feat: implement Soroban MMR accumulator & Merkle proof verification engine - #1004
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Mosas2000 merged 1 commit intoJul 30, 2026
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…tellaBridge#1002) Adds a full Merkle Mountain Range (MMR) accumulator system spanning the Soroban contract, backend service, API routes, and test suites. Soroban contract (contracts/soroban/src/mmr_accumulator.rs): - MmrAccumulatorContract with initialize, append, get_root, get_leaf_count, get_peaks, verify_mmr_proof, verify_against_current methods - Domain-separated hashing: leaf = SHA-256(0x00 || data), node = SHA-256(0x01 || L || R) - Append algorithm: merges leaf upward through peaks until a vacant height slot is found; O(log N) work per insertion - bag_peaks(): sequential right-to-left merge of active peaks → single root - verify_mmr_proof(): re-derives local subtree root from leaf + siblings, substitutes into peaks snapshot, bags, and compares against expected_root - O(log N) space: only peaks (at most ⌊log₂ N⌋ + 1) are stored persistently - 90-day TTL extension on every state write Backend service (backend/src/services/mmrAccumulator.service.ts): - MmrAccumulatorService class mirroring contract algorithm in TypeScript - append(rawCommitment), appendBatch, generateProof(leafIndex) - verifyProof(proof, expectedRoot), verifyProofAgainstCurrent(proof) - serialize() / fromSerialized() for persistence integration - hashLeaf / hashNode match Soroban domain separators exactly API routes (backend/src/api/routes/mmrVerification.routes.ts): - POST /api/v1/reconciliation/verify-mmr-proof — stateless proof verification - POST /api/v1/reconciliation/mmr/append — simulation append - POST /api/v1/reconciliation/mmr/append-batch — batch simulation - POST /api/v1/reconciliation/mmr/generate-proof — proof generation - GET /api/v1/reconciliation/mmr/state — current root + leaf count + peaks - Zod validation on all inputs; registered in reconciliation route group Tests: - contracts/soroban/tests/mmr_accumulator.test.rs (13 Soroban unit tests): init, double-init guard, append single/multiple, root changes, determinism, empty-root error, single-leaf proof, wrong-root failure, tampered leaf, two-leaf peak count, 1001-leaf determinism, verify_against_current - backend/tests/unit/mmrAccumulator.test.ts (28 TypeScript tests): append semantics, invalid size rejection, root determinism, batch append, proof round-trips for 1/2/4/7-leaf trees, tampered leaf/sibling/root detection, out-of-range index error, historical proof against captured root, 10 000-leaf root stability, 5 000-leaf spot verification, serialization Closes StellaBridge#1002
Contributor
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The implementation of the Soroban MMR accumulator and its accompanying proof verification engine is exceptionally well-architected, providing a highly efficient, log-space solution for historical reserve commitments. |
Contributor
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The seamless synchronization between the smart contract, backend services, and comprehensive test suites makes this a robust feature that is fully ready to be approved and merged. |
Contributor
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Thank you for the good job. |
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Closes #1002
Summary
contracts/soroban/src/mmr_accumulator.rs):MmrAccumulatorContract— append-only leaf insertion, peak aggregation, bagged-root derivation, and O(log N)verify_mmr_proof+verify_against_current; domain-separated hashing (0x00 prefix for leaves, 0x01 for inner nodes); persistent storage with 90-day TTL extensionbackend/src/services/mmrAccumulator.service.ts):MmrAccumulatorServicein TypeScript mirroring the contract algorithm exactly —append,appendBatch,generateProof,verifyProof,verifyProofAgainstCurrent,serialize/fromSerializedbackend/src/api/routes/mmrVerification.routes.ts, registered under/api/v1/reconciliation):POST /verify-mmr-proof— stateless proof verification (all material in request body)POST /mmr/append— simulation appendPOST /mmr/append-batch— batch simulation (up to 1 000 leaves)POST /mmr/generate-proof— proof generation for a given leaf indexGET /mmr/state— live root, leaf count, active peaksComplexity
Every proof path length ≤ ⌊log₂ N⌋ + peaks_count ≤ 2 log₂ N, giving O(log N) space and verification time as required.