From 330d9c1490999d9271df98e4f5e7c279b8261d40 Mon Sep 17 00:00:00 2001 From: Steven Roose Date: Wed, 6 Sep 2023 16:16:35 +0100 Subject: [PATCH] Add BIP for OP_TXHASH and OP_CHECKTXHASHVERIFY --- bip-txhash.mediawiki | 203 +++ bip-txhash/ref-impl/Cargo.toml | 14 + bip-txhash/ref-impl/src/main.rs | 595 +++++++++ bip-txhash/ref-impl/txhash_vectors.json | 1591 +++++++++++++++++++++++ 4 files changed, 2403 insertions(+) create mode 100644 bip-txhash.mediawiki create mode 100644 bip-txhash/ref-impl/Cargo.toml create mode 100644 bip-txhash/ref-impl/src/main.rs create mode 100644 bip-txhash/ref-impl/txhash_vectors.json diff --git a/bip-txhash.mediawiki b/bip-txhash.mediawiki new file mode 100644 index 0000000000..d508fa2f07 --- /dev/null +++ b/bip-txhash.mediawiki @@ -0,0 +1,203 @@ +
+  BIP: tbd
+  Layer: Consensus (soft fork)
+  Title: OP_TXHASH and OP_CHECKTXHASHVERIFY
+  Author: Steven Roose 
+  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-tbd
+  Status: Draft
+  Type: Standards Track
+  Created: 2023-09-03
+  License: BSD-3-Clause
+
+ +==Abstract== + +This BIP proposes two new opcodes, OP_CHECKTXHASHVERIFY, to be activated +as a change to the semantics of OP_NOP4 in legacy script, segwit and tapscript; +and OP_TXHASH, to be activated as a change to the semantics of OP_SUCCESS189 +in tapscript only. + +These opcodes provide a generalized method for introspecting certain details of +the spending transaction, which enables non-interactive enforcement of certain +properties of the transaction spending a certain UTXO. + +The constructions specified in this BIP also open up the way for other +potential updates; see Motivation section for more details. + + +==Summary== + +===OP_CHECKTXHASHVERIFY=== + +The first new opcode, OP_CHECKTXHASHVERIFY, redefines the OP_NOP4 opcode (0xb3) as a soft fork upgrade. + +It has the following semantics: + +* There is at least one element on the stack, fail otherwise. +* The element on the stack is at least 32 bytes long, fail otherwise. +* The first 32 bytes are interpreted as the TxHash and the remaining suffix bytes specify the TxFieldSelector. +* If the TxFieldSelector is invalid, fail. +* The actual TxHash of the transaction at the current input index, calculated using the given TxFieldSelector must be equal to the first 32 bytes of the element on the stack, fail otherwise. + + +===OP_TXHASH=== + +The second new opcode, OP_TXHASH, redefines the OP_SUCCESS189 tapscript opcode (0xbd) as a soft fork upgrade. + +It has the following semantics: + +* There is at least one element on the stack, fail otherwise. +* The element is interpreted as the TxFieldSelector and is popped off the stack. +* If the TxFieldSelector is invalid, fail. +* The 32-byte TxHash of the transaction at the current input index, calculated using the given TxFieldSelector is pushed onto the stack. + +===TxFieldSelector=== + +The TxFieldSelector has the following semantics. We will give a brief conceptual +summary, followed by a reference implementation of the CalculateTxHash function. + +* There are two special cases for the TxFieldSelector: +** the empty value, zero bytes long: it is set equal to TXFS_SPECIAL_TEMPLATE, the de-facto default value which means everything except the prevouts and the prevout scriptPubkeys. + +Special case TXFS_SPECIAL_TEMPLATE is 4 bytes long, as follows: +*** 1. TXFS_ALL +*** 2. TXFS_INPUTS_TEMPLATE | TXFS_OUTPUTS_ALL +*** 3. TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL +*** 4. TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL + +** the 0x00 byte: it is set equal to TXFS_SPECIAL_ALL, which means "ALL" and is primarily useful to emulate SIGHASH_ALL when OP_TXHASH is used in combination with OP_CHECKSIGFROMSTACK. + +Special case TXFS_SPECIAL_TEMPLATE is 4 bytes long, as follows: +*** 1. TXFS_ALL +*** 2. TXFS_INPUTS_ALL | TXFS_OUTPUTS_ALL +*** 3. TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL +*** 4. TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL + +* The first byte of the TxFieldSelector has its 8 bits assigned as follows, from lowest to highest: +** 1. version (TXFS_VERSION) +** 2. locktime (TXFS_LOCKTIME) +** 3. current input index (TXFS_CURRENT_INPUT_IDX) +** 4. current input control block (or empty) (TXFS_CURRENT_INPUT_CONTROL_BLOCK) +** 5. current script last OP_CODESEPARATOR position (or 0xffffffff) (TXFS_CURRENT_INPUT_LAST_CODESEPARATOR_POS) +** 6. inputs (TXFS_INPUTS) +** 7. outputs (TXFS_OUTPUTS) + +* The last (highest) bit of the first byte (TXFS_CONTROL), we will call the "control bit", and it can be used to control the behavior of the opcode. For OP_TXHASH and OP_CHECKTXHASHVERIFY, the control bit is used to determine whether the TxFieldSelector itself has to be included in the resulting hash. (For potential other uses of the TxFieldSelector (like a hypothetical OP_TX), this bit can be repurposed.) + +* If either "inputs" or "outputs" is set to 1, expect another byte with its 8 bits assigning the following variables, from lowest to highest: +** Specifying which fields of the inputs will be selected: +*** 1. prevouts (TXFS_INPUTS_PREVOUTS) +*** 2. sequences (TXFS_INPUTS_SEQUENCES) +*** 3. scriptSigs (TXFS_INPUTS_SCRIPTSIGS) +*** 4. prevout scriptPubkeys (TXFS_INPUTS_PREV_SCRIPTPUBKEYS) +*** 5. prevout values (TXFS_INPUTS_PREV_VALUED) +*** 6. taproot annexes (TXFS_INPUTS_TAPROOT_ANNEXES) +** Specifying which fields of the outputs will be selected: +*** 7. scriptPubkeys (TXFS_OUTPUTS_SCRIPTPUBKEYS) +*** 8. values (TXFS_OUTPUTS_VALUES) + +//TODO(stevenroose) check that the 7 and 8 render correctly + +* We define as follows: +** TXFS_ALL = TXFS_VERSION | TXFS_LOCKTIME | TXFS_CURRENT_INPUT_IDX | TXFS_CURRENT_INPUT_CONTROL_BLOCK | TXFS_CURRENT_INPUT_LAST_CODESEPARATOR_POS | TXFS_INPUTS | TXFS_OUTPUTS | TXFS_CONTROL +** TXFS_INPUTS_ALL = TXFS_INPUTS_PREVOUTS | TXFS_INPUTS_SEQUENCES | TXFS_INPUTS_SCRIPTSIGS | TXFS_INPUTS_PREV_SCRIPTPUBKEYS | TXFS_INPUTS_PREV_VALUES | TXFS_INPUTS_TAPROOT_ANNEXES +** TXFS_INPUTS_TEMPLATE = TXFS_INPUTS_SEQUENCES | TXFS_INPUTS_SCRIPTSIGS | TXFS_INPUTS_PREV_VALUES | TXFS_INPUTS_TAPROOT_ANNEXES +** TXFS_OUTPUTS_ALL = TXFS_OUTPUTS_SCRIPTPUBKEYS | TXFS_OUTPUTS_VALUES + +For both inputs and then outputs, do the following: + +* If the "in/outputs" field is set to 1, another additional byte is expected: +** The highest bit (TXFS_INOUT_NUMBER) indicates whether the "number of in-/outputs" should be committed to. +** For the remaining bits, there are three exceptional values: +*** 0x00 (TXFS_INOUT_SELECTION_NONE) means "no in/outputs" (hence only the number of them as 0x80 (TXFS_INOUT_NUMBER)). +*** 0x40 (TXFS_INOUT_SELECTION_CURRENT) means "select only the in/output of the current input index" (it is invalid when current index exceeds number of outputs). +*** 0x3f (TXFS_INOUT_SELECTION_ALL) means "select all in/outputs". +** The second highest bit (TXFS_INOUT_SELECTION_MODE) is the "specification mode": +*** Set to 0 it means "leading mode". +*** Set to 1 it means "individual mode". +** The third highest bit (TXFS_INOUT_SELECTION_SIZE) is used to indicate the "index size", i.e. the number of bytes will be used to represent in/output indices. +** In "leading mode", +*** With "index size" set to 0, the remaining lowest 5 bits of the first byte will be interpreted as the number of leading in/outputs to select. +*** With "index size" set to 1, the remaining lowest 5 bits of the first byte together with the 8 bits of the next byte will be interpreted as the number of leading in/outputs to select. +** In "individual mode", the remaining lowest 5 bits of the first byte will be interpreted as `n`, the number of individual in/outputs to select. +*** With "index size" set to 0, interpret the following `n` individual bytes as the indices of an individual in/outputs to select. +*** With "index size" set to 1, interpret the next `n` pairs of two bytes as the indices of individual in/outputs to select. + +Effectively, this allows a user to select +* all in/outputs +* the current input index +* the leading in/outputs up to 8192 +* up to 32 individually selected in/outputs + +The TxFieldSelector is invalid when +* a byte is expected but missing +* additional unexpected bytes are present +* index size is set to 1 while not being necessary +* a leading number of individual index is selected out of bounds of the in/outputs +* individual indices are duplicated or not in increasing order + +These limitations are to avoid potential TxFieldSelector malleability. It is +however allowed to use leading mode where it could be "all". This +is important to allow for optional addition of extra inputs or outputs. +//TODO(stevenroose) should we disallow individual that could be leading? + + +===Resource limits=== + +* For legacy scripts and segwit, we don't add any extra resource limitations, with the argumentation that OP_CHECKTXHASHVERIFY already requires the user to provide at least 32 bytes of extra transaction size, either in the input scriptSig, or the witness. Additional more complex hashes require additional witness bytes. Given that OP_CAT is not available in this context, if a malicious user tries to increase the number of TransactionHashes being calculated by using opcodes like OP_DUP, the TxFieldSelector for all these calculations is identical, so the calculation can be cached within the same transaction. + +* For tapscript, primarily motivated by the cheaper opcode OP_TXHASH (it doesn't require an additional 32 witness bytes be provided) and the potential future addition of byte manipulation opcodes like OP_CAT, an additional cost is specified per TransactionHash execution. Using the same validation budget ("sigops budget") introduced in BIP-0342, each TransactionHash decreases the validation budget by 10. If this brings the budget below zero, the script fails immediately. + +The following considerations should be made: + +** All fields that can be of arbitrary size are cachable as TransactionHash always hashes their hashed values. +** In "individual mode", a user can at most commit 32 inputs or outputs, which we don't consider excessive for potential repeated use. +** In "prefix mode", a caching strategy can be used where the SHA256 context is stored every N in/outputs so that multiple executions of the TransactionHash function can use the caches and only have to hash an additional N-1 items at most. + + +==Motivation== + +This BIP specifies a basic transaction introspection primitive that is useful +to either reduce interactivity in multi-user protocols or to enforce some basic +constraints on transactions. + +Additionally, the constructions specified in this BIP can lay the groundwork for +some potential future upgrades: +* The TxFieldSelector construction would work well with a hypothetical opcode OP_TX that allows for directly introspecting the transaction by putting the fields selected on the stack instead of hashing them together. +* The TransactionHash obtained by OP_TXHASH can be combined with a hypothetical opcode OP_CHECKSIGFROMSTACK to effectively create an incredibly flexible signature hash, which would enable constructions like SIGHASH_ANYPREVOUT. + +===Comparing with some alternative proposals=== + +* This proposal strictly generalizes BIP-119's OP_CHECKTEMPLATEVERIFY, as the default mode of our TxFieldSelector is effectively the same (though not byte-for-byte identical) as what OP_CTV acomplishes, without costing any additional bytes. Additionally, using OP_CHECKTXHASHVERIFY allows for more flexibility which can help in the case for +** enabling adding fees to a transaction without breaking a multi-tx protocol; +** multi-user protocols where users are only concerned about their own inputs and outputs. + +* Constructions like OP_IN_OUT_VALUE used with OP_EQUALVERIFY can be emulated by two OP_TXHASH instances by using the TxFieldSelector to select a single input value first and a single output value second and enforcing equality on the hashes. Neither of these alternatives can be used to enforce small value differencials without the use of 64-bit arithmetic. + +* Like mentioned above, SIGHASH_ANYPREVOUT can be emulated using OP_TXHASH when combined with OP_CHECKSIGFROMSTACK: OP_TXHASH OP_CHECKSIGFROMSTACK` effectively emulates SIGHASH_ANYPREVOUT. + + + + +==Detailed Specification== + +A reference implementation in Rust is provided attached as part of this BIP +together with a JSON file of test vectors generated using the reference +implementation. + + +==Implementation== + +* A proposed implementation for Bitcoin Core is available here: https://github.com/bitcoin/bitcoin/pull/29050 +* A proposed implementation for rust-bitcoin is available here: https://github.com/rust-bitcoin/rust-bitcoin/pull/2275 + + +==Acknowledgement== + +Credit for this proposal mostly goes to Jeremy Rubin for his work on BIP-119's +OP_CHECKTEMPLATEVERIFY and to Russell O'Connor for the original idea of +generalizing CTV into OP_TXHASH. + +Additional thanks to Andrew Poelstra, Greg Sanders, Rearden Code, Rusty Russell +and others for their feedback on the specification. + diff --git a/bip-txhash/ref-impl/Cargo.toml b/bip-txhash/ref-impl/Cargo.toml new file mode 100644 index 0000000000..e17f8d49c7 --- /dev/null +++ b/bip-txhash/ref-impl/Cargo.toml @@ -0,0 +1,14 @@ +[package] +name = "txhash-ref" +version = "0.0.0" +edition = "2021" + +[dependencies] +bitcoin = { version = "0.31.0", features = [ "serde" ] } +serde_json = "1.0.108" + +# until bitcoin-io is released and https://github.com/rust-bitcoin/rust-bitcoin/pull/2274 is merged +[patch.crates-io] +bitcoin = { git = "https://github.com/stevenroose/rust-bitcoin.git", branch = "txhash", features = [ "serde" ] } +bitcoin_hashes = { git = "https://github.com/stevenroose/rust-bitcoin.git", branch = "txhash" } +bitcoin-io = { git = "https://github.com/stevenroose/rust-bitcoin.git", branch = "txhash" } diff --git a/bip-txhash/ref-impl/src/main.rs b/bip-txhash/ref-impl/src/main.rs new file mode 100644 index 0000000000..a41b0ecb96 --- /dev/null +++ b/bip-txhash/ref-impl/src/main.rs @@ -0,0 +1,595 @@ + +use bitcoin::{Transaction, TxOut}; +use bitcoin::consensus::encode::Encodable; +use bitcoin::hashes::{sha256, Hash, HashEngine}; + +pub const TXFS_VERSION: u8 = 1 << 0; +pub const TXFS_LOCKTIME: u8 = 1 << 1; +pub const TXFS_CURRENT_INPUT_IDX: u8 = 1 << 2; +pub const TXFS_CURRENT_INPUT_CONTROL_BLOCK: u8 = 1 << 3; +pub const TXFS_CURRENT_INPUT_LAST_CODESEPARATOR_POS: u8 = 1 << 4; +pub const TXFS_INPUTS: u8 = 1 << 5; +pub const TXFS_OUTPUTS: u8 = 1 << 6; + +pub const TXFS_CONTROL: u8 = 1 << 7; + +pub const TXFS_ALL: u8 = TXFS_VERSION + | TXFS_LOCKTIME + | TXFS_CURRENT_INPUT_IDX + | TXFS_CURRENT_INPUT_CONTROL_BLOCK + | TXFS_CURRENT_INPUT_LAST_CODESEPARATOR_POS + | TXFS_INPUTS + | TXFS_OUTPUTS + | TXFS_CONTROL; + +pub const TXFS_INPUTS_PREVOUTS: u8 = 1 << 0; +pub const TXFS_INPUTS_SEQUENCES: u8 = 1 << 1; +pub const TXFS_INPUTS_SCRIPTSIGS: u8 = 1 << 2; +pub const TXFS_INPUTS_PREV_SCRIPTPUBKEYS: u8 = 1 << 3; +pub const TXFS_INPUTS_PREV_VALUES: u8 = 1 << 4; +pub const TXFS_INPUTS_TAPROOT_ANNEXES: u8 = 1 << 5; +pub const TXFS_OUTPUTS_SCRIPTPUBKEYS: u8 = 1 << 6; +pub const TXFS_OUTPUTS_VALUES: u8 = 1 << 7; + +pub const TXFS_INPUTS_ALL: u8 = TXFS_INPUTS_PREVOUTS + | TXFS_INPUTS_SEQUENCES + | TXFS_INPUTS_SCRIPTSIGS + | TXFS_INPUTS_PREV_SCRIPTPUBKEYS + | TXFS_INPUTS_PREV_VALUES + | TXFS_INPUTS_TAPROOT_ANNEXES; +pub const TXFS_INPUTS_TEMPLATE: u8 = TXFS_INPUTS_SEQUENCES + | TXFS_INPUTS_SCRIPTSIGS + | TXFS_INPUTS_PREV_VALUES + | TXFS_INPUTS_TAPROOT_ANNEXES; +pub const TXFS_OUTPUTS_ALL: u8 = TXFS_OUTPUTS_SCRIPTPUBKEYS | TXFS_OUTPUTS_VALUES; + +pub const TXFS_INOUT_NUMBER: u8 = 1 << 7; +pub const TXFS_INOUT_SELECTION_NONE: u8 = 0x00; +pub const TXFS_INOUT_SELECTION_CURRENT: u8 = 0x40; +pub const TXFS_INOUT_SELECTION_ALL: u8 = 0x3f; +pub const TXFS_INOUT_SELECTION_MODE: u8 = 1 << 6; +pub const TXFS_INOUT_SELECTION_SIZE: u8 = 1 << 5; +pub const TXFS_INOUT_SELECTION_MASK: u8 = + 0xff ^ TXFS_INOUT_NUMBER ^ TXFS_INOUT_SELECTION_MODE ^ TXFS_INOUT_SELECTION_SIZE; + + +pub const TXFS_SPECIAL_ALL: [u8; 4] = [ + TXFS_ALL, + TXFS_INPUTS_ALL | TXFS_OUTPUTS_ALL, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL, +]; +pub const TXFS_SPECIAL_TEMPLATE: [u8; 4] = [ + TXFS_ALL, + TXFS_INPUTS_TEMPLATE | TXFS_OUTPUTS_ALL, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL, +]; + +const SHA256_EMPTY: sha256::Hash = sha256::Hash::const_hash(&[]); + +/// Parse an input or output selection from the TxFieldSelector bytes. +/// +/// Returns the selected indices and a flag whether to commit the number of items. +fn parse_inout_selection( + bytes: &mut impl Iterator, + nb_items: usize, + current_input_idx: u32, +) -> Result<(Vec, bool), &'static str> { + let first = bytes.next().ok_or("in/output bit set but selection byte missing")?; + let commit_number = (first & TXFS_INOUT_NUMBER) != 0; + let selection = first & (0xff ^ TXFS_INOUT_NUMBER); + + let selected = if selection == TXFS_INOUT_SELECTION_NONE { + if !commit_number { + return Err("no in/output selection given and nb_items bitflag also unset"); + } + vec![] + } else if selection == TXFS_INOUT_SELECTION_ALL { + (0..nb_items).collect() + } else if selection == TXFS_INOUT_SELECTION_CURRENT { + if current_input_idx as usize >= nb_items { + // NB can only happen for outputs + return Err("current input index exceeds number of outputs and current output selected"); + } + vec![current_input_idx as usize] + } else if (selection & TXFS_INOUT_SELECTION_MODE) == 0 { // leading mode + let count = if (selection & TXFS_INOUT_SELECTION_SIZE) == 0 { + (selection & TXFS_INOUT_SELECTION_MASK) as usize + } else { + if (selection & TXFS_INOUT_SELECTION_MASK) == 0 { + return Err("non-minimal leading selection"); + } + let next_byte = bytes.next().ok_or("second leading selection byte missing")?; + (((selection & TXFS_INOUT_SELECTION_MASK) as usize) << 8) + next_byte as usize + }; + assert_ne!(count, 0, "this should be interpreted as NONE above"); + if count > nb_items { + return Err("selected number of leading in/outputs out of bounds"); + } + (0..count).collect() + } else { // individual mode + let count = (selection & TXFS_INOUT_SELECTION_MASK) as usize; + if count == 0 { + return Err("can't select 0 in/outputs in individual mode"); + } + + let mut selected = Vec::with_capacity(count as usize); + for _ in 0..count { + let idx = if (selection & TXFS_INOUT_SELECTION_SIZE) == 0 { + bytes.next().ok_or("not enough single-byte indices")? as usize + } else { + let first = bytes.next().ok_or("first byte of two-byte index missing")?; + let second = bytes.next().ok_or("second byte of two-byte index missing")?; + (first as usize) << 8 + (second as usize) + }; + if idx > nb_items { + return Err("selected index out of bounds"); + } + if let Some(last) = selected.last() { + if idx <= *last { + return Err("selected indices not in increasing order") + } + } + selected.push(idx); + } + selected + }; + Ok((selected, commit_number)) +} + +/// +/// +/// Assumes that TxFieldSelector is valid. +pub fn calculate_txhash( + txfs: &[u8], + tx: &Transaction, + prevouts: &[TxOut], + current_input_idx: u32, + current_input_last_codeseparator_pos: Option, +) -> Result { + assert_eq!(tx.input.len(), prevouts.len()); + + let txfs = if txfs.is_empty() { + &TXFS_SPECIAL_TEMPLATE + } else if txfs.len() == 1 && txfs[0] == 0x00 { + &TXFS_SPECIAL_ALL + } else { + txfs + }; + + let mut engine = sha256::Hash::engine(); + + if (txfs[0] & TXFS_CONTROL) != 0 { + engine.input(txfs); + } + + let mut bytes = txfs.iter().copied(); + let global = bytes.next().unwrap(); + if (global & TXFS_VERSION) != 0 { + tx.version.consensus_encode(&mut engine).unwrap(); + } + if (global & TXFS_LOCKTIME) != 0 { + tx.lock_time.consensus_encode(&mut engine).unwrap(); + } + if (global & TXFS_CURRENT_INPUT_IDX) != 0 { + (current_input_idx as u32).consensus_encode(&mut engine).unwrap(); + } + let cur = current_input_idx as usize; + if (global & TXFS_CURRENT_INPUT_CONTROL_BLOCK) != 0 { + let cb = if prevouts[cur].script_pubkey.is_p2tr() { + tx.input[cur].witness.taproot_control_block().unwrap_or(&[]) + } else { + &[] + }; + engine.input(&sha256::Hash::hash(&cb)[..]); + } + if (global & TXFS_CURRENT_INPUT_LAST_CODESEPARATOR_POS) != 0 { + let pos = current_input_last_codeseparator_pos.unwrap_or(u32::MAX); + (pos as u32).consensus_encode(&mut engine).unwrap(); + } + + // Stop early if no inputs or outputs are selected. + if (global & TXFS_INPUTS) == 0 && (global & TXFS_OUTPUTS) == 0 { + if txfs.len() > 1 { + return Err("input and output bit unset and more than one byte in txfs"); + } + return Ok(sha256::Hash::from_engine(engine)); + } + + // Now that we know we have some inputs and/or some outputs to commit. + let inout_fields = bytes.next().ok_or("in- or output bit set but only one byte")?; + + if (global & TXFS_INPUTS) == 0 { + if (inout_fields & TXFS_INPUTS_ALL) != 0 { + return Err("inputs bit not set but some input field bits set"); + } + } else { + let (selection, commit_number) = parse_inout_selection( + &mut bytes, tx.input.len(), current_input_idx, + )?; + + if (inout_fields & TXFS_INPUTS_ALL) == 0 && !selection.is_empty() { + return Err("input selection given but no input field bits set"); + } + + if commit_number { + (tx.input.len() as u32).consensus_encode(&mut engine).unwrap(); + } + + if !selection.is_empty() && (inout_fields & TXFS_INPUTS_PREVOUTS) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + tx.input[*i].previous_output.consensus_encode(&mut engine).unwrap(); + } + sha256::Hash::from_engine(engine) + }; + engine.input(&hash[..]); + } + + if !selection.is_empty() && (inout_fields & TXFS_INPUTS_SEQUENCES) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + tx.input[*i].sequence.consensus_encode(&mut engine).unwrap(); + } + sha256::Hash::from_engine(engine) + }; + engine.input(&hash[..]); + } + + if !selection.is_empty() && (inout_fields & TXFS_INPUTS_SCRIPTSIGS) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + engine.input(&sha256::Hash::hash(&tx.input[*i].script_sig.as_bytes())[..]); + } + sha256::Hash::from_engine(engine) + }; + engine.input(&hash[..]); + } + + if !selection.is_empty() && (inout_fields & TXFS_INPUTS_PREV_SCRIPTPUBKEYS) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + engine.input(&sha256::Hash::hash(&prevouts[*i].script_pubkey.as_bytes())[..]); + } + sha256::Hash::from_engine(engine) + }; + engine.input(&hash[..]); + } + + if !selection.is_empty() && (inout_fields & TXFS_INPUTS_PREV_VALUES) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + prevouts[*i].value.consensus_encode(&mut engine).unwrap(); + } + sha256::Hash::from_engine(engine) + }; + engine.input(&hash[..]); + } + + if !selection.is_empty() && (inout_fields & TXFS_INPUTS_TAPROOT_ANNEXES) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + if prevouts[*i].script_pubkey.is_p2tr() { + if let Some(annex) = tx.input[*i].witness.taproot_annex() { + engine.input(&sha256::Hash::hash(annex)[..]); + } else { + engine.input(&SHA256_EMPTY[..]); + } + } else { + engine.input(&SHA256_EMPTY[..]); + } + } + sha256::Hash::from_engine(engine) + }; + engine.input(&hash[..]); + } + } + + if (global & TXFS_OUTPUTS) == 0 { + if (inout_fields & TXFS_OUTPUTS_ALL) != 0 { + return Err("outputs bit not set but some output field bits set"); + } + } else { + let (selection, commit_number) = parse_inout_selection( + &mut bytes, tx.output.len(), current_input_idx, + )?; + + if (inout_fields & TXFS_OUTPUTS_ALL) == 0 && !selection.is_empty() { + return Err("output selection given but no output field bits set"); + } + + if commit_number { + (tx.output.len() as u32).consensus_encode(&mut engine).unwrap(); + } + + if !selection.is_empty() && (inout_fields & TXFS_OUTPUTS_SCRIPTPUBKEYS) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + engine.input(&sha256::Hash::hash(&tx.output[*i].script_pubkey.as_bytes())[..]); + } + sha256::Hash::from_engine(engine) + }; + hash.consensus_encode(&mut engine).unwrap(); + } + + if !selection.is_empty() && (inout_fields & TXFS_OUTPUTS_VALUES) != 0 { + let hash = { + let mut engine = sha256::Hash::engine(); + for i in &selection { + tx.output[*i].value.consensus_encode(&mut engine).unwrap(); + } + sha256::Hash::from_engine(engine) + }; + hash.consensus_encode(&mut engine).unwrap(); + } + } + + Ok(sha256::Hash::from_engine(engine)) +} + +mod test_vectors { + use super::*; + use bitcoin::hex::DisplayHex; + use bitcoin::{Amount, ScriptBuf, Sequence, Witness}; + use bitcoin::blockdata::transaction::{self, TxIn}; + use bitcoin::opcodes::all::*; + + fn test_vector_tx() -> (Transaction, Vec) { + let tx = Transaction { + version: transaction::Version::TWO, + lock_time: bitcoin::absolute::LockTime::from_consensus(42), + input: vec![ + TxIn { + previous_output: "1111111111111111111111111111111111111111111111111111111111111111:1".parse().unwrap(), + script_sig: vec![0x23].into(), + sequence: Sequence::from_consensus(1), + witness: Witness::new(), + }, + TxIn { + previous_output: "2222222222222222222222222222222222222222222222222222222222222222:2".parse().unwrap(), + script_sig: ScriptBuf::new(), + sequence: Sequence::from_consensus(3), + witness: { // p2wsh annex-like stack element + let mut buf = Witness::new(); + buf.push(vec![0x13]); + buf.push(vec![0x14]); + buf.push(vec![0x50, 0x42]); // annex + buf + }, + }, + TxIn { + previous_output: "3333333333333333333333333333333333333333333333333333333333333333:3".parse().unwrap(), + script_sig: ScriptBuf::new(), + sequence: Sequence::from_consensus(2), + witness: { + let mut buf = Witness::new(); + buf.push(vec![0x12]); + buf + }, + }, + TxIn { + previous_output: "4444444444444444444444444444444444444444444444444444444444444444:4".parse().unwrap(), + script_sig: ScriptBuf::new(), + sequence: Sequence::from_consensus(3), + witness: { + let mut buf = Witness::new(); + buf.push(vec![0x13]); + buf.push(vec![0x14]); + buf.push(vec![0x50, 0x42]); // annex + buf + }, + }, + ], + output: vec![ + TxOut { + script_pubkey: vec![OP_PUSHNUM_6.to_u8()].into(), + value: Amount::from_sat(350), + }, + TxOut { + script_pubkey: vec![OP_PUSHNUM_7.to_u8()].into(), + value: Amount::from_sat(351), + }, + TxOut { + script_pubkey: vec![OP_PUSHNUM_8.to_u8()].into(), + value: Amount::from_sat(353), + }, + ], + }; + let prevs = vec![ + TxOut { + script_pubkey: vec![OP_PUSHNUM_16.to_u8()].into(), + value: Amount::from_sat(360), + }, + TxOut { + script_pubkey: vec![ // p2wsh + 0x00, 0x20, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + ].into(), + value: Amount::from_sat(361), + }, + TxOut { + script_pubkey: vec![ // p2tr + 0x51, 0x20, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + ].into(), + value: Amount::from_sat(361), + }, + TxOut { + script_pubkey: vec![ // p2tr + 0x51, 0x20, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + ].into(), + value: Amount::from_sat(362), + }, + ]; + (tx, prevs) + } + + #[derive(Debug)] + struct TestCase { + tx: Transaction, + prevs: Vec, + vectors: Vec + } + + #[derive(Debug)] + struct TestVector { + txfs: Vec, + input: usize, + codeseparator: Option, + txhash: sha256::Hash, + } + + fn generate_vectors() -> Vec { + let selectors: &[&[u8]] = &[ + // global + &[1 << 0], + &[1 << 1], + &[1 << 2], + &[1 << 3], + &[1 << 4], + &[0x9f], + // outputs + &[0xdf, TXFS_OUTPUTS_SCRIPTPUBKEYS, TXFS_INOUT_SELECTION_CURRENT], + &[0xdf, TXFS_OUTPUTS_VALUES, TXFS_INOUT_SELECTION_CURRENT], + &[0xdf, TXFS_OUTPUTS_ALL, TXFS_INOUT_SELECTION_CURRENT], + &[0xdf, TXFS_OUTPUTS_SCRIPTPUBKEYS, TXFS_INOUT_SELECTION_ALL], + &[0xdf, TXFS_OUTPUTS_VALUES, TXFS_INOUT_SELECTION_ALL], + &[0xdf, TXFS_OUTPUTS_ALL, TXFS_INOUT_SELECTION_ALL], + &[0xdf, TXFS_OUTPUTS_SCRIPTPUBKEYS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xdf, TXFS_OUTPUTS_VALUES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xdf, TXFS_OUTPUTS_ALL, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xdf, TXFS_OUTPUTS_SCRIPTPUBKEYS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xdf, TXFS_OUTPUTS_VALUES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xdf, TXFS_OUTPUTS_ALL, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xdf, TXFS_OUTPUTS_SCRIPTPUBKEYS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xdf, TXFS_OUTPUTS_VALUES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xdf, TXFS_OUTPUTS_ALL, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + // inputs + &[0xbf, TXFS_INPUTS_PREVOUTS, TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_SEQUENCES, TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_SCRIPTSIGS, TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_PREV_SCRIPTPUBKEYS, TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_PREV_VALUES, TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_TAPROOT_ANNEXES, TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_ALL, TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_PREVOUTS, TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_SEQUENCES, TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_SCRIPTSIGS, TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_PREV_SCRIPTPUBKEYS, TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_PREV_VALUES, TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_TAPROOT_ANNEXES, TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_ALL, TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_PREVOUTS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xbf, TXFS_INPUTS_SEQUENCES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xbf, TXFS_INPUTS_SCRIPTSIGS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xbf, TXFS_INPUTS_PREV_SCRIPTPUBKEYS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xbf, TXFS_INPUTS_PREV_VALUES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xbf, TXFS_INPUTS_TAPROOT_ANNEXES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xbf, TXFS_INPUTS_ALL, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xbf, TXFS_INPUTS_PREVOUTS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_SEQUENCES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_SCRIPTSIGS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_PREV_SCRIPTPUBKEYS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_PREV_VALUES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_TAPROOT_ANNEXES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_ALL, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xbf, TXFS_INPUTS_PREVOUTS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_SEQUENCES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_SCRIPTSIGS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_PREV_SCRIPTPUBKEYS, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_PREV_VALUES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_TAPROOT_ANNEXES, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xbf, TXFS_INPUTS_ALL, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + // both + &[0xff, 0xff, TXFS_INOUT_SELECTION_ALL, TXFS_INOUT_SELECTION_ALL], + &[0xff, 0xff, TXFS_INOUT_SELECTION_CURRENT, TXFS_INOUT_SELECTION_CURRENT], + &[0xff, 0xff, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_NONE], + &[0xff, 0xff, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_ALL], + &[0xff, 0xff, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_CURRENT], + &[0xff, 0xff, TXFS_INOUT_SELECTION_CURRENT, TXFS_INOUT_SELECTION_ALL], + &[0xff, 0xff, TXFS_INOUT_SELECTION_ALL, TXFS_INOUT_SELECTION_CURRENT], + // leading + &[0xff, 0xff, 0x01, 0x02], + // individual + &[0xff, 0xff, TXFS_INOUT_SELECTION_MODE | 0x01, 0x01, + TXFS_INOUT_SELECTION_MODE | 0x02, 0x00, 0x02], + &[0xff, 0xff, TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_MODE | 0x01, 0x01, + TXFS_INOUT_NUMBER | TXFS_INOUT_SELECTION_MODE | 0x02, 0x00, 0x02], + //TODO(stevenroose) test index size, but for that we need > 32 in/outputs + // special cases + &[], + &[0x00], + ]; + + let cases = vec![ + test_vector_tx(), + ]; + + let out_selector = |txfs: &[u8]| { + if txfs == &[0x00] || txfs.get(0)? & TXFS_OUTPUTS == 0 { + None + } else if txfs.get(0)? & TXFS_INPUTS == 0 { + Some(txfs[2]) + } else { + Some(txfs[3]) + } + }; + + cases.into_iter().map(|(tx, prevs)| { + let mut vectors = Vec::new(); + for txfs in selectors { + for i in 0..tx.input.len() { + if i >= tx.output.len() { + if let Some(outs) = out_selector(txfs) { + if (outs & (0xff ^ TXFS_INOUT_NUMBER)) == TXFS_INOUT_SELECTION_CURRENT { + continue; + } + } + } + + vectors.push(TestVector { + txfs: txfs.to_vec(), + input: i, + codeseparator: None, + txhash: calculate_txhash(txfs, &tx, &prevs, i as u32, None).unwrap(), + }); + } + } + TestCase { tx, prevs, vectors } + }).collect() + } + + pub fn write_vector_file(path: impl AsRef) { + use bitcoin::consensus::encode::serialize_hex; + + let ret = generate_vectors().into_iter().map(|c| serde_json::json!({ + "tx": serialize_hex(&c.tx), + "prevs": c.prevs.iter().map(|p| serialize_hex(p)).collect::>(), + "vectors": c.vectors.into_iter().map(|v| serde_json::json!({ + "txfs": v.txfs.as_hex().to_string(), + "input": v.input, + "codeseparator": v.codeseparator, + "txhash": v.txhash, + })).collect::>(), + })).collect::>(); + + let mut file = std::fs::File::create(path).unwrap(); + serde_json::to_writer_pretty(&mut file, &ret).unwrap(); + } +} + +fn main() { + test_vectors::write_vector_file("./txhash_vectors.json"); +} diff --git a/bip-txhash/ref-impl/txhash_vectors.json b/bip-txhash/ref-impl/txhash_vectors.json new file mode 100644 index 0000000000..b8f91972e0 --- /dev/null +++ b/bip-txhash/ref-impl/txhash_vectors.json @@ -0,0 +1,1591 @@ +[ + { + "prevs": [ + "68010000000000000160", + "69010000000000002200200100000000000000000000000000000000000000000000000000000000000000", + "69010000000000002251200100000000000000000000000000000000000000000000000000000000000000", + "6a010000000000002251200200000000000000000000000000000000000000000000000000000000000000" + ], + "tx": "02000000000104111111111111111111111111111111111111111111111111111111111111111101000000012301000000222222222222222222222222222222222222222222222222222222222222222202000000000300000033333333333333333333333333333333333333333333333333333333333333330300000000020000004444444444444444444444444444444444444444444444444444444444444444040000000003000000035e0100000000000001565f0100000000000001576101000000000000015800030113011402504201011203011301140250422a000000", + "vectors": [ + { + "codeseparator": null, + "input": 0, + "txfs": "01", + "txhash": "26b25d457597a7b0463f9620f666dd10aa2c4373a505967c7c8d70922a2d6ece" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "01", + "txhash": "26b25d457597a7b0463f9620f666dd10aa2c4373a505967c7c8d70922a2d6ece" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "01", + "txhash": "26b25d457597a7b0463f9620f666dd10aa2c4373a505967c7c8d70922a2d6ece" + }, + { + "codeseparator": null, + "input": 3, + "txfs": "01", + "txhash": "26b25d457597a7b0463f9620f666dd10aa2c4373a505967c7c8d70922a2d6ece" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "02", + "txhash": "e8a4b2ee7ede79a3afb332b5b6cc3d952a65fd8cffb897f5d18016577c33d7cc" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "02", + "txhash": "e8a4b2ee7ede79a3afb332b5b6cc3d952a65fd8cffb897f5d18016577c33d7cc" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "02", + "txhash": "e8a4b2ee7ede79a3afb332b5b6cc3d952a65fd8cffb897f5d18016577c33d7cc" + }, + { + "codeseparator": null, + "input": 3, + "txfs": "02", + "txhash": "e8a4b2ee7ede79a3afb332b5b6cc3d952a65fd8cffb897f5d18016577c33d7cc" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "04", + "txhash": "df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "04", + "txhash": "67abdd721024f0ff4e0b3f4c2fc13bc5bad42d0b7851d456d88d203d15aaa450" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "04", + "txhash": "26b25d457597a7b0463f9620f666dd10aa2c4373a505967c7c8d70922a2d6ece" + }, + { + "codeseparator": null, + "input": 3, + "txfs": "04", + "txhash": "9d9f290527a6be626a8f5985b26e19b237b44872b03631811df4416fc1713178" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "08", + "txhash": "5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c9456" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "08", + "txhash": "5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c9456" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "08", + "txhash": "5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c9456" + }, + { + "codeseparator": null, + "input": 3, + "txfs": "08", + "txhash": "d703d3da6a87bd8e0b453f3b6c41edcc9bf331b2b88ef26eb39dc7abee4e00a3" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "10", + "txhash": "ad95131bc0b799c0b1af477fb14fcf26a6a9f76079e48bf090acb7e8367bfd0e" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "10", + "txhash": "ad95131bc0b799c0b1af477fb14fcf26a6a9f76079e48bf090acb7e8367bfd0e" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "10", + "txhash": "ad95131bc0b799c0b1af477fb14fcf26a6a9f76079e48bf090acb7e8367bfd0e" + }, + { + "codeseparator": null, + "input": 3, + "txfs": "10", + "txhash": "ad95131bc0b799c0b1af477fb14fcf26a6a9f76079e48bf090acb7e8367bfd0e" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "9f", + "txhash": "4f248b4664d9b7eb78506ee3ae3d40f45b65b2c34f5472bb5e9c367770e7f1ee" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "9f", + "txhash": "634565d0889156efa4c3a932c6b832aaeac34af7e77245b1c1db8ed260ad4e1d" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "9f", + "txhash": "55d54935fbc0dbc572da8ad1eb47c9e3fc28449a070d59a4a2c180f6dc33b285" + }, + { + "codeseparator": null, + "input": 3, + "txfs": "9f", + "txhash": "51f86e7bb438301882176aa6dff4ba755fed8cf4d2948bf54bcd143bce135376" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "df4040", + "txhash": "295da1be3ab5d30bbdbc803ae25066922d0ad964dc08654fc14966d4636271c3" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "df4040", + "txhash": "76c6722f456306260a5c91037dfec2d5bd586ab1f21039216f74455150b221d4" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "df4040", + "txhash": "78cc0e2841fc0c261d98a577ec46af84c0a19ff2d39a9a9e31dec0a5bfab0f09" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "df8040", + "txhash": "563f4ebd7bb6f7f4313eaadab32a1e8b9f949227d0cde6b15712b0f26f25dd03" + }, + { + "codeseparator": null, + "input": 1, + "txfs": "df8040", + "txhash": "1b0b39caf5579978f8ad3542e58a5a5a02e328be0ab357153a7673108a7edf21" + }, + { + "codeseparator": null, + "input": 2, + "txfs": "df8040", + "txhash": "a145587dce2a85b50bdd085568062612ca3b1ebd4a4ad61f0c765799fd804195" + }, + { + "codeseparator": null, + "input": 0, + "txfs": "dfc040", + "txhash": "7a4f203d00749f677f7cb83043ac4eeb803099063cd01127aeb984bdc4632d7d" + }, + { + "codeseparator": null, + 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