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ZIP 244: Change semantics of `sequence_sig_digest` 

Co-authored-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Jack Grigg 2022-01-03 22:32:57 +00:00
parent 8572075604
commit 2442192519
1 changed files with 14 additions and 2 deletions
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16
zip-0244.rst
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@ -531,8 +531,7 @@ S.2b: sequence_sig_digest
This is a BLAKE2b-256 hash initialized with the personalization field value
``ZTxIdSequencHash``.
If the ``SIGHASH_ANYONECANPAY`` flag is not set, and the sighash type is neither
``SIGHASH_SINGLE`` nor ``SIGHASH_NONE``::
If the ``SIGHASH_ANYONECANPAY`` flag is not set::
identical to the value of ``sequence_digest`` as specified for the
transaction identifier in section T.2b.
@ -736,6 +735,17 @@ happens in the block that activates this ZIP.
The block header byte format and version are not altered by this ZIP.
=========
Rationale
=========
Several changes in this ZIP (relative to ZIP 243 [#zip-0243]_) were made to
align with BIP 341 [#bip-0341]_:
- The semantics of ``sequence_sig_digest`` were changed, to commit to ``nSequence``
even if ``SIGHASH_SINGLE`` or ``SIGHASH_NONE`` is set. The rationale for this
change is inherited from BIP 341 [#bip-0341-nSequence]_.
========================
Reference implementation
========================
@ -754,3 +764,5 @@ References
.. [#zip-0143] `ZIP 143: Transaction Signature Validation for Overwinter <zip-0143.rst>`_
.. [#zip-0243] `ZIP 243: Transaction Signature Validation for Sapling <zip-0243.rst>`_
.. [#zip-0307] `ZIP 307: Light Client Protocol for Payment Detection <zip-0307.rst>`_
.. [#bip-0341] `BIP 341: Taproot: SegWit version 1 spending rules <https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki>`_
.. [#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>`_