Identity Factory

The Identity Factory is a specialized contract deployment system for creating ERC-734/ERC-735 compliant identity contracts. It provides standardized deployment of identity contracts with key management and claim verification capabilities.

Overview

The Identity Factory provides:

  • Identity Deployment: Deploy ERC-734/ERC-735 identity contracts
  • Key Management Setup: Initialize identity contracts with management keys
  • Claim Integration: Setup trusted issuer relationships
  • Registry Integration: Automatic registration with identity registries
  • Template Management: Manage different identity contract templates

Key Features

Identity Contract Deployment

  • ERC-734 Compliance: Deploy key manager compliant contracts
  • ERC-735 Compliance: Deploy claim holder compliant contracts
  • Combined Implementation: Deploy contracts supporting both standards
  • Custom Configuration: Support custom identity configurations

Key Management Integration

  • Management Keys: Setup initial management keys
  • Action Keys: Configure action-specific keys
  • Claim Keys: Setup claim signing keys
  • Encryption Keys: Configure encryption capabilities

Registry Integration

  • Automatic Registration: Register identities with central registry
  • Trusted Issuer Setup: Configure trusted issuer relationships
  • Claim Verification: Setup claim verification mechanisms
  • Identity Linking: Link identities to external systems

Core Interface

interface IIdentityFactory {
    struct IdentityConfig {
        address owner;
        bytes32[] managementKeys;
        bytes32[] actionKeys;
        bytes32[] claimKeys;
        address[] trustedIssuers;
        bool registerWithRegistry;
    }

    struct IdentityTemplate {
        string name;
        string version;
        address implementation;
        bytes initCode;
        bool active;
    }

    event IdentityDeployed(
        address indexed identity,
        address indexed owner,
        string templateName
    );

    event TemplateRegistered(
        string indexed name,
        string version,
        address indexed creator
    );

    function deployIdentity(
        string calldata templateName,
        IdentityConfig calldata config
    ) external returns (address identity);

    function registerTemplate(IdentityTemplate calldata template) external;
    function getTemplate(string calldata name) external view returns (IdentityTemplate memory);
    function predictIdentityAddress(
        string calldata templateName,
        IdentityConfig calldata config
    ) external view returns (address);
}

Core Functions

deployIdentity()

Deploys a new identity contract using a registered template.

Parameters: - templateName: Name of the template to use - config: Identity configuration including keys and settings

Returns: - address: Address of the deployed identity contract

Usage:

IIdentityFactory.IdentityConfig memory config = IIdentityFactory.IdentityConfig({
    owner: msg.sender,
    managementKeys: [keccak256(abi.encodePacked(msg.sender))],
    actionKeys: [keccak256(abi.encodePacked(actionKey))],
    claimKeys: [keccak256(abi.encodePacked(claimKey))],
    trustedIssuers: [trustedIssuerAddress],
    registerWithRegistry: true
});

address identity = IIdentityFactory(factory).deployIdentity("StandardIdentity", config);

registerTemplate()

Registers a new identity template for deployment.

Parameters: - template: Template configuration including implementation and initialization

Access Control: - Restricted to authorized template creators

predictIdentityAddress()

Predicts the address of an identity contract before deployment.

Parameters: - templateName: Name of the template - config: Identity configuration

Returns: - address: Predicted identity address

Implementation Example

Basic Identity Factory

contract IdentityFactory is IIdentityFactory {
    using Clones for address;

    mapping(string => IdentityTemplate) private templates;
    mapping(address => bool) public templateCreators;
    address public identityRegistry;

    modifier onlyTemplateCreator() {
        require(templateCreators[msg.sender] || msg.sender == owner(), "Not authorized");
        _;
    }

    function deployIdentity(
        string calldata templateName,
        IdentityConfig calldata config
    ) external override returns (address identity) {
        IdentityTemplate memory template = templates[templateName];
        require(template.active, "Template not active");
        require(config.owner != address(0), "Invalid owner");

        // Deploy identity using minimal proxy pattern
        bytes32 salt = keccak256(abi.encodePacked(config.owner, block.timestamp));
        identity = template.implementation.cloneDeterministic(salt);

        // Initialize identity with configuration
        _initializeIdentity(identity, config, template);

        // Register with identity registry if requested
        if (config.registerWithRegistry && identityRegistry != address(0)) {
            IIdentityRegistry(identityRegistry).registerIdentity(identity, config.owner);
        }

        emit IdentityDeployed(identity, config.owner, templateName);
    }

    function _initializeIdentity(
        address identity,
        IdentityConfig memory config,
        IdentityTemplate memory template
    ) internal {
        // Initialize with template-specific logic
        if (template.initCode.length > 0) {
            (bool success,) = identity.call(
                abi.encodePacked(template.initCode, abi.encode(config))
            );
            require(success, "Identity initialization failed");
        }

        // Setup management keys
        for (uint i = 0; i < config.managementKeys.length; i++) {
            IERC734(identity).addKey(
                config.managementKeys[i],
                1, // MANAGEMENT purpose
                1  // ECDSA key type
            );
        }

        // Setup action keys
        for (uint i = 0; i < config.actionKeys.length; i++) {
            IERC734(identity).addKey(
                config.actionKeys[i],
                2, // ACTION purpose
                1  // ECDSA key type
            );
        }

        // Setup claim keys
        for (uint i = 0; i < config.claimKeys.length; i++) {
            IERC734(identity).addKey(
                config.claimKeys[i],
                3, // CLAIM purpose
                1  // ECDSA key type
            );
        }

        // Setup trusted issuers
        for (uint i = 0; i < config.trustedIssuers.length; i++) {
            IERC735(identity).addTrustedIssuer(config.trustedIssuers[i]);
        }
    }
}

Advanced Identity Factory with Governance

contract GovernanceIdentityFactory {
    struct GovernanceConfig {
        uint256 requiredApprovals;
        address[] governors;
        uint256 votingPeriod;
    }

    mapping(address => GovernanceConfig) public identityGovernance;

    function deployGovernedIdentity(
        string calldata templateName,
        IdentityConfig calldata config,
        GovernanceConfig calldata governance
    ) external returns (address identity) {
        identity = deployIdentity(templateName, config);

        // Setup governance structure
        identityGovernance[identity] = governance;

        // Initialize governance contract
        address governanceContract = _deployGovernanceContract(identity, governance);

        // Transfer identity ownership to governance contract
        IOwnable(identity).transferOwnership(governanceContract);

        emit GovernedIdentityDeployed(identity, governanceContract);
    }

    function _deployGovernanceContract(
        address identity,
        GovernanceConfig memory config
    ) internal returns (address governance) {
        // Deploy governance contract for the identity
        governance = Clones.clone(governanceImplementation);

        IGovernance(governance).initialize(
            identity,
            config.governors,
            config.requiredApprovals,
            config.votingPeriod
        );
    }
}

Template Patterns

Standard Identity Template

function createStandardIdentityTemplate() internal pure returns (IdentityTemplate memory) {
    return IdentityTemplate({
        name: "StandardIdentity",
        version: "1.0.0",
        implementation: standardIdentityImplementation,
        initCode: abi.encodeWithSignature("initialize(address)", address(0)),
        active: true
    });
}

Corporate Identity Template

function createCorporateIdentityTemplate() internal pure returns (IdentityTemplate memory) {
    return IdentityTemplate({
        name: "CorporateIdentity",
        version: "1.0.0",
        implementation: corporateIdentityImplementation,
        initCode: abi.encodeWithSignature(
            "initializeCorporate(address,string,string)",
            address(0), "", ""
        ),
        active: true
    });
}

Multi-Signature Identity Template

function createMultiSigIdentityTemplate() internal pure returns (IdentityTemplate memory) {
    return IdentityTemplate({
        name: "MultiSigIdentity",
        version: "1.0.0",
        implementation: multiSigIdentityImplementation,
        initCode: abi.encodeWithSignature(
            "initializeMultiSig(address[],uint256)",
            new address[](0), 0
        ),
        active: true
    });
}

Integration Patterns

Registry Integration

contract IdentityRegistryIntegration {
    address public identityRegistry;
    address public trustedIssuersRegistry;

    function deployWithRegistration(
        string calldata templateName,
        IdentityConfig calldata config
    ) external returns (address identity) {
        // Deploy identity
        identity = deployIdentity(templateName, config);

        // Register with identity registry
        IIdentityRegistry(identityRegistry).registerIdentity(identity, config.owner);

        // Setup trusted issuer relationships
        for (uint i = 0; i < config.trustedIssuers.length; i++) {
            ITrustedIssuersRegistry(trustedIssuersRegistry).addTrustedIssuer(
                identity,
                config.trustedIssuers[i]
            );
        }

        emit IdentityRegistered(identity, config.owner);
    }
}

KYC Integration

contract KYCIdentityFactory {
    mapping(address => bool) public kycProviders;

    function deployKYCIdentity(
        string calldata templateName,
        IdentityConfig calldata config,
        bytes calldata kycProof
    ) external returns (address identity) {
        // Verify KYC proof
        require(_verifyKYCProof(config.owner, kycProof), "Invalid KYC proof");

        // Deploy identity with KYC claim
        identity = deployIdentity(templateName, config);

        // Add KYC claim
        bytes32 claimId = keccak256("KYC_VERIFIED");
        IERC735(identity).addClaim(
            claimId,
            1, // KYC claim type
            msg.sender, // issuer
            kycProof,
            "", // claim data
            ""  // URI
        );

        emit KYCIdentityDeployed(identity, config.owner);
    }

    function _verifyKYCProof(address user, bytes memory proof) internal view returns (bool) {
        // Implement KYC proof verification logic
        return kycProviders[msg.sender];
    }
}

Security Considerations

Access Control

  • Template Creation: Restrict template registration to authorized users
  • Deployment Permissions: Control who can deploy identities
  • Key Management: Secure initial key setup
  • Registry Integration: Validate registry interactions

Identity Security

  • Key Validation: Validate all provided keys
  • Trusted Issuer Verification: Verify trusted issuer addresses
  • Initialization Safety: Ensure secure initialization process
  • Ownership Transfer: Secure ownership assignment

Factory Security

  • Template Validation: Validate template implementations
  • Implementation Security: Ensure implementation contract security
  • Upgrade Safety: Consider factory upgrade mechanisms
  • Event Logging: Log all deployments for auditing

Best Practices

Template Design

  1. Standard Compliance: Ensure ERC-734/735 compliance
  2. Modular Design: Create reusable template components
  3. Security Audits: Audit all template implementations
  4. Documentation: Document template capabilities

Factory Management

  1. Access Controls: Implement proper access controls
  2. Template Validation: Validate all template configurations
  3. Event Logging: Log all deployments and changes
  4. Upgrade Planning: Plan for factory upgrades

Identity Deployment

  1. Key Management: Secure key generation and storage
  2. Registry Integration: Integrate with identity registries
  3. Claim Setup: Setup initial claims and trusted issuers
  4. Governance: Consider governance mechanisms

Standards Compliance

  • ERC-734: Key Manager Standard
  • ERC-735: Claim Holder Standard
  • EIP-1167: Minimal Proxy Standard
  • EIP-1014: CREATE2 for deterministic addresses
  • Factory Pattern: Standard factory design patterns