pczt: Add public getter for shielded sighash#21
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Backports the `Signer::shielded_sighash` accessor from main (added in zcash#2047) to the 0.5.x series, enabling downstream consumers to obtain the sighash for producing signatures externally (e.g. via a hardware wallet). Made-with: Cursor
czarcas7ic
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Apr 10, 2026
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Based on
maint/pczt-0.5.x(branched frompczt-0.5.0series). This is aSemVer-compatible addition intended for a
0.5.xpoint release.Backports the
Signer::shielded_sighashaccessor from main (added in zcash#2047) to the 0.5.x series, enabling downstream consumers to obtain the sighash for producing signatures externally (e.g. via a hardware wallet).How We Use It
Token Holder Voting.
We use
shielded_sighash()to extract the ZIP-244 transaction digest from the finalized PCZT so that both signing paths (software key derivation and Keystone hardware) produce a spend-auth signature over the same canonical hash.See full summary of the integration: https://hackmd.io/@TJGUVkqNQYieiMqJQQBDeA/rJ0mU1v3Wl