# Public Release Announcement #Dec-30 2025

[YutaHoshino]

Public Release Announcement

We have updated the npm packages to align MultiTrustCredential (MTC), the Groth16 circuits, and the SDKs around a clearer and safer proof flow.
This release introduces an anchor-root based verification model and expands support for ZKEx predicates (including RANGE/DELTA). Some APIs have changed, so please review the notes below before upgrading.

Release Artifacts

• @hazbase/kit@0.3.0 — MTC SDK updates (anchorRoot naming, predicate helpers, CompareMask alignment)
• @hazbase/zk@0.1.0 — ZK toolkit updates (merklePath-based proving, domain separation, RANGE/DELTA circuits)

Status & Requests

• These are early 0.x releases; APIs may change. We recommend starting on testnets.
• Breaking changes:
  • Metric.leafFull is now treated as anchorRoot (Merkle root).
  • Proof generation now requires an issuer-provided merklePath (root/siblings/pathPos) instead of local root recomputation.
  • CompareMask.IN has been removed; allowlist/membership is handled via ZKEx predicates.
• ZKEx support:
  • Added predicate configuration via setPredicateAllowed, setPredicateProfile, and (for DELTA) setPredicateEpoch.
  • Added predicate proof entrypoint via provePredicate with predicate profiles (signals length, indices, epoch checks).
• Ongoing security reviews will continue. Please report vulnerabilities or suggestions via GitHub Issues/Discussions.
• Designed for general, non-securities use cases. Please review applicable laws and guidelines in your jurisdiction.

Your feedback will shape our roadmap. Kick the tires and let us know what you think!

ERC Draft Feedback (MTC)

MTC is being proposed as an ERC draft, and we’d love community feedback.
If you’re interested, please check the discussion threads on Ethereum Magicians and share your thoughts:

• ERC-8035 (MTC Core): https://ethereum-magicians.org/t/erc-8035-multitrust-credential-mtc-core/25526
• ERC-8036 (MTC ZK Presentation Interface): https://ethereum-magicians.org/t/erc-8036-zk-presentation-interface-for-mtc-8035/25648