[PastaPastaPasta]

Issue being fixed or feature implemented

When a node stops in the middle of a coins-database flush (crash, power loss, OOM kill), the next start rolls the unflushed blocks forward in ReplayBlocks(). That runs inside LoadChainstate() before LoadChainTip(), so the chain is still empty while RollforwardBlock() re-processes each block's special transactions and quorum commitments. Several of those checks read the chain, and two things go wrong on a chain with quorums:

• A block containing a mined quorum commitment aborts the node: IsMiningPhase() asserts nHeight <= active_chain.Height() + 1, and the chain height is -1. The existing "skip when replaying" branches in CQuorumBlockProcessor do not cover that assertion, so the node crashes again on every start until -reindex-chainstate.
• Asset-unlock and MNHF-signal transactions resolve their quorum against the chain, and with an empty chain they find none. Replay rejects the block (bad-assetunlock-too-old-quorum) and startup fails with "Unable to replay blocks. You will need to rebuild the database using -reindex-chainstate."

Separately, RollforwardBlock() processes blocks under whatever BLS scheme the process-wide flag holds. At that point in startup it holds the legacy default, because VerifyLoadedChainstate() only sets it later. So the first replayed post-V19 block runs under the legacy scheme, and an asset unlock in that block fails signature verification (bad-assetunlock-not-verified) even with a chain in place. ConnectBlock() already sets the scheme for each block with ScopedBLSLegacyScheme. The replay path never got that guard.

The replay range covers every block since the previous coins flush, often hours of blocks. Mainnet mines a non-null quorum commitment roughly every half hour, so in practice this recovery always fails on mainnet and needs a full -reindex-chainstate. That costs masternodes hours offline.

What was done?

• ReplayBlocks() sets the chain tip to the parent of each block before rolling it forward. Each replayed block then sees the same chain view ConnectBlock() saw when the block was first connected. The tip is moved to the parent before each block, not to the block after it, so the chain ends one block short of the new coins tip. LoadChainTip() then still runs its full path: it sets the tip and prunes the block-index candidates that LoadBlockIndex() added while the chain was empty.
• RollforwardBlock() establishes the block's BLS scheme the same way ConnectBlock() does. The guard is not committed: every replayed block sets its own scheme on entry, and VerifyLoadedChainstate() sets the scheme for the loaded tip afterwards.

Both changes only affect local crash recovery of blocks this node already fully validated. Block validation rules, serialization and the P2P protocol are unchanged.

The CbTx best-ChainLock check is not involved: replay passes fCheckCbTxMerkleRoots=false, so the coinbase payload checks are skipped there.

The chainstate.m_chain.Tip() == nullptr "skip when replaying" branches in CQuorumBlockProcessor are no longer reached during replay, because replay now runs with the same chain view as ConnectBlock(). They are left in place to keep this change small and can be removed in a follow-up.

How Has This Been Tested?

New step test_replay_after_crash at the end of feature_asset_locks.py, which already has the platform quorum, evo masternodes and asset unlock helpers. It crashes the regular node mid-flush twice and checks the replay each time. Each cycle restarts the node with -dbcrashratio=1 -dbbatchsize=1, mines without flushing, and forces a flush (gettxoutsetinfo) that crashes the node after its first partial batch. The node is then restarted without peers and must log Rolling forward for every expected block, come back at the same tip, and have the same UTXO set hash as the other node.

• Cycle 1 mines a new platform quorum commitment and then an asset unlock (index 900) signed by a platform quorum. It also checks the new quorum is listed after the restart. The commitment block is replayed before the unlock.
• Cycle 2 starts from a clean flush with the quorum already mature and mines only an asset unlock (index 901), so the unlock is the first and only block rolled forward. No earlier replayed block resets the BLS scheme, so this cycle is what independently covers the RollforwardBlock() scheme guard.

After the second cycle the node is restarted normally and reconnected, so the step leaves the file as it found it.

Results (macOS arm64, --enable-debug, full feature_asset_locks.py run, about 3 minutes):

• With this PR: passes, with and without --usecli.
• With the two src/validation.cpp fixes reverted (the PR base): cycle 1 fails at the restart, with the node aborting during startup on the IsMiningPhase() assertion (Assertion failed: (nHeight <= active_chain.Height() + 1), function IsMiningPhase, file blockprocessor.cpp). The commitment block is replayed before the asset unlock block, so the test reaches that crash first.
• With only the chain-tip change reverted (BLS guard kept): cycle 1 fails with the same IsMiningPhase() assertion.
• With only the BLS scheme guard removed (chain-tip change kept): cycle 1 still passes, because the post-V19 blocks replayed before the unlock reset the global scheme as a side effect. Cycle 2 fails: startup aborts with "Unable to replay blocks" and the log shows RollforwardBlock(DASH): ProcessSpecialTxsInBlock for block ... failed with bad-assetunlock-not-verified.

Also ran feature_dbcrash.py and the unit suites validation_chainstatemanager_tests, validation_chainstate_tests, validation_flush_tests, evo_cbtx_tests, evo_snapshot_tests, plus test/lint/lint-whitespace.py.

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-15T05:00:15.849317Z	74dc3e5	New commits

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ℹ️ Recent review info

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• test/functional/feature_asset_locks.py

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Walkthrough

Block replay now sets the chain tip to each block’s parent before processing it. It selects the BLS scheme based on V19 activation at that block. A functional test triggers database crashes during flushes and checks replay of quorum commitment and asset-unlock blocks. It verifies the recovered tip and the serialized UTXO-set hash.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 74dc3

Crash recovery has no established implementation defect, but the test does not confirm commitment-before-unlock replay order. This is a bounded test-coverage gap rather than a merge blocker.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 7.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly summarizes the main change: startup block replay now handles quorum commitments and asset unlocks.
Description check		The description is directly related to the changeset. It explains the replay failures, the two fixes, the crash-recovery test, and the reported test results.

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[thepastaclaw]

✅ Final review complete — no blockers (commit 74dc3e5) · triage: normal

[thepastaclaw]

Final validation — Phase 1 + Phase 2

Static verification at head 87e9eee confirms the supplied reviewers' conclusions: the parent-tip replay view matches ConnectBlock's context, preserves LoadChainTip candidate pruning, and the scoped BLS guard establishes the correct scheme for each replayed block. The new functional test checks offline recovery to the expected tip, quorum availability, and matching UTXO state; no actionable in-scope findings were identified. No builds or tests were run locally; the supplied CI snapshot shows successful builds, lint, and standard, SQLite, and no-wallet test jobs, with multiprocess, TSan, and ASan tests still pending.

Review provenance

Source: reviewer 1: muse-spark-1.3-contributor (agent: phase1-reviewer, role: general); reviewer 2: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 3: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6.1-sol (agent: sol-verifier, role: final-verifier)

• Triage: normal by gpt-6.1-sol (effort low) — The small changes to ReplayBlocks() and RollforwardBlock() require reasoning about startup chain state, per-block BLS scheme selection and crash recovery, but do not meet the large-or-intricate threshold for critical.
• Phase 1 reviewers: muse-spark-1.3-contributor — general (completed, effort xhigh); agent phase1-reviewer
• Phase 1 model: muse-spark-1.3-contributor — not quota-gated; passed over gemini-3.8-flash-high (antigravity below 15% reserve: weekly 14% left, 5h 100% left), glm-5.3-flash (not used above high effort; tier asks max)
• Fresh verifier: gpt-6.1-sol — final-verifier; agent sol-verifier
• Phase 2 reviewers: gpt-6.1-sol — general (completed, effort high); agent phase2-reviewer, gpt-6.1-sol — dash-core-commit-history (completed, effort high); agent phase2-reviewer

[coderabbitai]

🧹 Nitpick comments: 1

test/functional/feature_asset_locks.py: 1

1464-1464: 🎯 Functional Correctness | 🔵 Trivial | ⚡ Quick win

Assert replay order explicitly.

assert_debug_log checks that each message appears, but it does not compare their positions. The later tip, quorum, and UTXO-hash assertions do not check replay order. Add an assertion that the commitment message occurs before the unlock message.

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Review comment at @test/functional/feature_asset_locks.py at line 1464:
Update the replay-log check in the test to assert that the “Rolling forward”
commitment message appears before the unlock message; do not rely on
`assert_debug_log` alone, since it only checks that both messages occur.

---

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Nitpick comments:
Review comments at @test/functional/feature_asset_locks.py:
- Line 1464: Update the replay-log check in the test to assert that the “Rolling
forward” commitment message appears before the unlock message; do not rely on
`assert_debug_log` alone, since it only checks that both messages occur.

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[thepastaclaw]

Re-review — Final validation — Phase 1 + Phase 2

At head f1e52a8, the replay changes match ConnectBlock's chain-view and BLS-scheme handling while preserving LoadChainTip's candidate pruning; static review identified no production-code defect. The regression scenario covers commitment-and-unlock recovery but does not independently protect the BLS fix. No builds or tests were run in this static lane; the supplied CI snapshot shows lint and formatting passing, with source builds still queued.

🟡 1 suggestion(s)

Review provenance

Source: reviewer 1: muse-spark-1.3-contributor (agent: phase1-reviewer, role: general); reviewer 2: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 3: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); reviewer 4: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 5: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6.1-sol (agent: sol-verifier, role: final-verifier)

• Triage: normal by gpt-6.1-sol (effort low) — The small diff changes startup replay chain context and BLS scheme selection in src/validation.cpp, requiring reasoning about recovery invariants but not meeting the large-or-intricate threshold for critical.
• Phase 1 reviewers: muse-spark-1.3-contributor — general (completed, effort xhigh); agent phase1-reviewer
• Phase 1 model: muse-spark-1.3-contributor — not quota-gated; passed over gemini-3.8-flash-high (antigravity below 15% reserve: weekly 14% left, 5h 100% left), glm-5.3-flash (not used above high effort; tier asks max)
• Fresh final gate: an independent Phase-2 review ran after iterative findings were reconciled
• Fresh verifier: gpt-6.1-sol — final-verifier; agent sol-verifier
• Phase 2 reviewers: gpt-6.1-sol — general (completed, effort high); agent phase2-reviewer, gpt-6.1-sol — dash-core-commit-history (completed, effort high); agent phase2-reviewer, gpt-6.1-sol — general (completed, effort high); agent phase2-reviewer, gpt-6.1-sol — dash-core-commit-history (completed, effort high); agent phase2-reviewer

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

In `test/functional/feature_asset_locks.py`:
- [SUGGESTION] test/functional/feature_asset_locks.py:1452-1456: Exercise an asset unlock in the first replayed block
  Mining and maturing the quorum after the clean restart puts multiple post-V19 blocks ahead of the unlock in the replay range. If the new RollforwardBlock() BLS guard is removed while the chain-tip fix remains, ProcessSpecialTxsInBlock() switches the global flag to basic at the end of an earlier successfully replayed block, so the unlock is still checked under the correct scheme. This scenario therefore does not independently protect the BLS fix. Retain the commitment-replay scenario and add a second crash cycle with an already mature quorum and a clean flush immediately before the unlock block, making the unlock the first block rolled forward. Removing only the BLS guard is the targeted mutation check for that additional scenario.

[thepastaclaw]

Re-review — Final validation — Phase 1 + Phase 2

Independently reviewed the complete diff at 74dc3e5 and verified the supplied reviewer conclusions against the replay, startup, quorum-processing, BLS, and functional-test paths; no actionable in-scope defects were found. The second crash cycle addresses the prior coverage finding by cleanly flushing the mature quorum before mining the sole asset-unlock block. Validation was static only: no builds or tests were run, and the supplied CI snapshot still showed build checks queued and lint in progress.

🔴 0 blocking | 🟡 0 suggestion(s) | 💬 0 nitpick(s)

Review provenance

Source: reviewer 1: muse-spark-1.3-contributor (agent: phase1-reviewer, role: general); reviewer 2: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 3: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); reviewer 4: gpt-6.1-sol (agent: phase2-reviewer, role: general); reviewer 5: gpt-6.1-sol (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6.1-sol (agent: sol-verifier, role: final-verifier)

• Triage: normal by gpt-6.1-sol (effort low) — The small replay-path changes require reasoning about chain-tip initialization and per-block BLS scheme lifetime, but are not large or intricate enough to meet the critical tier.
• Phase 1 reviewers: muse-spark-1.3-contributor — general (completed, effort xhigh); agent phase1-reviewer
• Phase 1 model: muse-spark-1.3-contributor — not quota-gated; passed over gemini-3.8-flash-high (antigravity below 15% reserve: weekly 14% left, 5h 100% left), glm-5.3-flash (not used above high effort; tier asks max)
• Fresh final gate: an independent Phase-2 review ran after iterative findings were reconciled
• Fresh verifier: gpt-6.1-sol — final-verifier; agent sol-verifier
• Phase 2 reviewers: gpt-6.1-sol — general (completed, effort high); agent phase2-reviewer, gpt-6.1-sol — dash-core-commit-history (completed, effort high); agent phase2-reviewer, gpt-6.1-sol — general (completed, effort high); agent phase2-reviewer, gpt-6.1-sol — dash-core-commit-history (completed, effort high); agent phase2-reviewer

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These findings are from an automated code review. Verify the current code and confirm that no unresolved issues remain.

No unresolved findings remain from the prior review on this head.

[PastaPastaPasta]

approved