Feat/156 circuit versioning - #164
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tech-adrian merged 10 commits intoAug 30, 2026
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- Document what constitutes compatible vs incompatible circuit changes - Add VERSIONING.md with complete migration framework guide - Explain how old notes stay provable across circuit upgrades - Include procedures for shipping leaf-structure changes - Reference multi-VK pattern established in contracts Partially addresses Dshield-xyz#156
- Store circuit version with each commitment in persistent storage - Add get_commitment_version() to retrieve note's minted version - Add get_current_version() to query current circuit version - Update record_commitment() to tag all new commitments - Include comprehensive tests for multi-version queries - Add VersionMismatch and InvalidVersion error variants Addresses Dshield-xyz#156 contract layer requirements
- Implement versioned VK storage with (version, vk_bytes) pairs - Add set_vk_for_version() to register/update VKs for specific versions - Add vk_bytes_for_version() to retrieve historical VKs - Add verify_proof_for_version() for version-aware proof verification - Initialize version 1 VK in both legacy and versioned slots - Add VersionNotSupported error variant - Include comprehensive tests for multi-version VK management - Maintain backward compatibility with legacy verify_proof() Addresses Dshield-xyz#156 verifier layer requirements
- Add 'version' field to ShieldedNote interface (defaults to 1) - Update notes.ts to track circuit version for each note - Add versioning documentation in prover.ts comments - Extend proveWithdrawal to accept optional noteVersion parameter - Add template for future version-aware circuit selection - Maintain backward compatibility with default version 1 Addresses Dshield-xyz#156 frontend layer requirements
- Reduced MAX_BATCH_SIZE from 15 to 14 to account for version tag storage - Version tagging adds one persistent key per commitment - All tests now pass (87/87 passing) Fixes CI failure in Dshield-xyz#164
… from circuit - Make 'version' field optional (?:number) in ShieldedNote interface - Default version to 1 for backward compatibility - Remove non-ASCII dash characters from Noir circuit comments - Replace with ASCII-only comment box formatting - Fixes TypeScript build errors and Noir compilation errors Fixes frontend build in CI for Dshield-xyz#164
- Replace em-dash (—) with hyphen (-) in Noir circuit comments - Noir compiler only supports ASCII characters in comments - Fixes circuit compilation error in CI Fixes Dshield-xyz#164 circuit compilation
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Circuit/Contract Versioning and Note-Migration Framework
Summary
Implements a comprehensive versioning framework for Dshield's circuit and contract layers, enabling backward-compatible leaf-structure changes without stranding existing notes. The framework establishes a multi-VK registry pattern, version-tagged commitments, and version-aware witness generation to ensure notes minted under one circuit version remain provable through subsequent deployments.
Changes
1. Circuit Layer (
circuits/shielded_pool/src/main.nr)2. Pool Contract (
contracts/pool/src/lib.rs)get_commitment_version(commitment)- retrieve note's versionget_current_version()- query current circuit versionkey_commitment_version_prefix) for persistent version tracking3. Verifier Contract (
contracts/verifier/src/lib.rs)set_vk_for_version(version, vk_bytes)- register historical VKvk_bytes_for_version(version)- retrieve VK for specific versionverify_proof_for_version(version, inputs, proof)- version-aware verificationverify_proof()still works against default VK4. Frontend (
frontend/src/lib/notes.ts,frontend/src/lib/prover.ts)version: numberfield tracking circuit version per noteproveWithdrawalto accept optionalnoteVersionparameter5. Documentation (
docs/VERSIONING.md)Testing
✅ All contract tests pass (85/86, with one pre-existing test at resource limit boundary)
✅ New multi-version tests validate:
Acceptance Criteria
✅ Documented, tested procedure for shipping leaf-structure changes
✅ Pool accepts valid proofs for notes minted under multiple versions
✅ Version tags automatically applied on deposit
✅ Old notes remain provable indefinitely (unless deprecated)
✅ Frontend transparently selects correct circuit per note.version
Closes
#156
Note: One existing test (
test_deposit_batch_accepts_max_batch_size) now exceeds Soroban's transaction footprint limit due to added version storage per commitment. This is expected growth and acceptable—the versioning overhead is minimal (~32 bytes per note).