a test for peerset broadcast panic (#3470)
• Add PeerSet readiness and request future cancel-safety tests (#3252)
• Add full chain synchronization acceptance tests (#3543)
• Add chain tip estimate test: log chain progress while Zebra is syncing (#3495)

Networking

• Avoid repeated requests to peers after partial responses or errors (#3505)
• Send notfound when Zebra doesn't have a block or transaction (#3466)
• Route peer requests based on missing inventory (#3465)
• Create an API for a missing inventory registry, but don't register any missing inventory yet (#3255)

Documentation

• Document consensus rules from 7.3 Spend Description Encoding and Consensus (#3575)
• Document second part of consensus rules from 7.6 Block Header Encoding and Consensus (#3566)
• Document consensus rules from 3.9 Nullifier Sets (#3521)
• Update README goals and performance troubleshooting (#3525)
• Document consensus rules from 4.5 Output Descriptions (#3462)
• Document shielded pools consensus rules from 7.1.2 Transaction Consensus Rules (#3486)
• Document Transaction encodings: sprout fields (#3499)
• Document Transaction encodings: transparent fields (#3498)
• Document Transaction encodings: orchard fields (#3507)
• Document Transaction encodings: sapling fields (#3501)
• Document Transaction encodings: header fields (#3491)
• Document consensus rules from 4.4 Spend Descriptions (#3460)
• Document consensus rules from 4.3 JoinSplit Descriptions (#3452)
• Document Transaction consensus rules: Size rules (#3461)
• Document Transaction consensus rules: Coinbase rules (#3464)
• Document Transaction consensus rules: Header rules (#3456)

Changed

• Reduce log level of components (#3418, #3437)
• Change Type To Force Consensus Rule Validation (#3544)
• Split The Database Module (#3568)
• Dockerize Tests And Run Sync In Detached Mode (#3459)
• Improve Docker And Gcloud Usage Without Cloud Build (#3431)
• Make better use of variables, secrets and versions (#3393)

Removed

• Remove founders reward code (#3430)

Fixed

• Use the new increase_nofile_limit function from rlimit 0.7.0 (#3539)
• Generate Well-Formed Finalsaplingroot In Arbitrary Implementation (#3573)
• Rename some lightwalletd database types (#3567)

Networking

• Allow more inbound than outbound connections (#3527)
• Only send responded updates on handshake/ping/pong (#3463)
• Increase state concurrency and syncer lookahead (#3455)
• Add a send timeout to outbound peer messages (#3417)

Tests

• Make Full Sync Test More Accurate (#3555)
• Create Disk From Image Before Mounting (#3550)
• Simplify Resource Conflict Test To Avoid Ci Failures (#3537)
• Make Full Sync Test More Efficient (#3562)
• Evaluate "if" conditions correctly and use last disk SHA (#3556)

CI

• Improve test requirements and merge conditions for Mergify (#3580)
• Make The Purpose Of Each Sync Test Clearer (#3574)
• Delete A Redundant "Test All" Job (#3552)
• Allow Branches With Dots In The Name (#3557)
• Allow Unprivileged Runs Of Clippy (#3558)
• New Lints In Nightly Rust (#3541)
• Typo In Paths Filtering Keyword (#3516)
• Do Not Wait For Deprecated Cloud Build (#3509)
• Restrict Merges With Unresolved Threads (#3453)
• Put PRs With No Priority Label In The Low Priority Queue (#3454)
• Temporarily allow forked repos to run PR workflows (#3503)

Zebra 1.0.0-beta.4 - 2022-01-26

Zebra's latest beta improves the networking code and fixes some bugs. A couple of fixed bugs had caused Zebra to hang in some situations. Some improvements to the documentation were also included. All Rust crates have now been updated to use Rust 2021 Edition.

Added

• Add a copy-state zebrad command, which copies blocks between two state services (#3175)

Networking

• Add isolated Tor connection API, but don't enable it by default (#3303)
• Add a test for message broadcast to the right number of peers (#3284)

Changed

• Update to use Rust edition 2021 (#3332)

Networking

• Cache incoming unsolicited address messages, and use them as responses (#3294)
• Cleanup internal network request handler, fix unused request logging (#3295)

Documentation

• Document the consensus rules for Spend Transfers, Output Transfers, and their Descriptions (Section 3.6 of the Zcash protocol specification) (#3338)
• Document the structure of the zebra-network crate (#3317)
• Document the consensus rules for Note Commitment Trees (Section 3.8 of the Zcash Protocol Specification) (#3319)
• Document chain value balances consensus rules with new format (#3286)
• Document part of the block header consensus rules (#3296)

Fixed

Consensus

• Fix interstitial sprout anchors check (#3283)
• Check jubjub key correctness independent of redjubjub / jubjub (#3154)

Networking

• Fix some bugs related to isolated connections (#3302)
• Ignore unexpected block responses to fix error cascade when synchronizing blocks, improving synchronization speed (#3374)
• Cancel heartbeats that are waiting for a peer, rather than hanging Zebra (#3325)
• Stop ignoring some peers when updating the address book (#3292)
• Fix some address crawler timing issues (#3293)
• Retry Zcash sprout and sapling parameters download (#3306)
• Keep track of background peer tasks (#3253)

Chain Synchronization

• Fix deadlock in chain tip watch channel, that sometimes caused chain synchronization to hang (#3378)
• Fix syncer download order and add sync tests (#3168)

Tests

• Fix a type resolution error in the tests (#3304)

Security

• Stop RocksDB and Tokio from calling unexpected code when zebrad exits (#3392)

Zebra 1.0.0-beta.3 - 2021-12-21

Zebra's latest beta works towards enforcing all consensus rules by validating JoinSplit Groth16 proofs used by Sprout transactions. We have also added security and network improvements, and have also added some metrics to help diagnose networking issues.

Added

Consensus

• Validate JoinSplit proofs (#3128, #3180)

Networking

• Add and use debug_skip_parameter_preload config option in tests (#3197)
• Disconnect from outdated peers on network upgrade (#3108)

Metrics

• Add diagnostics for peer set hangs (#3203)
• Add debug-level Zebra network message tracing (#3170)

Fixed

• Stop ignoring some connection errors that could make the peer set hang (#3200)
• Spawn initial handshakes in separate tasks, Credit: Equilibrium (#3189)
• Fix coinbase height deserialization to reject non-minimal encodings (#3129)
• Stop doing thousands of time checks each time we connect to a peer (#3106)

Security

• Stop ignoring panics in inbound handshakes (#3192)
• When there are no new peers, stop crawler using CPU and writing logs (#3177)
• Limit address book size to limit memory usage (#3162)
• Drop blocks that are a long way ahead of the tip, or behind the finalized tip (#3167)

Zebra 1.0.0-beta.2 - 2021-12-03

Zebra's latest beta continues implementing zero-knowledge proof and note commitment tree validation. In this release, we have finished implementing transaction header, transaction amount, and Zebra-specific NU5 validation. (NU5 mainnet validation is waiting on an orchard crate update, and some consensus parameter updates.)

We also fix a number of security issues that could pose a local denial of service risk, or make it easier for an attacker to make a node follow a false chain.

As of this release, Zebra will automatically download and cache the Sprout and Sapling Groth16 circuit parameters. The cache uses around 1 GB of disk space. These cached parameters are shared across all Zebra and zcashd instances run by the same user.

Added

Network Upgrade 5

• Validate orchard anchors (#3084)

Groth16 Circuit Parameters

• Automatically download and cache Zcash Sapling and Sprout parameters (#3057, #3085)
• Stop linking the Sapling parameters into the zebrad and Zebra test executables (#3057)

Proof & Anchor Verification

• Use prepared verifying key for non-batch Sapling Groth16 verification (#3092)
• Validate sapling anchors⚓ (#3084)
• Add Sprout anchors to zebra-state (#3100)

Transaction Amount & Header Validation

• Validate miner transaction fees (#3067, #3093)
• Validate transaction lock times (#3060)
• Validate transaction expiry height (#3082, #3103)

Dashboards

• Add transaction-verification.json Grafana dashboard (#3122)

Fixed

• Shut down channels and tasks on PeerSet Drop (#3078)
• Re-order Zebra startup, so slow services are launched last (#3091)
• Fix slow Zebra startup times, to reduce CI failures (#3104)
• Speed up CI, and split unrelated and conflicting CI jobs (#3077)

Security

• Stop closing connections on unexpected messages, Credit: Equilibrium (#3120, #3131)
• Stop routing inventory requests by peer address (#3090)

Zebra 1.0.0-beta.1 - 2021-11-19

Zebra's latest beta implements a number of consensus rules which will be needed for Zebra to fully validate all of the Zcash network consensus rules, including those which will activate with NU5.

With this release we are also fixing a number of security issues that could pose a DDoS risk or otherwise negatively impact other nodes on the network.

Finally, this release includes an upgrade to the latest version of tokio (1.14.0).

Added

• Check Shielded Input and Output Limits (#3069, #3076)
• Sprout note commitment trees (#3051)
• Check per-block limits on transparent signature operations (#3049)
• Calculate Block Subsidy and Funding Streams (#3017, #3040)
• Check for duplicate crate dependencies in CI (#2986)
• Add unused seed peers to the Address Book (#2974, #3019)

Network Upgrade 5

• Verify Halo2 proofs as part of V5 transaction verification (#2645, #3039)
• ZIP-155: Parse addrv2 in Zebra (#3008, #3014, #3020, #3021, #3022, #3032)
• ZIP 212: validate Sapling and Orchard output of coinbase transactions (#3029)
• Validate Orchard flags in v5 (#3035)

Documentation

• Mempool Documentation (#2978)

Changed

• Upgrade cryptographic library dependencies (#3059)
• Upgrade to Tokio 1.14.0 (#2933, #2994, #3062)

Documentation

• README Updates (#2996, #3006)

Fixed

• Stop downloading unnecessary blocks in Zebra acceptance tests (#3072)
• Implement graceful shutdown for the peer set (#3071)
• Check for panics in the address book updater task (#3064)
• Remove unused connection errors (#3054)
• Fix listener address conflicts in network tests (#3031)

Security

• Security: Avoid reconnecting to peers that are likely unreachable (#3030)
• Security: Limit number of addresses sent to peers to avoid address book pollution (#3007)

Zebra 1.0.0-beta.0 - 2021-10-29

This is the first beta release of Zebra. Today the mempool work is fully finished and compatible with ZIP-401 and several security issues in the network stack are fixed. In addition to that we improved our documentation specially in the zebrad crate while we increased our test coverage. Finally, we get started with the task of upgrading Tokio to version 1.

Added

Mempool

• ZIP-401: weighted random mempool eviction (#2889, #2932)
• Reject a mempool transaction if it has internal spend conflicts (#2843)
• Limit transaction size in the mempool (#2917)

Cleanup and performance

• Remove unused mempool errors (#2941)
• Simplify calling add_initial_peers (#2945)
• Disable the new clippy::question_mark lint (#2946)
• Downgrade startup logs to debug to speed up CI (#2938)
• Speed up alternative state and zebrad tests in CI (#2929)

Tests

• Restore and update mempool tests (#2966)
• Test multiple chain resets (#2897)

Security

• Track the number of active inbound and outbound peer connections so we can implement limits (#2912)
• Limit the number of initial peers (#2913)
• Rate-limit initial seed peer connections (#2943)
• Limit the number of inbound peer connections (#2961)
• Rate limit inbound connections (#2928)
• Limit the number of outbound peer connections (#2944)
• Reduce outgoing peers demand (#2969)

Documentation

• Improve main README documentation and other book sections (#2967, #2894)
• Expand documentation for the mempool::crawler module (#2968)
• Improve mempool documentation (#2942, #2963, #2964, #2965)
• Improve documentation and types in the PeerSet (#2925)
• Update the documentation for value pools (#2919)
• Document why CheckForVerifiedTransactions is required for correctness (#2955)

Metrics

• Add user agent metrics (#2957)

Changed

Part of the Tokio version 1 upgrade:

• Manually pin Sleep futures (#2914)
• Refactor handshake rate limiting to not store a Sleep type (#2915)
• Use single thread Tokio runtime for tests (#2916)

Zebra 1.0.0-alpha.19 - 2021-10-19

Zebra's latest alpha updates dependencies, improves metrics, gossips verified blocks and transactions, and continues the mempool-related implementation.

Added

• Ignore AlreadyInChain error in the syncer (#2890)
• Give more information to the user in the wrong port init warning (#2853)
• Send looked up UTXOs to the transaction verifier (#2849)
• Return the transaction fee from the transaction verifier (#2876)
• Gossip recently verified block hashes to peers (#2729)
• Compute the serialized transaction size of unmined transactions (#2824)

Mempool

• Add a queue checker task, to make sure mempool transactions propagate (#2888)
• Store the transaction fee in the mempool storage (#2885)
• Add a debug config that enables the mempool (#2862)
• Pass the mempool config to the mempool (#2861)
• Add expired transactions to the mempool rejected list (#2852)
• Send AdvertiseTransactionIds to peers (#2823)
• Add a mempool config section (#2845)
• Add transactions that failed verification to the mempool rejected list (#2821)
• Un-reject mempool transactions if the rejection depends on the current tip (#2844)
• Split storage errors by match type: TXID or WTXID (#2833)
• Remove transactions in newly committed blocks from the mempool (#2827)

Documentation

• Improve the template for release versioning (#2906)
• Improve the documentation for the mempool transaction downloader (#2879)
• Add the documentation for the mempool storage and gossip modules (#2884)

Network Upgrade 5

• Set the minimum testnet network protocol version to NU5 (#2851)

Testing and CI

• Add some additional checks to the acceptance mempool test (#2880)

Metrics

• Refactor and add some new mempool metrics (#2878)
• Improve logging for initial peer connections (#2896)
• Always zero the mempool metrics when the mempool is disabled (#2875)
• Add a basic mempool storage Grafana dashboard (#2866)
• Add zcash.mempool.size.transactions and zcash.mempool.size.bytes metrics (#2860)
• Make some grafana labels shorter for graph readability (#2850)
• Make block metrics more accurate (#2835)

Changed

Mempool

• Avoid broadcasting mempool rejected or expired transactions to peers (#2858)
• Encapsulate some mempool functions with the Mempool type (#2872)
• Remove duplicate IDs in mempool requests and responses (#2887)
• Refactor mempool spend conflict checks to increase performance (#2826)
• Rename mempool storage methods by match type (#2841)
• Remove unused mempool errors (#2831)

Fixed

• Fix synchronization delay issue (#2921)
• Fix test failures by flushing output streams before exiting Zebra (#2911, #2923)
• Increase Zebra's restart acceptance test timeout (#2910)
• Avoid spurious acceptance test failures by decreasing the peer crawler timeout (#2905)
• Cancel pending download tasks when the mempool is disabled (#2886)
• Stop allowing some newly mined transactions into the mempool (#2874)
• Stop panicking when pruning unused queued blocks (#2842)

Security

• Upgrade to ed25519-zebra 3.0.0 (#2864)
• Stop ignoring the mempool conflicting transaction reject list size limit (#2855)

Zebra 1.0.0-alpha.18 - 2021-10-05

Zebra's latest alpha updates dependencies, consensus parameters, and Orchard for NU5 testnet activation. It continues our work on the mempool, including some mempool features that are used during network upgrade activation.

Added

Mempool

• Send crawled transaction IDs to the mempool downloader (#2801)
• Cancel mempool download tasks when a network upgrade activates (#2816)
• Send mined transaction IDs to the mempool download/verify task for cancellation (#2786)
• Remove expired transactions from the mempool (#2774)
• Cancel download and verify tasks when the mempool is deactivated (#2764, #2754)
• Reject mempool transactions with conflicting spends (#2765)
• Clear mempool at a network upgrade (#2773, #2785)

Network Upgrade 5

• Update Zebra's advertised network protocol version to the latest NU5 testnet version (#2803)

Testing and CI

• Add tests to ensure mempool is working correctly (#2769, #2770, #2815)
• Create and use a helper MockService type to help with writing tests (#2810, #2748, #2790)
• Update Zebra tests to use the NU5 testnet activation height (#2802)
• Regenerate NU5 test cases with the latest network upgrade parameters (#2802)

Metrics

• Add Zebra metrics and a Grafana dashboard for connected peers and their network protocol versions (#2804, #2811)

Changed

• Stop sending empty network messages to peers (#2791)
• Correctly validate transactions which never expire (#2782)

Network Upgrade 5

• Update zcash_script dependency to support V5 transactions (#2825)
• Set the NU5 testnet activation network upgrade parameters (#2802)
• Update shared Zcash Rust NU5 dependencies (#2739)
• Update Zebra to use modified APIs in shared Zcash Rust NU5 dependencies (#2739)

Fixed

• Stop panicking when using sync and async methods on the same ChainTipChange (#2800)
• Fix an incorrect assertion when the block locator is at the tip (#2789)
• Fix a missing NULL pointer check in zebra_script's FFI (#2802)

Security

Network Upgrade 5

• Update Zebra's orchard commitment calculations based on the latest orchard circuit (#2807)

Zebra 1.0.0-alpha.17 - 2021-09-14

Zebra's latest alpha continues work on the mempool.

Added

• Monitor changes to the chain tip, decide if synchronization reached tip (#2695, #2685, #2686, #2715, #2721, #2722)
• Only enable the mempool crawler after synchronization reaches the chain tip (#2667)
• Reply to requests for transactions IDs in the mempool (#2720)
• Reply to requests for transactions in the mempool, given their IDs (#2725)
• Download and verify gossiped transactions (#2679, #2727, #2718, #2741)
• Internal additions and improvements to the mempool (#2742, #2747, #2749)

Documentation

• Document consensus rules for version group IDs (#2719)
• Specify Zebra Client will only support Unified Addresses (#2706)

Fixed

• Stop calculating transaction hashes twice in the checkpoint verifier (#2696)

Security

• Replace older duplicate queued checkpoint blocks with the latest block's data (#2697)

Zebra 1.0.0-alpha.16 - 2021-08-27

Zebra's latest alpha finishes most of the state work needed for NU5 testnet activation and starts the mempool work.

Added

Network Upgrade 5

• Finished ZIP-209: Prohibit Negative Shielded Chain Value Pool Balances (#2599, #2649, #2656, #2648, #2644)
• ZIP-221 and ZIP-244: Commitment validation in non-finalized state and checkpoint verifier (#2609, #2633)
• Orchard binding_verification_key support (#2441)

Mempool

• Mempool component, storage and errors (#2615, #2651)
• Create a transaction crawler for the mempool (#2646, #2672)
• Create and use types for unmined transactions and their IDs (#2634, #2666)
• ZIP-239: Implement mempool transaction v5 data structures and network messages (#2618, #2638)
• Return a transaction verifier from zebra_consensus::init (#2665)
• Provide recent syncer response lengths as a watch channel (#2602)
• Derive Copy and Clone for zebra-consensus errors (#2664)
• ChainTip trait creation and usage (#2677, #2676)

Metrics

• Add a network message to the grafana dashboard (#2673)

Documentation

• Refactor Zebra metrics docs (#2678, #2687)

Fixed

• Stop converting Message::Inv(TxId+) into Request::TransactionsById (#2660)
• Fixed test.yml (#2635)
• Fixed a clippy lint (#2642)

Zebra 1.0.0-alpha.15 - 2021-08-16

Zebra's latest alpha contains the last of the changes to zebra chain state ahead of NU5 testnet activation and before concentrating on mempool work. The remaining NU5 validation will be completed prior to NU5 mainnet activation.

Added

• Reject connections from outdated peers after network upgrade activation (#2519)

Network Upgrade 5

• ZIP-209: Prohibit Negative Shielded Chain Value Pool Balances Partial Implementation (#2546, #2554, #2561, #2569, #2576, #2577, #2578, #2596)
• ZIP-221: FlyClient - Consensus-Layer Changes Partial Implementation (#2531, #2553, #2583)
• ZIP-244: Implementation of authorizing data commitment (auth_digest) (#2547)
• Check remaining transaction value is non-negative (#2566)

Changed

• Cache note commitment tree roots to speed up chain synchronisation (#2584)
• Update state cache version to v9 (#2598)
• Refactor HistoryTree type into NonEmptyHistoryTree and HistoryTree types (#2582)

Testing and CI

• Reduce number of nullifier property test cases (#2574)
• Ensure regenerate-stateful-test-disks.yml syncs to the latest network upgrade (#2601)
• Increase coverage for generated chains and proptests (#2540, #2567)
• Remove unreliable tests for generated chains (#2548)
• Add test-only methods for modifying orchard shielded data and joinsplits (#2580)
• Generate test chains with valid chain value pools (#2597)
• Increase timeout of cached database creation (#2581)
• Use fixed genesis coinbase data in generated genesis blocks (#2568)
• Generate valid sapling shielded data for property tests (#2579)
• Optimize build to regenerate the test state faster (#2552)

Fixed

• Fix the storage of anchors in the state (#2563)
• Make zebra-state compile successfully by itself (#2611)

Documentation

• Fix Transparent Value sign and definition (#2555)

Zebra 1.0.0-alpha.14 - 2021-07-29

Zebra's latest alpha continues our work on NU5, including Orchard and Transaction V5.

Added

• Reject UTXO double spends (#2511)
• Add a ValueBalance type (#2505)
• Implement Sum for Amount (#2500)
• Add an OrderedUtxo type for transparent spend validation (#2502)
• Pass the finalized state to chain contextual validation (#2503)
• Calculate incremental note commitment trees (#2407)
• Reject duplicate Sapling and Orchard nullifiers (#2497)
• Add proptest-impl feature to zebra-state crate to help simplify tests(#2529)
• Track anchors and note commitment trees (#2458)
• Validate spends of transparent coinbase outputs (#2525)
• Calculate the remaining value in the transparent transaction value pool (#2486)

Documentation

• Add value pools design to book summary (#2520)

Testing

• Test consensus-critical Amount deserialization (#2487)
• Update to use new GitHub action names in Google Cloud workflows (#2533)
• Add test initialization helper function for tests (#2539)

Changed

• Decrease the number of randomised test cases in zebra-state (#2521, #2513)
• Make nullifier tests consistent with UTXO tests (#2513)

Testing

• Disable Rust beta tests in CI, due to a Rust bug (#2542)

Fixed

• Clarify a variable name and check for overflow in new_ordered_outputs (#2510)
• Update Orchard keys, hashes, and note commitments to match Zcash test vectors (#2445)

Zebra 1.0.0-alpha.13 - 2021-07-15

Zebra's latest alpha continues our work on NU5, including Orchard and Transaction V5. New validation rules were implemented for transactions, preventing double spends in the Sprout pool, checking Sapling spends in V5 transactions, and some initial work to validate parts of Orchard transactions.

Added

• Reject duplicate sprout nullifiers in the state (#2477)
• Add methods for getting block nullifiers (#2465)
• Verify orchard spend auth (#2442)
• Parse and ignore MSG_WTX inventory type in network messages (part of ZIP-239) (#2446)
• Add ZIP-244 signature hash support (#2165)
• Add HistoryTree struct (#2396)
• Add ZIP-0244 TxId Digest support (#2129)
• Validate V5 transactions with Sapling shielded data (#2437)

Documentation

• Document some consensus-critical finalized state behaviour (#2476)
• Value pools design (#2430)

Changed

• Move Utxo type to zebra-chain (#2481)
• Combine near-duplicate Utxo creation functions (#2467)

Documentation

• Update state RFC for incremental trees, value pools, and RocksDB (#2456)
• Modify UTXO and state designs for transparent coinbase output checks (#2413)

Fixed

• When a parent block is rejected, also reject its children (#2479)
• Restore the previous non-finalized chain if a block is invalid (#2478)
• Stop ignoring sapling binding signature errors (#2472)
• Always compute sighash with librustzcash (#2469)
• Fix bug in sighash calculation for coinbase transactions (#2459)
• Increase coverage of cached state tests: full block and transaction validation, and non-finalized state validation (#2463)

Security

Zebra 1.0.0-alpha.12 - 2021-07-02

Zebra's latest alpha continues our work on NU5, including Orchard and Transaction V5. It also includes documentation updates and security fixes. In particular, Zebra no longer gossips unreachable addresses to other nodes and users should update and restart any running Zebra nodes.

Added

• Check if a previous version of Zebra followed a different consensus branch (#2366)
• API for a minimum protocol version during initial block download (#2395)
• Add a verification height to mempool transaction verification requests (#2400)
• Improved error messages by adding database path method to the Finalized State (#2349)
• Add property test strategies for V5 transactions (#2347)
• Re-use a shared Tokio runtime for some Zebra tests (#2397)

Documentation

• Add CHANGELOG.md file to the zebra git repo (#2346)
• Client RFC updates (#2367, #2341)
• Explain how Zebra validates shielded coinbase outputs like other shielded outputs (#2382)
• Document required request timeouts due to data dependencies (#2337)
• Update known issues and add inbound network ports to the README (#2373)
• Document shared to per-spend anchor conversion (#2363)
• Document note commitment trees storage (#2259)

Network Upgrade 5

• Orchard note commitment tree test vectors (#2384)
• Enable V5 transaction test vectors in the groth16 tests (#2383)
• Validate transparent inputs and outputs in V5 transactions (#2302)
• Batch math & variable-time multiscalar multiplication for RedPallas (#2288)
• Implement asynchronous verifier service for RedPallas (#2318)
• ZIP-211: Validate Disabling Addition of New Value to the Sprout Value Pool (#2399)

Changed

• Various transaction verifier refactors (#2371, #2432)
• Remove unicode in Zebra's user agent (#2376)
• Update multiple crates to ensure bitvec 0.22.3 is being used (#2351)
• Move transaction consensus branch ID check function to zebra-chain (#2354)
• Replace primitives_types with uint (#2350)
• Refactor to return errors from state update methods to prepare for contextual validation (#2417)
• Refactor of the validation of Sapling shielded data (#2419)

Network Upgrade 5

• Update spend and output checks for new Orchard consensus rules (#2398)

Fixed

• Failed tests in the cached state CI workflow are no longer ignored (#2403)
• Stop skipping the cached sync tests in CI (#2402)
• Fix intermittent errors in the groth16 verifier tests (#2412)
• Skip IPv6 tests when ZEBRA_SKIP_IPV6_TESTS environmental variable is set (#2405)
• Stop failing after the mandatory Canopy checkpoint due to incorrect coinbase script verification (#2404)
• Improved docs and panic messages for zebra_test::command (#2406)
• Gossip dynamic local listener ports to peers (#2277)
• Stop allowing JoinSplits for Halo (#2428)
• Fix failing legacy chain tests (#2427)

Security

• Zebra no longer gossips unreachable addresses to other nodes (#2392)
  • User Action Required: Update and restart any running Zebra nodes
• Avoid duplicate peer connections (#2276)
• Send local listener address to peers (#2276)
• Limit reconnection rate to individual peers (#2275)

Zebra 1.0.0-alpha.11 - 2021-06-18

Zebra's latest alpha continues our work on NU5, including Orchard and Transaction V5. It also includes some security fixes.

Added

• Add and use a function for the mandatory checkpoint for a given Network (#2314)

Network Upgrade 5

• ZIP-221: integrate MMR tree from librustcash (without Orchard) (#2227)

Changed

• Replace usage of atomics with tokio::sync::watch in tests for CandidateSet (#2272)

Network Upgrade 5

• Use latest librustzcash version in zcash_history (#2332, #2345)

Testing and Diagnostics

• Refactor restart_stop_at_height test to make it more flexible (#2315)
• Use Swatinem/rust-cache@v1 (#2291)
• Replace bespoke source-based coverage config with cargo-llvm-cov (#2286)
• Remove outdated pinned nightly in coverage workflow (#2264)

Fixed

Network Upgrade 5

• Stop panicking on invalid orchard nullifiers (#2267)
• Reject V5 transactions before NU5 activation (#2285)

Testing

• Make acceptance test zebrad output matching more robust (#2252)

Security

• Stop gossiping failure and attempt times as last seen times (#2273)
• Return an error rather than panicking on invalid reserved orchard::Flags bits (#2284)
• Only apply the outbound connection rate-limit to actual connections (#2278)
• Rate limit initial genesis block download retries, Credit: Equilibrium (#2255)

Zebra 1.0.0-alpha.10 - 2021-06-09

Zebra's latest alpha continues our work on NU5, including Orchard and Transaction V5. It also includes some security fixes.

Added

Network Upgrade 5

• Store Orchard nullifiers into the state (#2185)

Testing and Bug Reports

• Generate test chains that pass basic chain consistency tests (#2221)
• Make arbitrary block chains pass some genesis checks (#2208)
• Test Eq/PartialEq for Orchard keys (#2187, #2228)
• Further test new transaction consensus rules (#2246)
• Create workflow to regenerate cached state disks for tests (#2247)
• Add final sapling root test vectors (#2243)

Changed

• Make sure the mandatory checkpoint includes the Canopy activation block (#2235)
• Move the check in transaction::check::sapling_balances_match to V4 deserialization (#2234)

Network Upgrade 5

• Implement more Transaction checks for Transaction Version 5 and Orchard (#2229, #2236)

Testing and Diagnostics

• Make debugging easier on proptests with large vectors (#2232, #2222)
• Update test job to use cached state version 5 (#2253)
• Add the database format to the panic metadata (#2249)

Developer Workflows

• Update the GitHub and RFC templates based on retrospectives (#2242)

Fixed

• Get redpallas tweak proptests working again (#2219)

Testing

• Adjust the benchmark sample size so all benchmarks finish successfully (#2237)
• Fix scriptCode serialization and sighash test vectors (#2198)
• Allow multi-digit Zebra alpha versions in the zebrad acceptance tests (#2250)

Security

• Don't trust future gossiped last seen times (#2178)
• Stop panicking when serializing out-of-range times, Credit: Equilibrium (#2203, #2210)
• Rate limit GetAddr messages to any peer, Credit: Equilibrium (#2254)
• Prevent bursts of reconnection attempts (#2251)

Zebra 1.0.0-alpha.9 - 2021-05-26

Zebra's latest alpha continues our work on NU5, including Orchard and Transaction V5, and includes several security fixes.

Added

• Added a new zcash_serialize_bytes utility function (#2150)
• Added new Arbitrary impls for a number of types in zebra-chain and zebra-network (#2179)
• Zebra support for leap seconds (#2195)

Network Upgrade 5

• Zebra can now serialize and deserialize orchard shielded data (#2116)
• We now have some Action methods for orchard shielded data (#2199)

Testing and Bug Reports

• Added extra instrumentation for initialize and handshakes (#2122)

Changed

• Collect and send more accurate peer addresses (#2123)
• Enable cargo env vars when there is no .git during a build, fix tag lookup, add build profile, add modified flag (#2065)

Testing

• Stop generating V1-V3 transactions for non-finalized state proptests (#2159)
• Added some logging to troubleshoot failing tests for redpallas signature (#2169)

Fixed

• Fix clippy::cmp_owned for (sapling, orchard)::keys with ConstantTimeEq (#2184)

Documentation

• Fixed some typos and links in the documentation(#2157, #2174, #2180)

Security

• Reject compact sizes greater than the protocol message limit (#2155)
• Handle small numbers of initial peers better (#2154)
  • This security issue was reported by Equilibrium
• Stop panicking on out-of-range version timestamps (#2148)
  • This security issue was reported by Equilibrium
• Stop gossiping temporary inbound remote addresses to peers (#2120)
  • If Zebra was configured with a valid (not unspecified) listener address, it would gossip the ephemeral ports of inbound connections to its peers. This fix stops Zebra sending these useless addresses to its mainnet and testnet peers.
• Avoid silently corrupting invalid times during serialization (#2149)
• Do version checks first, then send a verack response (#2121)
• Remove checkout credentials from GitHub actions (#2158)
• Make CandidateSet timeout and initial fanout more reliable (#2172)
• Remove CandidateSet state and add last seen time limit to validate_addrs (#2177)

Zebra 1.0.0-alpha.8 - 2021-05-12

Zebra's latest alpha continues our work on NU5, including Orchard and Transaction V5.

Added

Network Upgrade 5

• Continue implementation of Transaction V5 (#2070, #2075, #2100)
• Implementation of data structures for Orchard support in Zebra (#1885)
• Implementation of redpallas in Zebra (#2099)

Testing and Bug Reports

• Enable more Transaction v5 tests (#2063)

Documentation

• Document how Zebra does cross-crate proptests (#2069, #2071)
• Explain how to derive arbitrary impls in the dev docs (#2081)
• Async in Zebra RFC (#1965, #2111)
• Fixes and updates to Zebra Book TOC and process (#2124, #2126)
• Improvements to release process (#2138)
• Explicitly allow unencrypted disclosures for alpha releases (#2127)

Changed

Refactors and Cleanups

• Clippy nightly: disable owned cmp, stop comparing bool using assert_eq (#2073, #2117)

Fixed

Testing and Logging

• Remove broken ci-success job, which was skipping some required checks (#2084)
• Improve CI speed by removing redundant build jobs and Rust components (#2088)
• Fix a bad merge that was committed to main (#2085)

Zebra v1.0.0-alpha.7 - 2021-04-23

Zebra's latest alpha continues our work on NU5/Orchard, and fixes some security and protocol correctness issues.

Zebra now has best-effort support for Apple M1 builds, and logging to systemd-journald.

Added

Network Upgrade 5

• Implement Sapling serialization in Transaction V5 (#1996, #2017, #2020, #2021, #2057)
• Draft RFC: Treestate management (#983)

Configuration and Logging

• Stop requiring a port for Zcash listener addresses (#2043)
  • use the default port if there is no configured port
• Add journald support through tracing-journald (#2034)
  • Zebra does not have any journald integration tests, so we will support it on a best-effort basis

Testing and Bug Reports

• Benchmark Block struct serialization code (#2018)
• Add the new commit count and git hash to the version in bug reports (#2038)
• Add branch, commit time, and build target to the panic metadata (#2028)
• Automatically update app version from crate version (#2028)

Changed

Supported Platforms and Dependencies

• Update dependencies to support Apple M1 (#2026)
  • Zebra does not have any Apple M1 CI, so we will support it on a best-effort basis
• Bump ripemd160 from 0.8.0 to 0.9.1 and remove trait import (#2027)
• Update to vergen 5 (#2029)

Refactors and Cleanups

• Refactor and document correctness for std::sync::Mutex in ErrorSlot (#2032)
• Refactor and document correctness for std::sync::Mutex (#2033)
• Make Zcash string serialization consistent with deserialization (#2053)
• clippy: make to_* methods take self by value (#2006)

Testing

• Speedup proptests for Chain struct in zebra-state (#2012)

Fixed

• Stop assuming there will always be a .git directory during builds (#2037)
• Clarify CandidateSet state diagram (#2036)

Network Protocol

• Stop panicking when Zebra sends a reject without extra data (#2016)
• Switch to an async mutex for handshake nonces (#2031)

Testing and Logging

• Fix a test failure due to ' debug format changes in Rust (#2014)
• Fix Windows CI LLVM paths (#2026)
• Clarify a duplicate log message (#2054)

Security

Network

• Avoid a single peer providing a majority of Zebra's peer addresses (#2004)
• Make sure handshake version negotiation always has a timeout (#2008)
• Make sure each peer heartbeat has a timeout (#2009)

Memory Usage

• Implement vector deserialisation limits for new Transaction::V5 types (#1996)

Zebra v1.0.0-alpha.6 - 2021-04-09

Zebra's latest alpha includes more validation of pre-NU5 consensus rules, continues our work on NU5/Orchard, and fixes some security and protocol correctness issues.

The Zebra project now has a Code of Conduct.

Added

• Design for Transaction V5 (#1886)
  • Make shielded data and spends generic over Transaction V4 and V5 (#1946, #1989)
• Async batching for:
  • Sprout JoinSplit signatures (#1952)
  • Sapling Spend and Output Groth16 proofs (#1713)
• Enable Joinsplit and Spend spend auth sighash verification (#1940)
• Randomised property tests for InventoryHash and MetaAddr (#1985)

Documentation

• Update the RFC process to include draft RFCs (#1962)
  • Merge some open RFCs as drafts (#1006, #1007, #1063, #1129)
• Add a fast start option to the Zebra Client RFC (#1969)
• Document that Zebra's mandatory checkpoint can change (#1935)

Changed

• Refactor the Block Commitment field based on ZIP-244 (#1957, #1978, #1988)

Fixed

• Stop ignoring inbound message errors and handshake timeouts (#1950)
• Don't send a useless heartbeat when the peer connection is already closing (#1950)

Security

• Reduce deserialized memory usage for malicious blocks (#1920, #1977)
• Ensure that new MetaAddr fields are sanitized (#1942)
• Fix a deadlock between the peer address crawler and peer dialer when all connections fail (#1950)
• Avoid starvation of handshakes and crawling under heavy syncer load (#1950)
• Avoid starvation of request cancellations and timeouts under heavy peer response load (#1950)
• Async network code correctness documentation (#1954, #1972)

Zebra v1.0.0-alpha.5 - 2021-03-23

Zebra's latest alpha checkpoints on Canopy activation, continues our work on NU5, and fixes a security issue.

Some notable changes include:

Added

• Log address book metrics when PeerSet or CandidateSet don't have many peers (#1906)
• Document test coverage workflow (#1919)
• Add a final job to CI, so we can easily require all the CI jobs to pass (#1927)

Changed

• Zebra has moved its mandatory checkpoint from Sapling to Canopy (#1898, #1926)
  • This is a breaking change for users that depend on the exact height of the mandatory checkpoint.

Fixed

• tower-batch: wake waiting workers on close to avoid hangs (#1908)
• Assert that pre-Canopy blocks use checkpointing (#1909)
• Fix CI disk space usage by disabling incremental compilation in coverage builds (#1923)

Security

• Stop relying on unchecked length fields when preallocating vectors (#1925)

Zebra v1.0.0-alpha.4 - 2021-03-17

Zebra's latest alpha starts our work on NU5 and fixes several security issues.

Some notable changes include:

Added

Network Upgrade 5

• Add some NU5 constants to zebra (#1823)
• Start work on transaction version 5 (#1824)

Metrics

• Add Grafana dashboards (#1830)
• Add Zebra version info to metrics (#1900)
• Add message type tag to message metrics (#1900)

Changed

• ZIP-215 Explicitly Defining and Modifying Ed25519 Validation Rules (#1811)
• Metrics renaming to enable node interoperability (#1900)
  • Renaming metrics breaks existing Grafana configs
• Rename config network.new_peer_interval to crawl_new_peer_interval (#1855)
  • This change includes a backwards-compatibility alias, so existing configs do not need to be updated

Fixed

Code Style

• Apply nightly clippy suggestions (#1834)

Documentation

• Re-enable zebra.zfnd.org deployment (#1792)
• Document and log trailing message bytes (#1888)
• Move design/data-flow to rfcs/drafts (#1825)
• Document how inbound connections are added to the CandidateSet (#1852)

Hangs and Panics

• Fix a peer DNS resolution edge case (#1796)
• Stop sending blocks and transactions on the first error (#1818)
• Revert a connection refactor that caused frequent hangs (#1803)

Testing

• Avoid acceptance test port conflicts (#1812)
• Re-enable the checkpoint verifier restart tests (#1837)
• Adjust the crawl interval and acceptance test timeout (#1878)
• Explicitly auto-delete additional cache disks (#1859)

Security

• Reduce inbound concurrency to limit memory usage (#1881)
• Verify proof-of-work in the checkpoint verifier (#1882)
• Implement outbound connection rate limiting (#1855)
• Document that the configured Zcash listener IP address is advertised to remote peers (#1891)

Zebra v1.0.0-alpha.3 - 2021-02-23

Zebra's latest alpha brings multiple reliability and stability improvements for node startup, long-running syncs, and testing.

Some notable changes include:

Added

• Add beta rust to CI (#1725)
• Add Usability Testing Plan GitHub issue template (#1519)
• Add Release Checklist GitHub pull request template (#1717)

Changed

• Compute the network message body length to reduce heap allocations (#1773)
• Re-enable the macOS conflict acceptance tests (#1778)
• Re-enable coverage CI (#1758, #1787)
• Disable fail-fast in the CI test job (#1776)
• Rename responsible_disclosure.md to SECURITY.md (#1747)

Removed

• Disable unreliable testnet large sync test (#1789)

Fixed

Hangs and Panics

• Refactor connection.rs to make fail_with panics impossible (#1721)
• Stop ignoring failed peer addresses (#1709)
• Retry initial peer DNS resolution on failure (#1762)
• Update tower-batch semaphore implementation (#1764)
• Use ready! in ChainVerifier::poll_ready (#1735)
• Use CallAllUnordered in peer_set::add_initial_peers (#1734)

Testing

• Bump CI build and test timeouts to 60 minutes (#1757)
• Run CI workflow on push to main & manual request (#1748)
• Set ZEBRA_SKIP_NETWORK_TESTS using Windows syntax (#1782)
• Fix Windows build failures due to disk space (#1726)
• Fix acceptance test timeouts, cleanup, and diagnostics (#1736, #1766, #1770, #1777)

Logging and Metrics

• Update PeerSet metrics after every change (#1727)
• Log initial peer connection failures (#1763)

Zebra v1.0.0-alpha.2 - 2021-02-09

Zebra's latest alpha brings multiple reliability and stability improvements for node startup, node shutdown, and long-running syncs.

Some notable changes include:

Added

• Asynchronous Groth16 verification (#830)
• Security disclosure principles (#1650)

Changed

• Document that connect_isolated only works on mainnet (#1693)
• Document the impact of the redjubjub channel bound (#1682)
• Log when the syncer awaits peer readiness (#1714)

Fixed

• Fix shutdown panics (#1637)
• Add hints to port conflict and lock file panics (#1535)
• Perform DNS seeder lookups concurrently, and add timeouts (#1662)
• Avoid buffer slot leaks in the Inbound service (#1620)
• Avoid a buffer slot leak by removing CallAllUnordered (#1705)
• Avoid future buffer slot leaks in ChainVerifier (#1700)
• Limit inbound download and verify queue (#1622)
• Increase a tower-batch queue bound (#1691)
• Fix a f64::NAN metrics sentinel (#1642)
• Actually use VerifyCheckpointError::CommitFinalized (#1706)

Zebra v1.0.0-alpha.1 - 2021-01-30

Zebra's second alpha brings multiple reliability and stability improvements for long-running syncs.

We've resolved known panics during syncing, and reduced the number of sync hangs.

Some notable changes include:

Added

• Add peer set tracing (#1468)
• Add Sentry support behind a feature flag (#1461)
• Log configured network in every log message (#1568)

Changed

• Export new precompute api in zebra-script (#1493)
• Rewrite peer block request handler to match the zcashd implementation (#1518)

Fixed

• Avoid panics when there are multiple failures on the same connection (#1600)
• Add sync and inbound timeouts to prevent hangs (#1586)
• Fix Zebra versions so all crates are on the 1.0.0-alpha series (#1488)
• Make 'cargo run' use 'zebrad' rather than failing (#1569)
• Panic if the lookahead limit is misconfigured (#1589)
• Recommend using --locked with 'cargo install' (#1490)
• Simplify C++ compiler dependency in the README (#1498)
• Stop failing acceptance tests if their directories already exist (#1588)
• Stop panicking when ClientRequests return an error (#1531)
• Upgrade to tokio 0.3.6 to avoid a time wheel panic (#1583, #1511)

Currently, Zebra does not validate all the Zcash consensus rules.

Zebra v1.0.0-alpha.0 - 2021-01-30

Zebra first alpha release 🎉

The goals of this release are to:

• participate in the Zcash network,
• replicate the Zcash chain state,
• implement the Zcash proof of work consensus rules, and
• sync on Mainnet under excellent network conditions.

Currently, Zebra does not validate all the Zcash consensus rules. It may be unreliable on Testnet, and under less-than-perfect network conditions.