mirror of https://github.com/zcash/zips.git
Note number of underscores in hash personalization strings.
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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@ -148,6 +148,8 @@ The personalization field of this hash is set to::
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"ZcashTxHash_" || CONSENSUS_BRANCH_ID
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"ZcashTxHash_" has 1 underscore character.
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As in ZIP 143 [#zip-0143]_, CONSENSUS_BRANCH_ID is the 4-byte little-endian encoding of
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the consensus branch ID for the epoch of the block containing the transaction. Domain
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separation of the transaction id hash across parallel consensus branches provides replay
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@ -302,7 +304,7 @@ in the hash::
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The personalization field of this hash is set to::
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"ZTxIdSOutC__Hash"
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"ZTxIdSOutC__Hash" (2 underscore characters)
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T.4a.ii: sapling_outputs_memos_digest
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.....................................
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@ -314,7 +316,7 @@ are included in the hash::
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The personalization field of this hash is set to::
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"ZTxIdSOutM__Hash"
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"ZTxIdSOutM__Hash" (2 underscore characters)
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T.4a.iii: sapling_outputs_noncompact_digest
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...........................................
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@ -363,9 +365,11 @@ The personalization field of this hash is set to::
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"ZcashTxHash_" || CONSENSUS_BRANCH_ID
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This value must have the same personalization as the top hash of the transaction
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identifier digest tree, in order to make it possible to sign the transaction id
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in the case that there are no transparent inputs.
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"ZcashTxHash_" has 1 underscore character.
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This value has the same personalization as the top hash of the transaction
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identifier digest tree, so that what is being signed in the case that there are
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no transparent inputs is just the transaction id.
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S.1: header_digest
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``````````````````
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@ -501,6 +505,8 @@ The personalization field of this hash is set to::
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"ZTxAuthHash_" || CONSENSUS_BRANCH_ID
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"ZTxAuthHash_" has 1 underscore character.
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A.1: transparent_scripts_digest
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```````````````````````````````
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A BLAKE2b-256 hash of the field encoding of the Bitcoin script associated
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@ -561,9 +567,9 @@ to the transaction data, including witnesses, that appear within the block.
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As a consequence, we now need to add a new commitment to the block header.
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This commitment will be the root of a Merkle tree that has parallel structure
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to the tree committed to by ``hashMerkleRoot`` (a path through this merkle
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to the tree committed to by ``hashMerkleRoot`` (a path through this Merkle
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tree to a transaction identifies the same transaction as that path reaches
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in the tree rooted at ``hashMerkleRoot``) but where the leaves are hashes
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in the tree rooted at ``hashMerkleRoot``), but where the leaves are hashes
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produced according to the `Authorizing Data Commitment` part of this
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specification.
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@ -617,4 +623,3 @@ References
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.. [#zip-0143] `ZIP 143: Transaction Signature Validation for Overwinter <zip-0143.rst>`_
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.. [#zip-0307] `ZIP 307: Light Client Protocol for Payment Detection <zip-0307.rst>`_
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.. [#protocol_consensus] `Zcash Protocol Specification, Version 2020.1.15. Section 7.1: Transaction Encoding and Consensus <protocol/protocol.pdf#txnencodingandconsensus>`_
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@ -118,6 +118,8 @@ The personalization field of this hash is set to::
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"ZcashTxHash_" || CONSENSUS_BRANCH_ID
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"ZcashTxHash_" has 1 underscore character.
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This value must have the same personalization as the top hash of the transaction
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identifier digest tree, in order to make it possible to sign the transaction id
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in the case that there are no transparent inputs.
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@ -135,7 +137,7 @@ input being signed::
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The personalization field of this hash is set to::
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"Zcash__TzeInHash"
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"Zcash__TzeInHash" (2 underscore characters)
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Authorizing Data Commitment
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---------------------------
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