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69 lines
3.3 KiB
Markdown
69 lines
3.3 KiB
Markdown
# PSBT Handling
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## Sample Unsigned
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From BIP174 docs.
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Uses `bitcoin-cli decodepsbt` to parse.
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txid is `fed6cd1fde4db4e13e7e800317e37f9cbd75ec364389670eeff80da993c7e560`
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```
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bitcoin-cli -rpcuser=__cookie__ -rpcpassword=9e0ca21c70d6b7307b750c8012d12df04ef77d0c5754abc29a3ae31304d946ce decodepsbt cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA
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```
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## TXID from PSBT
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```
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=btc -build-file %/lib/btc/hoon
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=psbt 'cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA'
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(get-txid:^psbt:btc psbt)
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:: gives [wid=%32 dat=0xfed6.cd1f.de4d.b4e1.3e7e.8003.17e3.7f9c.bd75.ec36.4389.670e.eff8.0da9.93c7.e560]
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```
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## Parse PSBT into Maps
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```
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=btc -build-file %/lib/btc/hoon
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=psbt 'cHNidP8BAKACAAAAAqsJSaCMWvfEm4IS9Bfi8Vqz9cM9zxU4IagTn4d6W3vkAAAAAAD+////qwlJoIxa98SbghL0F+LxWrP1wz3PFTghqBOfh3pbe+QBAAAAAP7///8CYDvqCwAAAAAZdqkUdopAu9dAy+gdmI5x3ipNXHE5ax2IrI4kAAAAAAAAGXapFG9GILVT+glechue4O/p+gOcykWXiKwAAAAAAAEHakcwRAIgR1lmF5fAGwNrJZKJSGhiGDR9iYZLcZ4ff89X0eURZYcCIFMJ6r9Wqk2Ikf/REf3xM286KdqGbX+EhtdVRs7tr5MZASEDXNxh/HupccC1AaZGoqg7ECy0OIEhfKaC3Ibi1z+ogpIAAQEgAOH1BQAAAAAXqRQ1RebjO4MsRwUPJNPuuTycA5SLx4cBBBYAFIXRNTfy4mVAWjTbr6nj3aAfuCMIAAAA'
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(parse:pbt:btc psbt)
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```
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## Make an HD Path
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```
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=btc -build-file %/lib/btc/hoon
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=hk [[%4 0x9ca7.9d5b] %bip84 %1 11]
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=pubkey [33 0x3.6093.e9e0.6a5f.736e.751f.5486.c1c6.7647.c258.b946.b314.d2d3.f03a.33c2.b5cf.b9ab]
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(hd-path:^psbt:btc pubkey %output hk)
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:: GIVES
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[ key=[wid=34 dat=0x203.6093.e9e0.6a5f.736e.751f.5486.c1c6.7647.c258.b946.b314.d2d3.f03a.33c2.b5cf.b9ab]
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val=[wid=21 dat=0x9c.a79d.5b54.0000.8000.0000.8000.0000.8001.0000.000b]]
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```
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## Making Derivation Paths
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Below is hex for `m/84'/0'/0'/0/0`
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`*80 is the ending for hardened paths*
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54.00.00.80 00.00.00.80 00.00.00.80 00.00.00.00 00.00.00.00.00`
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## CLI Debugging
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```
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bitcoin-cli -rpcuser=__cookie__ -rpcpassword=$(./rpc-password.sh) decodepsbt $PSBT
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```
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## ColdCard PSBT Export Structure
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If we don't have the master fingerprint, can probably fake it. It's not "load-bearing".
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Maps:
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1. 1 keyval
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- Raw tx hex
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2. 3 keyvals (Input)
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- Witness TX: {8byte amount}|{1 byte scriptpubkeylen}|{22byte scriptpubkey)}
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- Non Witness TX: 82 byte input tx
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- Wallet Derivation path.
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* Key: {0x6}|{33byte pubkey}
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* Val: {4byte master xpub fingerprint}|{17byte HD path}
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3. skips the main output for some reason, even though it's in raw tx hex.
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*skips* = double separator, I think
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**we can skip an ouput if the path is on someone else's ship**
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4. 1 keyval
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- Change output Wallet derivation path
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* Key: {0x2}|{33byte pubkey}
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* Val: {4byte master xpub fingerprint}|{17byte HD path}
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