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1497b4127c
shrub/PSBT.md
timlucmiptev 1497b4127c PSBT docs; parse PSBTs
2021-05-26 18:30:14 -07:00

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PSBT Handling

Sample Unsigned

From BIP174 docs. Uses bitcoin-cli decodepsbt to parse. txid is fed6cd1fde4db4e13e7e800317e37f9cbd75ec364389670eeff80da993c7e560

bitcoin-cli -rpcuser=__cookie__ -rpcpassword=9e0ca21c70d6b7307b750c8012d12df04ef77d0c5754abc29a3ae31304d946ce decodepsbt cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA

TXID from PSBT

=btc -build-file %/lib/btc/hoon
=psbt 'cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA'

(get-txid:^psbt:btc psbt)
::  gives [wid=%32 dat=0xfed6.cd1f.de4d.b4e1.3e7e.8003.17e3.7f9c.bd75.ec36.4389.670e.eff8.0da9.93c7.e560]

Parse PSBT into Maps

=btc -build-file %/lib/btc/hoon
=psbt 'cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA'

(parse:^psbt:btc psbt)

Making Derivation Paths

Below is hex for m/84'/0'/0'/0/0 *80 is the ending for hardened paths* 54.00.00.80 00.00.00.80 00.00.00.80 00.00.00.00 00.00.00.00.00

ColdCard PSBT Export Structure

If we don't have the master fingerprint, can probably fake it. It's not "load-bearing".

Maps:

  1. 1 keyval
  • Raw tx hex
  1. 3 keyvals (Input)
  • Witness TX: {8byte amount}|{1 byte scriptpubkeylen}|{22byte scriptpubkey)}
  • Non Witness TX: 82 byte input tx
  • Wallet Derivation path.
    • Key: {0x6}|{33byte pubkey}
    • Val: {4byte master xpub fingerprint}|{17byte HD path}
  1. skips the main output for some reason, even though it's in raw tx hex
  2. 1 keyval
  • Change output Wallet derivation path
    • Key: {0x2}|{33byte pubkey}
    • Val: {4byte master xpub fingerprint}|{17byte HD path}