feat: version 2 asset unlocks with stable txids and InstantSend locks (DIP-0027 amendment, v24)

[PastaPastaPasta]

Issue being fixed or feature implemented

Users want Platform→Core withdrawals to be rapidly respendable with InstantSend finality. Today that is impossible: an Asset Unlock can expire before it is mined, Platform then re-signs the withdrawal, and because the re-signed transaction has a different txid, any transaction spending the unmined unlock's outputs is invalidated — so spends of unmined unlocks can never be islocked.

This PR implements version 2 Asset Unlock transactions (spec: dashpay/dips#189), activating with DEPLOYMENT_V24: the txid itself is computed with the quorum signing info (requestedHeight, quorumHash, quorumSig) zeroed — exactly and provably the only fields Platform changes when it re-signs an expired withdrawal. Every re-signed instance of one withdrawal is therefore the same transaction: children reference one stable txid forever and survive expiry and re-signing. This is segwit's txid/wtxid split applied to the quorum-sig fields — no aliasing in the mempool, UTXO set, or wallet layers; the spending model stays completely standard.

On top of that, the unlock itself is InstantSend-locked as soon as it can be mined in the next block, using its withdrawal index as a synthetic input. An islock attests "this will be mined and nothing in consensus prevents it"; for an unlock that holds as long as Platform keeps re-signing, which it is obligated to do (there is no refund path), and signing only minable-now instances makes any failure a double fault. Once locked, the withdrawal is like any other locked transaction: children are ordinary islocked spends, the wallet trusts its outputs, and Platform→Core transfers become rapidly respendable.

What was done?

Consensus — hashing rule (primitives/transaction, evo/assetlocktx)

• v2 payloads are serialized byte-identically to v1; the version byte (gated on v24, bad-assetunlocktx-version-2, mirroring Asset Lock v2) changes hashing: the txid zeroes the trailing 132 payload bytes. The full-serialization hash remains available as GetInstanceHash() (cached member, equal to the txid for every other transaction).
• The signed message hash is unchanged — it zeroes only quorumSig and still commits to requestedHeight/quorumHash — and is now computed explicitly from the full serialization (using GetHash() on the sig-zeroed copy would silently zero all three fields under the new rule). Signature validity rules (48-block window, active-quorum-set+1 recency) are identical to v1.

Consensus — coinbase commitment (evo/cbtx, validation, node/miner, blockencodings)

• v2 txids exclude the sig bytes, so the block merkle root no longer commits to them. CbTx version 4 (required post-v24) adds merkleRootAssetUnlocks: the merkle root over the instance hashes of the block's v2 unlocks (null when none). Verified in CheckMerkleRoot as a mutation check (bad-cbtx-assetunlockmerkleroot, BLOCK_MUTATED), mirroring segwit's witness commitment: a middleman can flip sig bytes without breaking the merkle root, and treating that as invalidity would let it poison an honest block's hash.
• Compact block short IDs are computed from instance hashes (BIP152v2's wtxid move): a mempool entry holding a different re-signed instance of a mined withdrawal is requested via getblocktxn instead of being spliced into the reconstructed block; FillBlock's existing IsBlockMutated check backstops short-ID collisions.

Mempool (validation, txmempool, node/transaction, node/miner)

• A re-signed instance shares the entry's txid; ATMP routes it through a refresh path that fully validates it and, when requestedHeight is higher, swaps the CTransactionRef in place — descendants, ancestry, and fee accounting untouched because everything the txid covers is identical. Stale/duplicate instances are rejected (assetunlock-stale-instance). sendrawtransaction submits refreshes instead of short-circuiting on the known txid.
• v2 unlocks are not expiry-evicted: an expired instance waits in the mempool for its replacement, so children never die with it; the miner instead skips instances that aren't currently minable. Since unlocks have no inputs, a new outputs-already-known check prevents an already-mined instance from re-entering (and, for v2, lingering).
• The mempool tracks the pending withdrawal total (outputs + fee of every unlock it holds, the quantity the credit pool charges) and a withdrawal-index map. The credit pool limit is enforced only at block connect, so this is what lets InstantSend tell an over-limit unlock from a minable one. Exposed as getmempoolinfo.pendingassetunlocks. Mining any instance of a withdrawal evicts every other instance claiming its index.
• At most one claimant per withdrawal index is held: a second unlock claiming an index under a different txid (a v1 instance signed pre-fork re-signed as v2 post-fork, or a Platform fault) is rejected as assetunlock-stale-instance unless its requestedHeight is higher, in which case it evicts the held claimant and its descendants, mirroring the in-place refresh. Checked before signature verification. The credit pool lookup in ATMP is wrapped: a local reconstruction failure is a TX_BAD_SPECIAL rejection (no peer punishment) and EvoDB corruption an error state, never an escaped exception.

InstantSend (instantsend/*, validation)

• The v2 unlock itself is islocked, not just its children. Unlocks have no inputs, so the lock pins one synthetic outpoint: {DIP-27 request id = SHA256d("plwdtx" ‖ index), 0} (instantsend::GetLockInputs). Every instance of one withdrawal, whatever its version or txid, maps to that outpoint, so a lock binds the index to one txid, any other claimant conflicts through the ordinary outpoint conflict path, and a re-sign (same txid) leaves the lock intact. Wire format unchanged.
• Masternodes sign the lock only when the unlock is minable in the next block (CheckCanLockAssetUnlock): stable-txid instance, passes the full special-tx check at the tip including its quorum signature, no other instance of its index in the mempool (a withdrawal signed as v1 pre-fork can be re-signed as v2 post-fork under a different txid), and the mempool's pending withdrawal total fits the credit pool's current limit. Platform pools withdrawals under the same limit, so a pending total above it indicates a fault and nothing is signed until the window clears. Both the height window and the limit move with the tip, so every tracked unmined unlock is re-evaluated on each connected block; a refresh re-triggers an attempt too.
• Consequences that fall out for free: children are ordinary islocked spends (the rev-3 CheckCanLock exception is gone), the wallet trusts a locked withdrawal's outputs via IsTxLockedByInstantSend, and the mempool's time-based expiry already spares locked transactions.
• Every vin.empty() early-out in InstantSend (including the IS-DB block hooks that mark locks mined and the block-connect conflict filter) goes through HasLockInputs. A peer islock on an unlock whose inputs are anything but the synthetic outpoint is dropped. Mined unlocks are tracked but not locked retroactively, since ChainLocks never wait for them.
• getassetunlockstatuses reports instantlock for mempooled indexes.

P2P relay (net_processing, protocol, version)

• txid-based announcement can never propagate a refresh (known-txid dedup; rejects-filter poisoning). New MSG_ASSET_UNLOCK inventory type (protocol 70242) announces v2 unlocks by instance hash; getdata is answered with a plain tx message; requests and the rejects filter are tracked per instance. Older peers get a MSG_TX announcement of the current instance and never see refreshes.

RPC & signing tooling (core_write, rpc/quorums, llmq/signing*)

• instanceHash in v2 unlock JSON. platformsign allows re-signing a request id with a different message hash (truncating the prior recovered sig so the new session isn't short-circuited), and ProcessRecoveredSig lets a fresher recovered sig supersede the stored one for the platform quorum type — Platform legitimately re-signs one request id with changing message hashes. Production Platform signing (Tenderdash vote extensions) is unaffected; this aligns Core's local signing path used by tests/tooling.

Tests

• Unit: txid invariance across the signing fields (and only those), CMutableTransaction agreement, msgHash semantics, v1 hashing unchanged, DIP-0027 worked-example vectors, CbTx unlock-root calculation.
• Unit: lock inputs of an unlock (synthetic outpoint, same for every version/instance of an index, distinct per index; ordinary txs / commitments / coinbase unchanged); mempool pending amount and index map across add, refresh, cross-version duplicate, index-conflict eviction and removal.
• Unit: ATMP rejects a staler claimant of a held withdrawal index before signature verification; credit pool snapshot persisted at a snapshot height when block assembly constructed the pool first; InstantSend tracker drops an unlocked unlock removed from the mempool and hands a queued unlock out once per trigger.
• Functional (feature_asset_locks.py): pre-fork v2 rejection; spend of an unmined v2 unlock by its stable txid; refresh in place (same txid, child untouched, instanceHash rotates); MSG_ASSET_UNLOCK inv observed for both the initial instance and the refresh; stale-instance rejection; survival of the expired instance + child; window clearing; fresh re-sign mined together with the child; CbTx v4 commitment asserted against the mined instance hash. With InstantSend enabled: the unlock is not locked while the pending total exceeds the limit (an ordinary tx is), the wallet does not trust the child's output, the re-signed minable instance within the limit is locked with the withdrawal index as its single input, the child is then locked through the ordinary path and trusted by the wallet, and a second withdrawal refused on the limit is locked by the per-block retry once the window clears and it is refreshed. Cross-version claimants: a v2 instance signed at the same height as the held v1 instance is rejected, a v2 unlock wrapped in a dstx message goes through DSTX validation and is dropped, and a v2 instance signed one block later replaces the v1 claimant and gets locked.

How Has This Been Tested?

• feature_asset_locks.py passes locally (macOS arm64) including the extended test_asset_unlock_v2 scenario; also feature_llmq_is_retroactive.py, feature_llmq_is_cl_conflicts.py, feature_llmq_chainlocks.py, feature_llmq_singlenode.py, feature_notifications.py, rpc_netinfo.py, p2p_dstx.py, feature_protx_version.py, mempool_unbroadcast.py, interface_rest.py, wallet_basic.py.
• Full test_dash unit suite passes.
• Lints: circular dependencies (two new expected entries registered), whitespace, python, assertions.
• The DIP worked-example vectors produced by dip-0027/dip-0027-txid-calc.py match Core's hashing byte-for-byte (pinned in a unit test).

Breaking Changes

• Consensus (v24 EHF, inactive until params are set): v2 Asset Unlock payloads become acceptable and CbTx v4 becomes required once v24 activates; before activation both are rejected. This must be code-complete before the v24 EHF parameters (bit 12, currently NEVER_ACTIVE) are finalized.
• Hashing: for v2 unlocks (which cannot exist pre-fork), txid ≠ H(full serialization). Light clients verifying merkle proofs for these transactions and explorer libraries computing txids from raw bytes need the one scoped rule; SPV output tracking and spending are otherwise completely standard.
• P2P: protocol bumped to 70242 for the MSG_ASSET_UNLOCK inventory type.

Known follow-ups (deliberately out of scope):

• Platform-side emitter PR (payload version byte + deterministic v24 gate on core_chain_locked_height); Platform's Tenderdash signing already produces the unchanged message hash.
• Restart gap: LoadMempool re-runs acceptance, so an expired v2 instance (and its children) is dropped on restart until the refresh arrives; the islock itself is persisted in the IS DB and wallet rebroadcast heals it. Accepting an expired instance whose txid is islocked on reload is a possible refinement.
• Ecosystem: anything computing txids from raw bytes (rust-dashcore Transaction::txid(), dash-spv, DashSync, dashj, explorers) needs the scoped v2 rule before activation.
• p2p-level regression tests for the legacy-peer (<70242) MSG_TX announcement path and for the rejects-filter poisoning scenario a rejected instance is announced over p2p, then a fresh instance must still propagate. The current functional test exercises the mempool refresh and MSG_ASSET_UNLOCK inv end-to-end but drives the stale-instance rejection via sendrawtransaction.
• The wallet keeps whatever instance it first saw (AddToWallet is a no-op on a known txid), so gettransaction may show a stale instance's requestedHeight/quorumSig; ZMQ/index consumers do observe each refresh. No fund-safety impact (outputs are identical across instances).
• TryAssetUnlockRefresh is wired into single-tx acceptance only; a refresh submitted via package acceptance would be rejected as a duplicate txid (safe, and not a path Platform/RPC uses).

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation (docs(dip27): version 2 Asset Unlock transactions with stable txids and InstantSend locks dips#189)
• I have assigned this pull request to a milestone

🤖 Generated with Claude Code

[knst]

CI failed because:

txmempool.cpp:690:13: error: reading variable 'mapAssetUnlockWithdrawalIds' requires holding mutex 'cs' [-Werror,-Wthread-safety-analysis]
  690 |             mapAssetUnlockWithdrawalIds.insert_or_assign(*withdrawal_id, tx_hash);
      |             ^
txmempool.cpp:691:13: error: calling function 'linkAssetUnlockChildren' requires holding mutex 'cs' exclusively [-Werror,-Wthread-safety-analysis]
  691 |             linkAssetUnlockChildren(newit, *withdrawal_id);
      |             ^
txmempool.cpp:792:27: error: reading variable 'mapAssetUnlockWithdrawalIds' requires holding mutex 'cs' [-Werror,-Wthread-safety-analysis]
  792 |             if (auto it = mapAssetUnlockWithdrawalIds.find(*withdrawal_id);
      |                           ^
txmempool.cpp:793:23: error: reading variable 'mapAssetUnlockWithdrawalIds' requires holding mutex 'cs' [-Werror,-Wthread-safety-analysis]
  793 |                 it != mapAssetUnlockWithdrawalIds.end() && it->second == tx_hash) {
      |                       ^
txmempool.cpp:794:17: error: reading variable 'mapAssetUnlockWithdrawalIds' requires holding mutex 'cs' [-Werror,-Wthread-safety-analysis]
  794 |                 mapAssetUnlockWithdrawalIds.erase(it);
      |                 ^
5 errors generated.

[github-actions]

This pull request has conflicts, please rebase.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-12T01:39:53.913835Z	991c9ff	New commits

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[github-actions]

Potential PR merge conflicts

This is advisory only. It does not block CI, but it marks PRs that will likely need a rebase depending on merge order.

If this PR merges first

These open PRs will likely need a rebase:

• #7437: feat!: implement Decentralized Masternode Shares DIP Changed files: src/Makefile.am, src/core_write.cpp, src/evo/assetlocktx.cpp, src/evo/core_write.cpp, src/evo/specialtxman.cpp, src/node/miner.cpp, src/primitives/transaction.h, src/rpc/json_help.cpp, src/rpc/rawtransaction.cpp, src/txmempool.cpp, src/validation.cpp.
• #7666: backport: bitcoin#19909, #21576, #23319, #24865, #26213, #26265, #26289, #26598, #26734, #26750 Changed files: src/blockencodings.cpp, src/core_write.cpp, src/net_processing.cpp, src/node/miner.cpp, src/primitives/transaction.cpp, src/primitives/transaction.h, src/protocol.cpp, src/protocol.h, src/rpc/mempool.cpp, src/rpc/rawtransaction.cpp, src/test/util/setup_common.cpp, src/txmempool.cpp, and 4 more.

If these PRs merge first

This PR will likely need a rebase:

• #7437: feat!: implement Decentralized Masternode Shares DIP Changed files: src/Makefile.am, src/core_write.cpp, src/evo/assetlocktx.cpp, src/evo/core_write.cpp, src/evo/specialtxman.cpp, src/node/miner.cpp, src/primitives/transaction.h, src/rpc/json_help.cpp, src/rpc/rawtransaction.cpp, src/txmempool.cpp, src/validation.cpp.
• #7666: backport: bitcoin#19909, #21576, #23319, #24865, #26213, #26265, #26289, #26598, #26734, #26750 Changed files: src/blockencodings.cpp, src/core_write.cpp, src/net_processing.cpp, src/node/miner.cpp, src/primitives/transaction.cpp, src/primitives/transaction.h, src/protocol.cpp, src/protocol.h, src/rpc/mempool.cpp, src/rpc/rawtransaction.cpp, src/test/util/setup_common.cpp, src/txmempool.cpp, and 4 more.

[thepastaclaw]

⛔ Final review complete — 2 blocking finding(s) (commit 991c9ff) · triage: critical · Phase 2 only (queue backlog)

[PastaPastaPasta]

PastaClaw, please prioritize review of this PR now that it has been rebased onto the latest develop and force-pushed. The local build and targeted unit/lint checks pass; please review the rebased tip and call out any required changes.

---

🤖 Posted autonomously by Codex on behalf of pasta.

[PastaPastaPasta]

[x] Request priority review

Please move this review to the front of the queue now that the PR has been rebased and validated.

---

🤖 Posted autonomously by Codex on behalf of pasta.

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• src/instantsend/instantsend.cpp
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• src/validation.cpp
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---

Walkthrough

Version 2 Asset Unlock transactions now use stable transaction IDs and separate instance hashes. The change updates validation, InstantSend lock inputs, mempool replacement, peer relay, mining, RPC output, and test coverage. Protocol version 70242 adds MSG_ASSET_UNLOCK announcements keyed by instance hash. CbTx version 4 commits to Asset Unlock instance hashes.

Priority: ➖ Normal

Estimated code review effort: 5 (Critical) | ~90 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Peer
  participant PeerManager
  participant Mempool
  participant InstantSend
  participant Miner
  Peer->>PeerManager: Announce MSG_ASSET_UNLOCK by instance hash
  PeerManager->>Mempool: Request and accept transaction
  Mempool->>InstantSend: Submit canonical lock input
  InstantSend-->>Mempool: Record InstantSend lock
  Miner->>Mempool: Select minable Asset Unlock
  Miner->>Miner: Commit instance hashes in CbTx

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Merge Risk: ⚪ Minimal · up to 02f9e

The Asset Unlock v2 changes have no identified merge-blocking risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 16.03% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 156 functions across 43 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely identifies the main change: version 2 Asset Unlocks with stable transaction IDs and InstantSend locks under v24.
Description check	✅ Passed	The description is directly related to the changeset and explains the consensus, mempool, InstantSend, relay, RPC, compatibility, and testing changes in sufficient detail.

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Actionable comments posted: 5

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Inline comments:
In `@src/evo/evodb.h`:
- Line 125: Update HasActiveTransaction() to return true only when called from
the thread that owns the active transaction; otherwise return false, while
preserving the existing active_transaction.has_value() behavior for the owning
thread.

In `@src/llmq/signing.cpp`:
- Line 552: Update TruncateRecoveredSig and both of its call sites to pass
deleteTimeKey=true when removing the recovered signature, ensuring the stale
rs_t entry is deleted while rs_h and rs_s are retained.

In `@src/test/evo_assetlocks_tests.cpp`:
- Around line 662-664: Strengthen the assertions after
ReplaceAssetUnlockInstance by verifying that unlock_v2 and unlock_v2_resigned
have different instance hashes, then retrieve the mempool transaction using its
stable transaction ID and assert its instance hash equals
unlock_v2_resigned->GetInstanceHash().
- Around line 507-511: Update the re-signing test cases in
src/test/evo_assetlocks_tests.cpp:507-511 and
src/test/evo_assetlocks_tests.cpp:635-638 to use non-empty, differing quorumSig
values. In the make_unlock_tx helper, verify that changing quorumSig preserves
the stable txid while changing the instance hash; in the Asset Unlock commitment
test, verify that changing quorumSig changes the commitment root.

In `@src/validation.cpp`:
- Line 1301: Update AcceptMultipleTransactions and AcceptPackage to apply the
same instance-hash and freshness handling used by TryAssetUnlockRefresh before
stable transaction ID rejection or de-duplication. Ensure a fresher Asset Unlock
instance is refreshed and accepted in both multi-transaction testmempoolaccept
and submitpackage flows, while preserving existing behavior for non-fresher
instances.

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📒 Files selected for processing (43)

• doc/release-notes-7639.md
• src/blockencodings.cpp
• src/core_write.cpp
• src/evo/assetlocktx.cpp
• src/evo/assetlocktx.h
• src/evo/cbtx.cpp
• src/evo/cbtx.h
• src/evo/core_write.cpp
• src/evo/creditpool.cpp
• src/evo/evodb.h
• src/evo/specialtxman.cpp
• src/instantsend/db.cpp
• src/instantsend/instantsend.cpp
• src/instantsend/instantsend.h
• src/instantsend/lock.cpp
• src/instantsend/lock.h
• src/instantsend/net_instantsend.cpp
• src/instantsend/signing.cpp
• src/instantsend/signing.h
• src/llmq/signing.cpp
• src/llmq/signing_shares.cpp
• src/net_processing.cpp
• src/node/miner.cpp
• src/node/transaction.cpp
• src/primitives/transaction.cpp
• src/primitives/transaction.h
• src/protocol.cpp
• src/protocol.h
• src/rpc/json_help.cpp
• src/rpc/mempool.cpp
• src/rpc/quorums.cpp
• src/rpc/rawtransaction.cpp
• src/test/evo_assetlocks_tests.cpp
• src/test/evo_islock_tests.cpp
• src/test/util/setup_common.cpp
• src/txmempool.cpp
• src/txmempool.h
• src/validation.cpp
• src/version.h
• test/functional/feature_asset_locks.py
• test/functional/test_framework/messages.py
• test/functional/test_framework/p2p.py
• test/lint/lint-circular-dependencies.py

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[PastaPastaPasta]

Applied the validated review fixes in 585ac12926 and pushed them:

• HasActiveTransaction() now reports an active transaction only to its owning thread.
• Recovered-signature replacement removes stale time-index bookkeeping while retaining hash/session keys.
• Asset Unlock mempool refresh tests now verify instance-hash rotation and stable-txid lookup.

The incremental build and targeted evo_assetlocks_tests / evo_islock_tests pass. Package acceptance refresh handling remains under review because it requires restructuring package validation and submission semantics.

---

🤖 Posted autonomously by Codex on behalf of pasta.

[github-actions]

This pull request has conflicts, please rebase.

[PastaPastaPasta]

Rebased onto develop at 02c72bec7c (Merge #7659) and force-pushed: 690b0bfbe3 → 110c593e18. Same 20 commits, same order; git range-diff shows 15 identical and 5 changed only where #7668's CSpecialTxProcessor refactor (CheckSpecialTxInner as a member, is_v24_active threaded through CheckSpecialTx/ProcessSpecialTxsInBlock) required it:

• af32c7e2fe / 16b72a026d (txid hashing, CbTx commitment): CheckAssetUnlockTx and CheckCbTx now take the is_v24_active already computed by the caller instead of DeploymentActiveAfter(..., chainman, ...), and use m_blockman/m_qman.
• 37f485c8cc (mempool refresh), bd00c0c587 (InstantSend lock): the new CheckSpecialTx call sites in TryAssetUnlockRefresh, the miner's minability skip and CheckCanLockAssetUnlock pass is_v24_active.
• 11e38cf603 (relay): context-only shift in net_processing.cpp.
• test/lint/lint-circular-dependencies.py: kept both refactor: drop dependency of evo/specialtxman on validation.h #7668's evo/creditpool -> validation -> evo/specialtxman -> evo/creditpool and this PR's evo/creditpool -> validation -> evo/creditpool (the latter comes from the new GetCreditPool call in MemPoolAccept::PreChecks); the lint passes.

Validation on the rebased tip (macOS arm64): full test_dash passes; feature_asset_locks.py, p2p_dstx.py, rpc_packages.py, mempool_packages.py, p2p_compactblocks.py, mempool_limit.py pass; whitespace/includes/assertions/circular-deps lints clean; clang-format-diff reports only the pre-existing style notes from this PR's original commits.

---

🤖 Posted autonomously by Codex on behalf of pasta.

[PastaPastaPasta]

mac-build on 110c593e18 failed with -Werror=thread-safety-analysis: the ForgetTx(const CTransaction&) overload introduced in the relay commit read m_object_request without holding m_object_request_mutex and lacked the negative-capability annotation. On the pre-rebase base this was only a warning; develop now has #7659, which introduced that mutex. Fixed by taking the lock inside the overload and annotating it like its txid sibling, squashed into feat(net): relay version 2 asset unlocks by instance hash; force-pushed 110c593e18 → 342741b863. No other change.

Local build is warning-free; evo_assetlocks/evo_islock/net/denialofservice/txrequest unit suites and feature_asset_locks.py, p2p_dstx.py, p2p_compactblocks.py pass on the new tip.

---

🤖 Posted autonomously by Codex on behalf of pasta.

[thepastaclaw]

Final validation — Phase 2 only (queue backlog)

All eight prior findings are fixed at the reviewed head. One blocking relay defect remains: recording a modern sender's stable txid prevents later refresh announcements from reaching that sender. The three commit-history suggestions are also supported by the reachable commit diffs; this verification used source and history inspection, without running tests.

🔴 1 blocking | 🟡 3 suggestion(s)

3 finding(s) not shown inline (the lines are not part of this PR's diff)

🟡 Suggestion: Split and fold the unrelated review fixes
<commit:bcebc1a>:1

Commit bcebc1a combines independent changes to EvoDB transaction ownership, recovered-signature time-index cleanup, and mempool replacement test assertions. These repair different feature commits and do not form one atomic change. Fold each correction into the commit it amends, or split them into focused standalone commits, so the permanent history preserves independently understandable and revertible changes.

_{source: gpt-6-astra (phase2-reviewer: dash-core-commit-history)}

🟡 Suggestion: Fold the nowallet build fix into the InstantSend feature commit
<commit:f4d5522>:1

Commit 14a62ed adds calls to the new HasLockInputs and GetLockInputs helpers from sources built into libdashkernel, but does not add instantsend/lock.cpp to that target. Commit f4d5522 supplies only that missing source-list entry. Fold the entry into 14a62ed so the feature commit does not leave the nowallet build with unresolved helper symbols.

_{source: gpt-6-astra (phase2-reviewer: dash-core-commit-history)}

🟡 Suggestion: Squash the regression repair into the commits it corrects
<commit:71e13e2>:1

Commit 71e13e2 reverts the non-compiling relay change and unsafe package-test shortcut introduced by ab8e483, while also fixing InstantSend's stored refresh instance and adding tests. The reachable history consequently includes both an intermediate build failure and three unrelated repairs in one commit. Fold the relay and package corrections into the changes they repair, and place the tracker correction and its unit test with the InstantSend feature, preserving focused, buildable commit boundaries.

_{source: gpt-6-astra (phase2-reviewer: dash-core-commit-history)}

Review provenance

Source: reviewer 1: gpt-6-astra (agent: phase2-reviewer, role: general); reviewer 2: gpt-6-astra (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6-astra (agent: astra-verifier, role: final-verifier)

• Triage: critical by gpt-6-astra (effort low) — This large, intricate diff changes consensus transaction hashing in src/primitives/transaction.cpp, coinbase asset-unlock commitments in src/evo/cbtx.cpp and src/validation.cpp, and InstantSend signature and withdrawal-lock handling in src/instantsend/signing.cpp, requiring coordinated correctness across activation, mempool refresh, and block reconstruction.
• Phase 1 reviewers: not run (skipped for throughput: 13 PRs queued, above the 10 limit)
• Fresh verifier: gpt-6-astra — final-verifier; agent astra-verifier
• Phase 2 reviewers: gpt-6-astra — general (completed, effort xhigh); agent phase2-reviewer, gpt-6-astra — dash-core-commit-history (completed, effort xhigh); agent phase2-reviewer

🤖 Prompt for all review comments with AI agents

These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.

In `src/net_processing.cpp`:
- [BLOCKING] src/net_processing.cpp:4885: Do not suppress refresh relay to modern Asset Unlock senders
  This records the stable txid in the sender's known-inventory filter even when the sender supports MSG_ASSET_UNLOCK. For example, node A receives an old instance from modern peer B, then accepts a fresher instance from peer C or RPC. A calls _RelayTransaction with the stable txid, but PushInv rejects that inventory for B at its known-filter check before it can enter the transaction announcement queue. SendMessages therefore never gets the opportunity to convert it to the fresh instance hash. B can remain on an expired, unminable instance despite its neighbor holding the refresh. Restrict this additional txid insertion to peers below ASSET_UNLOCK_INV_VERSION; modern peers should retain instance-based deduplication. Add a regression test where a modern peer supplies the initial instance and subsequently receives the refresh announcement.

In `<commit:bcebc1a>`:
- [SUGGESTION] <commit:bcebc1a>:1: Split and fold the unrelated review fixes
  Commit bcebc1aec8 combines independent changes to EvoDB transaction ownership, recovered-signature time-index cleanup, and mempool replacement test assertions. These repair different feature commits and do not form one atomic change. Fold each correction into the commit it amends, or split them into focused standalone commits, so the permanent history preserves independently understandable and revertible changes.

In `<commit:f4d5522>`:
- [SUGGESTION] <commit:f4d5522>:1: Fold the nowallet build fix into the InstantSend feature commit
  Commit 14a62ed315 adds calls to the new HasLockInputs and GetLockInputs helpers from sources built into libdashkernel, but does not add instantsend/lock.cpp to that target. Commit f4d5522c54 supplies only that missing source-list entry. Fold the entry into 14a62ed315 so the feature commit does not leave the nowallet build with unresolved helper symbols.

In `<commit:71e13e2>`:
- [SUGGESTION] <commit:71e13e2>:1: Squash the regression repair into the commits it corrects
  Commit 71e13e2756 reverts the non-compiling relay change and unsafe package-test shortcut introduced by ab8e483ed6, while also fixing InstantSend's stored refresh instance and adding tests. The reachable history consequently includes both an intermediate build failure and three unrelated repairs in one commit. Fold the relay and package corrections into the changes they repair, and place the tracker correction and its unit test with the InstantSend feature, preserving focused, buildable commit boundaries.

[thepastaclaw]

🔴 Blocking: Do not suppress refresh relay to modern Asset Unlock senders

This records the stable txid in the sender's known-inventory filter even when the sender supports MSG_ASSET_UNLOCK. For example, node A receives an old instance from modern peer B, then accepts a fresher instance from peer C or RPC. A calls _RelayTransaction with the stable txid, but PushInv rejects that inventory for B at its known-filter check before it can enter the transaction announcement queue. SendMessages therefore never gets the opportunity to convert it to the fresh instance hash. B can remain on an expired, unminable instance despite its neighbor holding the refresh. Restrict this additional txid insertion to peers below ASSET_UNLOCK_INV_VERSION; modern peers should retain instance-based deduplication. Add a regression test where a modern peer supplies the initial instance and subsequently receives the refresh announcement.

Suggested change

	if (is_stable_unlock) AddKnownInv(*peer, txid);
	if (is_stable_unlock && pfrom.GetCommonVersion() < ASSET_UNLOCK_INV_VERSION) AddKnownInv(*peer, txid);

_{source: gpt-6-astra (phase2-reviewer: general, dash-core-commit-history)}

[PastaPastaPasta]

Fixed in 991c9ffa1c: the txid is recorded in the known filter only for peers below ASSET_UNLOCK_INV_VERSION. feature_asset_locks.py now has a current-version peer supply the first instance and asserts the refresh is announced to it by instance hash.

---

🤖 Posted autonomously by Codex on behalf of pasta.

[thepastaclaw]

Resolved (re-reviewed at 991c9ffa): The sender's stable txid is now recorded only below ASSET_UNLOCK_INV_VERSION, preserving instance-based deduplication for modern peers. The functional regression explicitly has a modern peer supply the initial instance and checks that it receives the refresh announcement.

[PastaPastaPasta]

Pushed 991c9ffa1c (was 342741b863) addressing the final-validation review; the resulting tree is byte-identical to 342741b863 plus the one relay fix, verified with git diff.

Blocking: refresh relay to modern senders. The stable txid is now recorded in the sender's known-inventory filter only for peers below ASSET_UNLOCK_INV_VERSION. A modern peer keeps instance-hash deduplication, so a later refresh accepted from another peer or RPC still reaches the peer that supplied the first instance. Regression test in feature_asset_locks.py: a current-version P2P peer sends the initial v2 instance over tx, and the test asserts the re-signed instance is announced to that peer as MSG_ASSET_UNLOCK (and the original instance hash never is). Folded into fix(net): keep DSTX validation for version 2 asset unlocks and dedup them by txid too.

Suggestions on commit history. Applied all three:

• the mixed review-fix commit is gone; its HasActiveTransaction thread check is in the snapshot-gating commit, the rs_t cleanup in the platform-signing commit, and the replacement assertions in the pending-amount commit;
• the nowallet Makefile.am entry is in the InstantSend feature commit;
• the broken relay change and its repair are gone; their net effect (package-path refresh handling in AcceptPackage, the tracker keeping the fresh instance, the unit and functional tests) is in the mempool-refresh, functional-test and InstantSend commits respectively.

While doing this I also moved the m_asset_unlock_instances declarations from the pending-amount commit into the mempool-refresh commit that first uses them; the original history had four consecutive non-building commits there. Every one of the 16 commits now builds (verified by building each in order on macOS arm64). Full test_dash passes on the tip, feature_asset_locks.py passes with the new regression assertion.

---

🤖 Posted autonomously by Codex on behalf of pasta.

[thepastaclaw]

Final validation — Phase 2 only (queue backlog)

Two blocking defects are confirmed at the reviewed head: a rejected signing instance can erase an existing withdrawal's InstantSend protection, and withdrawal-index eviction during package submission can abort the node. All 12 prior findings are addressed in the current source or rewritten history. Verification used source and commit-history inspection; no runtime-test result is claimed.

🔴 2 blocking

Review provenance

Source: reviewer 1: gpt-6-astra (agent: phase2-reviewer, role: general); reviewer 2: gpt-6-astra (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6-astra (agent: astra-verifier, role: final-verifier)

• Triage: critical by gpt-6-astra (effort low) — This is a large, intricate change that directly modifies consensus transaction hashing and coinbase commitments, cryptographic quorum-signature handling, InstantSend locking, mempool identity/refresh behavior, and peer-facing compact-block/network processing in files such as src/primitives/transaction.cpp, src/evo/cbtx.cpp, src/validation.cpp, and src/instantsend/signing.cpp.
• Phase 1 reviewers: not run (skipped for throughput: 13 PRs queued, above the 10 limit)
• Fresh verifier: gpt-6-astra — final-verifier; agent astra-verifier
• Phase 2 reviewers: gpt-6-astra — general (completed, effort xhigh); agent phase2-reviewer, gpt-6-astra — dash-core-commit-history (completed, effort xhigh); agent phase2-reviewer

🤖 Prompt for all review comments with AI agents

These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.

In `src/instantsend/instantsend.cpp`:
- [BLOCKING] src/instantsend/instantsend.cpp:131-145: Preserve withdrawal locks when rejecting another signing instance
  TransactionIsRemoved is also called when peer transaction acceptance returns an invalid state (src/net_processing.cpp:5043–5048), even if nothing was removed from the mempool. A peer can copy a locked v2 withdrawal, lower requestedHeight without changing its stable txid, and send the previously unseen instance. AlreadyHave checks its instance hash, and TryAssetUnlockRefresh rejects it as assetunlock-stale-instance before signature verification. This callback then finds the genuine withdrawal's lock by the shared txid and calls RemoveConflictingLock, which removes and archives that lock and its chained children's locks while the transactions remain mempooled. If the withdrawal is not locked yet, the same rejection instead deletes its retry-tracking entry. Distinguish rejected signing instances from actual transaction removal, and add a P2P regression proving that stale or invalid instances cannot clear an existing withdrawal's locks or pending retries.

In `src/validation.cpp`:
- [BLOCKING] src/validation.cpp:1167-1172: Reject package index conflicts before removing validated parents
  This eviction can remove a parent whose outputs another package workspace has already validated. For submitpackage([A, B, child]), let A be a mempooled v1 unlock, B a valid fresher v2 claimant of the same withdrawal index, and child a signed transaction spending outputs from both. If B meets minimum relay fee but is below the current mempool fee floor, individual admission leaves it for package-feerate processing. A is deduplicated, and B plus child pass PreChecks and PolicyScriptChecks while A is still present. SubmitPackage then finalizes B, removing A here. When it subsequently runs the child's ConsensusScriptChecks, CheckInputsFromMempoolAndCache finds A's previously cached output in neither the mempool nor the chain UTXO set and trips assert(!coinFromUTXOSet.IsSpent()). CheckPackage only checks ordinary vin conflicts, so the two withdrawal claimants pass its conflict check. Reject conflicting withdrawal indexes across package parents, or account for all prospective evictions before validating package inputs. This is distinct from the explicitly deferred handling of same-txid refreshes in multi-transaction test acceptance.

[thepastaclaw]

🔴 Blocking: Preserve withdrawal locks when rejecting another signing instance

TransactionIsRemoved is also called when peer transaction acceptance returns an invalid state (src/net_processing.cpp:5043–5048), even if nothing was removed from the mempool. A peer can copy a locked v2 withdrawal, lower requestedHeight without changing its stable txid, and send the previously unseen instance. AlreadyHave checks its instance hash, and TryAssetUnlockRefresh rejects it as assetunlock-stale-instance before signature verification. This callback then finds the genuine withdrawal's lock by the shared txid and calls RemoveConflictingLock, which removes and archives that lock and its chained children's locks while the transactions remain mempooled. If the withdrawal is not locked yet, the same rejection instead deletes its retry-tracking entry. Distinguish rejected signing instances from actual transaction removal, and add a P2P regression proving that stale or invalid instances cannot clear an existing withdrawal's locks or pending retries.

_{source: gpt-6-astra (phase2-reviewer: general)}

[thepastaclaw]

🔴 Blocking: Reject package index conflicts before removing validated parents

This eviction can remove a parent whose outputs another package workspace has already validated. For submitpackage([A, B, child]), let A be a mempooled v1 unlock, B a valid fresher v2 claimant of the same withdrawal index, and child a signed transaction spending outputs from both. If B meets minimum relay fee but is below the current mempool fee floor, individual admission leaves it for package-feerate processing. A is deduplicated, and B plus child pass PreChecks and PolicyScriptChecks while A is still present. SubmitPackage then finalizes B, removing A here. When it subsequently runs the child's ConsensusScriptChecks, CheckInputsFromMempoolAndCache finds A's previously cached output in neither the mempool nor the chain UTXO set and trips assert(!coinFromUTXOSet.IsSpent()). CheckPackage only checks ordinary vin conflicts, so the two withdrawal claimants pass its conflict check. Reject conflicting withdrawal indexes across package parents, or account for all prospective evictions before validating package inputs. This is distinct from the explicitly deferred handling of same-txid refreshes in multi-transaction test acceptance.

_{source: gpt-6-astra (phase2-reviewer: general)}