fix(dash-spv)!: verify MnListDiff against its block's coinbase before applying by ZocoLini · Pull Request #1200 · dashpay/rust-dashcore

ZocoLini · 2026-10-20T13:31:22Z

Closes #1117.

MnListDiffs were applied without checking anything, so a peer could inject quorum keys and get ChainLocks it signed itself accepted. Now the engine applies a diff only after MasternodeListValidator checks that:

the diff's merkle proof proves its coinbase in the stored block header;
the resulting list matches the masternode and quorum merkle roots in the coinbase payload.

Applies to single diffs, every diff of a QRInfo, and the replay of stored diffs. The ChainLock part of the issue was done in #1168.

Breaking: MasternodeList::has_valid_mn_list_root/has_valid_llmq_list_root are replaced by verify_coinbase_roots; SmlError gains two variants.

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Approvals
- dash-spv (dash-spv/src/sml_engine.rs, dash-spv/src/sml_engine/snapshot_codec.rs, dash-spv/src/sync/masternodes/sync_manager.rs and 3 more) — QuantumExplorer or xdustinface
- files with no dedicated owner (dash/src/merkle_tree/block.rs, dash/src/network/message_sml.rs, dash/src/sml/error.rs and 2 more) — QuantumExplorer or xdustinface

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Summary by CodeRabbit

Bug Fixes
- Masternode list updates are now checked against block coinbase proofs and commitments before they are accepted, helping prevent invalid or inconsistent lists from being stored.
- Updates with malformed proofs, mismatched block data, or mismatched masternode or quorum commitments now return errors instead of being applied.
New Features
- Partial Merkle trees can now be created from masternode list diffs.

coderabbitai · 2026-10-20T13:31:42Z

Walkthrough

The PR adds coinbase-proof and coinbase-commitment validation for MnListDiff application. It integrates optional validation into MasternodeListEngine, extends mock header storage with merkle roots, and adds tests for invalid proofs, commitment mismatches, and header-storage failures.

Changes: MnListDiff validation

Layer / File(s)	Summary
Coinbase proof and commitment APIs `dash/src/merkle_tree/block.rs`, `dash/src/network/message_sml.rs`, `dash/src/sml/error.rs`, `dash/src/sml/masternode_list/*`	`MnListDiff` can derive and verify its coinbase merkle root. `MasternodeList` verifies masternode and quorum commitments and returns specific `SmlError` variants.
Validation during diff application `dash-spv/src/validation/*`, `dash-spv/src/sml_engine.rs`	`MasternodeListValidator` checks proofs against stored headers. `MasternodeListEngine` runs proof and commitment checks when validation is enabled.
Engine setup and validation support `dash-spv/src/sml_engine.rs`, `dash-spv/src/sml_engine/snapshot_codec.rs`, `dash-spv/src/sync/masternodes/sync_manager.rs`, `dash-spv/src/test_utils/header_storage.rs`	Engine constructors select whether validation is enabled. Mock headers store merkle roots. Tests cover commitment mismatches and header-storage failures.

Priority: High

Estimated code review effort: 3 (Moderate) | ~30 minutes

Change: Bug fix · Severity of issue fixed: High

Sequence Diagram(s)

sequenceDiagram
  participant SyncManager
  participant MasternodeListEngine
  participant MasternodeListValidator
  participant HeaderStorage
  participant MnListDiff
  SyncManager->>MasternodeListEngine: Apply MnListDiff
  MasternodeListEngine->>MasternodeListValidator: Validate coinbase proof
  MasternodeListValidator->>HeaderStorage: Read block header
  HeaderStorage-->>MasternodeListValidator: Return header merkle root
  MasternodeListValidator->>MnListDiff: Derive coinbase merkle root
  MnListDiff-->>MasternodeListValidator: Return proof result
  MasternodeListEngine->>MasternodeListValidator: Validate coinbase commitments
  MasternodeListValidator-->>MasternodeListEngine: Return validation result

Possibly related PRs

dashpay/rust-dashcore#1211: Changes the feed error path that propagates validation failures from apply_diff.
dashpay/rust-dashcore#1227: Changes snapshot decoding, which initializes the validation-enabled engine in this PR.
dashpay/rust-dashcore#1205: Changes sync handling for refused engine responses, including responses caused by these validation failures.

Merge Risk: Moderate · up to 4d215

Previously stored masternode data can bypass the new validation after upgrade. Invalidate or revalidate old snapshots before merging.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title names the main change: MnListDiff is now verified against its block's coinbase before it is applied. The raw summary confirms this. The validator checks the coinbase merkle proof against the…
Linked Issues check		Issue `#1117` is active and directly linked. `MasternodeListValidator::validate_coinbase_proof` checks the stored header hash and the `MnListDiff` coinbase proof. `validate_coinbase_roots` checks the re…
Out of Scope Changes check		The changes stay within issue `#1117`. The validator, Merkle-proof conversion, root verification, error variants, storage-error propagation, engine wiring, and related tests support validation before di…
Docstring Coverage		Docstring coverage is inconclusive: files from earlier reviews still need to be rechecked within the check's analysis limits. Not blocking.

Full details: Title check

Explanation

The title names the main change: MnListDiff is now verified against its block's coinbase before it is applied. The raw summary confirms this. The validator checks the coinbase merkle proof against the stored header, and verify_coinbase_roots checks masternode and quorum roots against the coinbase payload before apply. The title also flags the breaking API change with '!', which matches the PR objectives. The title is short and specific, and it follows the conventional commit style.

Full details: Linked Issues check

Explanation

Issue #1117 is active and directly linked. MasternodeListValidator::validate_coinbase_proof checks the stored header hash and the MnListDiff coinbase proof. validate_coinbase_roots checks the resulting masternode and quorum roots against the coinbase payload. MasternodeListEngine applies these checks to single diffs, all QRInfo diffs, and stored-diff replay before it applies a list. The ChainLock path uses quorums with Verified status. Related tests cover root mismatches and header-storage failures.

Full details: Out of Scope Changes check

Explanation

The changes stay within issue #1117. The validator, Merkle-proof conversion, root verification, error variants, storage-error propagation, engine wiring, and related tests support validation before diff application. Snapshot and test-helper updates support the new validator construction. The validation bypass is restricted to test and test-utils builds.

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github-actions · 2026-10-20T13:32:07Z

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Inline comments:
Review comments at @dash-spv/src/sml_engine.rs:
- Around line 165-174: Refactor the constructor flow so ungated `new` no longer
calls the test-only `new_without_validation`. Add an ungated private
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📥 Commits

Reviewing files that changed from the base of the PR and between 70a1256 and 178d5f6.

📒 Files selected for processing: 11

dash-spv/src/sml_engine.rs
dash-spv/src/storage/masternode.rs
dash-spv/src/sync/masternodes/sync_manager.rs
dash-spv/src/test_utils/header_storage.rs
dash-spv/src/validation/masternode_list.rs
dash-spv/src/validation/mod.rs
dash/src/merkle_tree/block.rs
dash/src/network/message_sml.rs
dash/src/sml/error.rs
dash/src/sml/masternode_list/from_diff.rs
dash/src/sml/masternode_list/merkle_roots.rs

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github-actions · 2026-10-20T13:39:54Z

Your move: coderabbitai requested changes on this head; dismiss the review or push a fix; coderabbitai left review threads unresolved; resolve them.
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… applying A peer's MnListDiff applied without proving anything, so a malicious peer could inject masternodes and quorums, and with them ChainLocks it signed itself. The engine now applies a diff only once `MasternodeListValidator` checks that its merkle proof proves its coinbase in the stored header, and that the list it builds hashes to the masternode and quorum roots that coinbase commits to. This covers single diffs and every diff of a QRInfo, and the replay of stored diffs. BREAKING CHANGE: `MasternodeList::has_valid_mn_list_root` and `has_valid_llmq_list_root` are replaced by `verify_coinbase_roots`, and `SmlError` gains `InvalidCoinbaseProof` and `CoinbaseCommitmentMismatch`. Closes #1117 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

github-actions · 2026-10-20T13:44:43Z

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codecov · 2026-10-20T13:55:04Z

Codecov Report

❌ Patch coverage is 98.63014% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.04%. Comparing base (fc46449) to head (4d215b4).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
dash/src/sml/masternode_list/merkle_roots.rs	95.12%	2 Missing ⚠️
dash-spv/src/validation/masternode_list.rs	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1200      +/-   ##
==========================================
+ Coverage   78.97%   79.04%   +0.07%     
==========================================
  Files         298      299       +1     
  Lines       79207    79371     +164     
==========================================
+ Hits        62554    62742     +188     
+ Misses      16653    16629      -24

Flag	Coverage Δ
core	`78.09% <97.72%> (+0.17%)`	⬆️
ffi	`50.99% <ø> (+<0.01%)`	⬆️
rpc	`52.05% <ø> (ø)`
spv	`93.73% <99.23%> (+0.02%)`	⬆️
wallet	`82.57% <ø> (ø)`

Files with missing lines	Coverage Δ
dash-spv/src/sml_engine.rs	`97.29% <100.00%> (+0.11%)`	⬆️
dash-spv/src/sml_engine/snapshot_codec.rs	`98.24% <100.00%> (-0.01%)`	⬇️
dash-spv/src/sync/masternodes/sync_manager.rs	`99.27% <100.00%> (+<0.01%)`	⬆️
dash/src/merkle_tree/block.rs	`87.77% <100.00%> (+0.74%)`	⬆️
dash/src/network/message_sml.rs	`90.90% <100.00%> (+10.90%)`	⬆️
dash/src/sml/error.rs	`0.00% <ø> (ø)`
dash/src/sml/masternode_list/from_diff.rs	`93.50% <100.00%> (-0.55%)`	⬇️
dash-spv/src/validation/masternode_list.rs	`96.77% <96.77%> (ø)`
dash/src/sml/masternode_list/merkle_roots.rs	`97.84% <95.12%> (+32.09%)`	⬆️

... and 3 files with indirect coverage changes

github-actions · 2026-10-20T17:29:08Z

Bots are done — your move: post /self-reviewed.
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… masternode list diff (#1204) NOT SECURE, AND TEMPORARY. MasternodeListEngine keeps the coinbase payload of the highest block an applied masternode list diff carried one for, and exposes it as MasternodeListEngine::latest_coinbase() and DashSpvClient::latest_coinbase(). Nothing authenticates it: neither the diff's merkle proof of the coinbase nor the payload's merkle roots are checked, and quorum verification does not gate it, so one peer can serve a payload of its choosing. On dev, #1202 (on top of #1200) replaces it with a version that keeps only verified coinbases, under the same names and return types. Platform v5.0's wallet reads the payload version to tell whether Dash Core's V24 deployment is active (version 4 from V24), so it builds the ProUpServTx version Core accepts for an evonode. The payload is kept in memory only: serde skips it and the engine's bincode Encode/Decode are hand-written with the derived layout minus the field, so persisted engines decode unchanged. Breaking: the field is pub, so struct literals and patterns listing every field must add it. When this branch is reconciled with dev, drop this change rather than port it; see the PR description for the conflict resolutions. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

github-actions · 2026-10-23T15:13:47Z

This PR has merge conflicts with the base branch. Please rebase or merge the base branch into your branch to resolve them.

…roots

github-actions · 2026-10-26T20:19:03Z

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Review comments at @dash-spv/src/sml_engine.rs:
- Line 100: Update the MasternodeListEngine struct literal in snapshot
restoration to initialize validator from the restored headers and include it in
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dash-spv/src/sml_engine.rs
dash-spv/src/sync/masternodes/sync_manager.rs
dash-spv/src/validation/masternode_list.rs
dash/src/sml/masternode_list/from_diff.rs

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xdustinface · 2026-10-29T00:47:08Z

Tests are failing here, probably only coderabbits complaint.

…roots

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ZocoLini · 2026-10-29T08:16:24Z

@xdustinface fixed

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feat(dash-spv): expose the coinbase payload of the newest validated diff #1202

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feat(dash)!: temporarily expose the unverified coinbase of the newest masternode list diff #1204

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fix(platform-wallet): detect Core V24 from the SPV coinbase on v5.1 when building an evonode ProUpServTx dashpay/platform#5568

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feat: validate masternode list merkle root #799

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feat(dash-spv)!: check masternode list diffs against the block coinbase #1206

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chore(platform)!: update rust-dashcore to dev 7329126e dashpay/platform#5726

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fix(dash-spv)!: refuse QRInfo active-set entries that are not in the coinbase-verified tip list #1324

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