Core identity contract implementing ERC-734 and ERC-735. Manages keys with purposes (MANAGEMENT, ACTION, CLAIM, ENCRYPTION), handles claim lifecycle (add, remove, get), supports execution of actions with approval workflow, and includes signature recovery with EIP-2 malleability checks. Designed for use as a proxy implementation with a delegatedOnly modifier and an initialize function. Demonstrates clean separation of storage and logic, and robust permission handling.

Extends Identity to act as a claim issuer. Adds claim revocation by signature (preferred) or by claim ID (deprecated). Implements isClaimValid to verify claims using ECDSA recovery and key purpose checks. Prevents revocation of already revoked claims. Demonstrates a secure revocation pattern and integration with identity contracts.

Factory contract for deploying identity proxies using CREATE2. Supports creating identities for wallets (with optional multiple management keys) and tokens. Manages wallet-to-identity linking, token factory registration, and salt uniqueness. Uses an immutable ImplementationAuthority reference for upgradeability. Demonstrates deterministic deployment and complex state management across multiple mappings.

Gateway contract that authorizes identity deployment via off-chain signatures from approved signers. Supports custom salt, management keys, signature expiry, and signature revocation. Uses ECDSA recovery and custom errors for clear failure modes. Demonstrates a secure pattern for delegating deployment authority while maintaining control through signer management.

Verifier contract that checks if an identity holds valid claims from trusted issuers for required topics. Manages trusted issuers and their claim topics, supports adding/removing issuers and topics, and provides a verify function that iterates over required topics and validates claims. Uses try/catch for robust external calls. Demonstrates a flexible on-chain verification pattern for identity compliance.