mirror of https://github.com/zcash/zips.git
ZIP 244: Change semantics of `sequence_sig_digest`
Co-authored-by: Daira Hopwood <daira@jacaranda.org>
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zip-0244.rst
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zip-0244.rst
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@ -531,8 +531,7 @@ S.2b: sequence_sig_digest
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This is a BLAKE2b-256 hash initialized with the personalization field value
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``ZTxIdSequencHash``.
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If the ``SIGHASH_ANYONECANPAY`` flag is not set, and the sighash type is neither
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``SIGHASH_SINGLE`` nor ``SIGHASH_NONE``::
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If the ``SIGHASH_ANYONECANPAY`` flag is not set::
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identical to the value of ``sequence_digest`` as specified for the
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transaction identifier in section T.2b.
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@ -736,6 +735,17 @@ happens in the block that activates this ZIP.
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The block header byte format and version are not altered by this ZIP.
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=========
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Rationale
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=========
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Several changes in this ZIP (relative to ZIP 243 [#zip-0243]_) were made to
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align with BIP 341 [#bip-0341]_:
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- The semantics of ``sequence_sig_digest`` were changed, to commit to ``nSequence``
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even if ``SIGHASH_SINGLE`` or ``SIGHASH_NONE`` is set. The rationale for this
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change is inherited from BIP 341 [#bip-0341-nSequence]_.
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========================
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Reference implementation
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========================
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@ -754,3 +764,5 @@ References
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.. [#zip-0143] `ZIP 143: Transaction Signature Validation for Overwinter <zip-0143.rst>`_
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.. [#zip-0243] `ZIP 243: Transaction Signature Validation for Sapling <zip-0243.rst>`_
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.. [#zip-0307] `ZIP 307: Light Client Protocol for Payment Detection <zip-0307.rst>`_
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.. [#bip-0341] `BIP 341: Taproot: SegWit version 1 spending rules <https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki>`_
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.. [#bip-0341-nSequence] `Why does the signature message commit to all input nSequence if SIGHASH_SINGLE or SIGHASH_NONE are set? <https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki#cite_note-18>`_
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