Fix Payjoin: Add back original PSBT input to payjoin proposal #267
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Unlike Bitcoin Core's walletprocesspsbt RPC, BKD's finalize_psbt only checks if the script in the PSBT input map matches the descriptor and does not check whether it has control of the OutPoint specified in the unsigned_tx's TxIn. So the original_psbt input data needs to be added back into payjoin_psbt without overwriting receiver input. BIP 78 spec clears script data from payjoin proposal.
cryptoquick
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Jul 12, 2023
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DanGould
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Jul 12, 2023
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These changes still look fine. If any fixes need to be made, we can do them in a separate PR. I'll be sure to run CI checks on this as well. |
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I've invited you to the project with write access so your contributions can run in CI more easily. |
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Looks like there was a linter issue. I'm closing this for #269. |
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Unlike Bitcoin Core's walletprocesspsbt RPC, BDK's finalize_psbt only checks if the script in the PSBT input map matches the descriptor and does not check whether it has control of the OutPoint specified in the unsigned_tx's TxIn. BIP 78 spec clears script data from payjoin proposal. So the original_psbt input data needs to be added back into payjoin_psbt without overwriting receiver input.
See where we ran into the same problem with BDK-CLI and the proposed solution there.