wallet-exercises.adoc

Exercises

exercise-intro.adoc

1. Modify a wallet RPC

   • ❏ Create a descriptor wallet

   • ❏ Generate coins to yourself

   • ❏ Remove the "dummy" parameter from the getbalance Wallet RPC

   • ❏ Ensure that the rpc_help.py functional test passes (but ignore other test failures), fixing any errors

     Tip	run test/functional/rpc_help.py to just run a single test

   • ❏ Check that the rpc call getbalance 3 true true passes with the dummy parameter removed

1. IsMine

   • ❏ Create a descriptor wallet

   • ❏ Generate coins to yourself

   • ❏ Send coins to yourself in a transaction and generate a block to confirm

   • ❏ Modify the wallet’s IsMine() logic to always return false

   • ❏ Generate a new block and try to send coins to yourself in a transaction again

   • Observe the changes

2. Coin Selection

   • ❏ Create a descriptor wallet

   • ❏ Generate 200 blocks to yourself

   • ❏ Call listunspent and then send a large amount (e.g. 600 BTC) to yourself and observe how many inputs were used

   • ❏ Add a new preferred coin selection algorithm to the wallet that uses all UTXOs in the wallet and optionally remove the other algorithms.

   • ❏ Redo the send and confirm that this time it will select all inputs in the wallet for the transaction

3. Adding a new RPC

   • ❏ Add a new RPC which when called will simply return to the user a random UTXO from the wallet in the form

     {
       "txid": <txid>,
       "vout": <vout>
     }