Historical retrospective · Bitcoin
BIP 174 standardized partially signed Bitcoin transactions
BIP 174 defines a data structure for passing an unsigned or partially signed transaction between wallets and signing devices.
PSBT workflows allow separate devices or participants to contribute signatures without each needing to share private keys.
The format improved coordination for hardware wallets, multisignature setups and offline signing.
A partially signed transaction should be inspected before final approval; separation of keys helps, but does not remove human-review requirements.
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