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BIP375: fixes to Updater role #2120

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BIP375: fixes to Updater role #2120

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f208b9d
BIP375: replace public keys by private keys to create ECDH in phrase
nymius Mar 12, 2026
7d7e034
BIP375: add PSBT_IN_TAP_BIP32_DERIVATION in Updater role
nymius Mar 12, 2026
6838026
BIP375: specify format for zeroing derivation data in Updater role
nymius Mar 12, 2026
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7 changes: 6 additions & 1 deletion bip-0375.mediawiki
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Expand Up @@ -164,7 +164,12 @@ Outputs with PSBT_OUT_SP_V0_INFO set may only be added if there are no inputs sp

===Updater===

The updater should add a PSBT_IN_BIP32_DERIVATION for any p2wpkh, p2sh-p2wpkh, or p2pkh input so the public key is available for creating the ecdh_shared_secret when the private key is not known. If the updater does not want to reveal the fingerprint or derivation path, it can set the value of the field to zero.
For any p2wpkh, p2sh-p2wpkh or p2pkh input the updater should add a PSBT_IN_BIP_32_DERIVATION.
For any p2tr input which has internal private key the updater should add a PSBT_IN_TAP_BIP32_DERIVATION.

This must be done to allow the signer find the private keys to create the PSBT_IN_ECDH_SHAREs.

If the updater does not want to reveal the fingerprint or derivation path, it can set the value to a 4-byte zero fingerprint with no derivation paths.

====Change Detection====

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