[huangji6693-max]

Summary

Implements client-side Simplified Payment Verification (SPV) header chain validation and a zero-allocation Cuckoo Filter WASM pre-filter for the browser local indexer (#301).

Closes #301
/claim #301

Architecture & Key Changes

1. Zero-Allocation Cuckoo Filter & Merkle Branch Verifier in Rust (contracts/validation/src/cuckoo.rs & contracts/validation/src/lib.rs):

   • Implemented ZeroAllocCuckooFilter using a fixed [[u16; 4]; 1024] 4-way associative bucket table (~8 KiB) with FNV-1a 64-bit primary bucket indexing, non-zero 16-bit fingerprints ([1, 65535]), XOR alternate bucket involution (i2 = (i1 ^ (hash(fp) & 0x3FF)) & 0x3FF), and bounded deterministic Cuckoo eviction kicks (MAX_CUCKOO_KICKS = 64).
   • Implemented verify_sha256_merkle_branch for deterministic SHA-256 Merkle inclusion branch verification without heap allocations.

2. WASM Bridge (frontend/src/wasm/pactum-validation/pactum_validation.js & pactum_validation.d.ts):

   • Exported zero-allocation Uint16Array Cuckoo filter primitives (cuckoo_filter_reset, cuckoo_filter_len, cuckoo_filter_contains, cuckoo_filter_insert, cuckoo_filter_delete) matching the Rust ZeroAllocCuckooFilter semantics.

3. WebWorker SPV Header Chain & BucketList Inclusion Verifier (frontend/src/workers/validation.worker.ts):

   • Added verifySpvHeaderChain validating strictly sequential Stellar ledger headers, previous-header hash links, canonical header SHA-256 hashes, and 4-level Stellar BucketList SHA-256 Merkle roots (curr_0..3 / snap_0..3).
   • Added evaluateCuckooInclusionProof combining O(1) Cuckoo Filter pre-checks with full SHA-256 Merkle inclusion branch verification against the verified BucketList root.
   • Added worker message handlers VERIFY_SPV_HEADER_CHAIN and VERIFY_CUCKOO_INCLUSION.

4. Local Indexer RPC Guard (frontend/src/lib/localIndexer/rpcClient.ts):

   • Added SpvStateManager to verify incoming RPC ledger states and commitments before rendering balances or commitments in the UI.
   • Detects and blocks spoofed balances, tampered commitment amounts/statuses, and phantom RPC entries that fail Cuckoo filter or Merkle inclusion verification, surfacing explicit WARNING: ... security alerts.

Verification

• Rust Unit Tests (contracts/validation): cargo test -p pactum-validation — 13 / 13 passed
• Rust Clippy: cargo clippy -p pactum-validation --lib -- -D warnings — 0 warnings
• Frontend Vitest Suite (spvVerification.test.ts + localIndexer): npx vitest run src/lib/localIndexer/spvVerification.test.ts src/lib/localIndexer/poller.test.ts src/lib/localIndexer/events.test.ts src/lib/localIndexer/db.test.ts — 29 / 29 passed
• Frontend Linter & Typecheck: npm run lint (oxlint) & npx tsc -b --noEmit — 0 warnings, 0 errors
• Numeric ID Policy Check: node scripts/ci/check-numeric-ids.mjs — PASSED

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