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feat(dash)!: stable txid for version 2 asset unlocks, instance hash and MSG_ASSET_UNLOCK - #1157
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The title clearly summarizes the main changes: stable transaction IDs for version 2 asset unlocks, the new instance hash, and the MSG_ASSET_UNLOCK inventory message. |
| Linked Issues check | |
The PR satisfies the coding requirements in #1134. Transaction::txid() applies stable hashing to eligible asset unlock payloads and zeroes the 132-byte quorum data. Transaction::instance_hash() ha… |
| Out of Scope Changes check | |
The reviewed changes stay within #1134. The serialization refactor supports txid() and instance_hash(). The constants, inventory variant, and tests directly support the requested asset unlock beha… |
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Docstring coverage is 93.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 3 files. |
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## dev #1157 +/- ##
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+ Coverage 78.73% 78.76% +0.03%
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Files 302 302
Lines 80560 80644 +84
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+ Hits 63426 63517 +91
+ Misses 17134 17127 -7
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Review comments at @dash/src/blockdata/transaction/mod.rs:
- Line 242: Update the documentation for txid() and wtxid() to clarify that
their hashes can differ without witnesses for version 2+ asset unlock
transactions: txid() zeroes the quorum-info suffix, while wtxid() hashes the
unmodified transaction. State that wtxid() is not a stable unlock ID.
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📒 Files selected for processing (2)
dash/src/blockdata/transaction/mod.rsdash/src/blockdata/transaction/special_transaction/asset_unlock/qualified_asset_unlock.rs
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…nd MSG_ASSET_UNLOCK For an asset unlock with payload version 2 or higher, txid() zeroes the trailing quorum signing info before hashing, as Core does, so every re-signed instance of one withdrawal shares one txid. Like Core, the rule is judged from the payload bytes, so a payload kept raw counts too. instance_hash() returns the full-serialization hash. Adds inv type 34 (MSG_ASSET_UNLOCK) and the DIP-0027 txid vectors from Core's evo_assetunlock test. Closes #1134 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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`Transaction::deserialize_ignoring_asset_lock_payload_length` decodes an asset lock as this crate did before special payloads were read strictly through their length prefix (#1154): the prefix must be a minimal CompactSize, its value is ignored, and the payload must end the bytes. Any other transaction goes to `deserialize`. Dash Platform needs it for instant asset lock proofs. Neither the InstantSend lock (checked against the re-encoded txid) nor the transition signature covers the prefix, and Platform releases built on earlier pins accepted and charged for proofs whose prefix differs from the payload length. Platform v5.0.0-rc.1 restored that with a byte-level workaround on its side (dashpay/platform#5403); this gives it a named, frozen decoder. The function is standalone rather than a mode of `Decodable for Transaction`, and writes the payload layout out instead of calling `AssetLockPayload::consensus_decode`, so a later transaction rule or a new asset lock payload layout cannot change what it accepts. It makes the same finite-reader calls as the transaction decoder. `dash/tests/legacy_asset_lock.rs` pins absolute results (fixed bytes, txids, error variants): 1/3/5/9-byte prefixes, versions 4 and 0x7fff, the witness form (including a witness on one of two inputs) and the zero-input form, a long payload read after a short prefix, a payload without credit outputs, payload versions 0/2/3/255 with appended fields counted by the prefix or not, and the refusals (non-minimal prefix or credit-output count, truncation, trailing bytes, segwit flags 0 and 2, a classic transaction). A coinbase, a ProRegTx, an unknown type and type 8 below version 3 are checked against `deserialize`, and a seeded round-trip property covers mutated inputs. Each of these changes to the function turns tests red: delegating everything to `deserialize` (22 of 46), dropping the segwit rule (12), checking `any` instead of `all` witnesses empty (2), accepting only version 3 (2), comparing the version unsigned (1), refusing empty credit outputs (2), dropping the trailing-bytes check (6). A differential run against Platform's workaround over 16M seeded mutations, on dev and on 7302d0a, found no Ok/Err, decoded-transaction or error mismatch. Adapted for this branch: the `AssetLockPayload` import no longer sits next to the `AssetUnlockPayload` import from #1157, which this branch does not have, and the tests decode hex with `hex`, since `hex-conservative` is not a dependency here. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit 28c1a04)
`Transaction::deserialize_ignoring_asset_lock_payload_length` becomes `Transaction::deserialize_with_legacy_asset_lock_framing` and moves to `dash/src/blockdata/transaction/legacy_asset_lock.rs`. The transaction module keeps only the `mod` line. The name and the doc comments now say plainly that this is a legacy decoder whose framing must never change. It is neither `#[deprecated]` nor behind a cargo feature: Dash Platform has to call it for as long as it must agree with its older binaries and replay its chain, so there is nothing to migrate to, and a feature would only allow building Platform without it. The function body is byte-for-byte the one it replaces. The 46 tests in `dash/tests/legacy_asset_lock.rs` pass with only the name changed. No red/green step applies: nothing behaves differently. Adapted for this branch: the removed `AssetLockPayload` import no longer sits next to the `AssetUnlockPayload` import from #1157, which this branch does not have. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> (cherry picked from commit f9f195c)
Closes #1134. Part of #1047.
Transaction::txid(): for an asset unlock with payload version >= 2, the trailing 132 bytes (request_height,quorum_hash,quorum_sig) are zeroed before hashing, as Core'sComputeStableUnlockHash. Re-signed instances of one withdrawal share one txid. Every other transaction hashes as before.Transaction::instance_hash(): the full-serialization hash, equal totxid()except for version 2+ unlocks. Core relays those and commits to them in the CbTx by this hash.AssetUnlockPayload::STABLE_TXID_VERSIONandQUORUM_INFO_SIZE.Inventory::AssetUnlockfor inv type 34 (MSG_ASSET_UNLOCK).evo_assetunlock, txid invariance across re-signs, inv type 34 round trip.Behaviour change of
txid():Block::compute_merkle_root()/check_merkle_root()follow, matching Core. Platform signs the withdrawal vote extension overtxid()of the unsigned unlock. For version 2 it must useinstance_hash()of the unsigned unlock instead, which is the hash Core verifies (onlyquorum_sigzeroed). See dashpay/platform#5315.Draft until Platform is coordinated.
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cbebc03/skip-botsproceeds without the ones not yet reported/self-revieweddash/src/blockdata/transaction/mod.rs,dash/src/blockdata/transaction/special_transaction/asset_unlock/qualified_asset_unlock.rs,dash/src/network/message_blockdata.rs) — QuantumExplorer or xdustinfaceWhen every merge requirement is met, the
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