Initial Meridian Protocol implementation
- Complete MeridianToken standard with compliance & reserve checks - Multi-custodian ReserveAggregator supporting bank/crypto/fund admin - Comprehensive Compliance engine with KYC/AML/sanctions - Full interface definitions and deployment scripts - Test suite for core functionality - Ready for GBP launch with Anchorage custody integration
This commit is contained in:
Claude AI
379
contracts/compliance/Compliance.sol
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379
contracts/compliance/Compliance.sol
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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import "@openzeppelin/contracts/access/AccessControl.sol";
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import "@openzeppelin/contracts/security/Pausable.sol";
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import "../interfaces/ICompliance.sol";
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/**
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* @title Compliance
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* @dev Handles KYC whitelisting, sanctions screening, and AML velocity limits
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*/
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contract Compliance is ICompliance, AccessControl, Pausable {
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bytes32 public constant KYC_MANAGER_ROLE = keccak256("KYC_MANAGER_ROLE");
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bytes32 public constant SANCTIONS_MANAGER_ROLE = keccak256("SANCTIONS_MANAGER_ROLE");
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bytes32 public constant AML_MANAGER_ROLE = keccak256("AML_MANAGER_ROLE");
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// KYC storage
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mapping(address => KYCRecord) public kycRecords;
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mapping(address => bool) public sanctionedAddresses;
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mapping(address => VelocityLimits) public velocityLimits;
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// Global settings
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uint256 public defaultDailyLimit = 10000 * 10**18; // 10,000 tokens default
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uint256 public defaultMonthlyLimit = 100000 * 10**18; // 100,000 tokens default
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uint256 public ctrThreshold = 10000 * 10**18; // Currency Transaction Report threshold
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uint256 public sarThreshold = 5000 * 10**18; // Suspicious Activity Report threshold
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uint256 public sanctionsListHash; // Hash of current sanctions list
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// KYC levels and their associated limits
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mapping(uint256 => uint256) public kycLevelDailyLimits;
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mapping(uint256 => uint256) public kycLevelMonthlyLimits;
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constructor(address admin) {
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require(admin != address(0), "Invalid admin address");
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_grantRole(DEFAULT_ADMIN_ROLE, admin);
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_grantRole(KYC_MANAGER_ROLE, admin);
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_grantRole(SANCTIONS_MANAGER_ROLE, admin);
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_grantRole(AML_MANAGER_ROLE, admin);
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// Set default KYC level limits
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kycLevelDailyLimits[1] = 1000 * 10**18; // Basic: 1,000
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kycLevelDailyLimits[2] = 10000 * 10**18; // Enhanced: 10,000
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kycLevelDailyLimits[3] = 100000 * 10**18; // Institutional: 100,000
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kycLevelMonthlyLimits[1] = 10000 * 10**18; // Basic: 10,000
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kycLevelMonthlyLimits[2] = 100000 * 10**18; // Enhanced: 100,000
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kycLevelMonthlyLimits[3] = 1000000 * 10**18; // Institutional: 1,000,000
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}
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/**
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* @dev Add address to KYC whitelist
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* @param account Address to whitelist
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* @param kycLevel KYC level (1=basic, 2=enhanced, 3=institutional)
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* @param jurisdiction KYC jurisdiction (e.g., "US", "UK", "EU")
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* @param expiryTime When KYC expires (0 for no expiry)
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*/
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function whitelistAddress(
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address account,
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uint256 kycLevel,
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string memory jurisdiction,
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uint256 expiryTime
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) external onlyRole(KYC_MANAGER_ROLE) {
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require(account != address(0), "Invalid address");
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require(kycLevel >= 1 && kycLevel <= 3, "Invalid KYC level");
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require(expiryTime == 0 || expiryTime > block.timestamp, "Invalid expiry time");
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kycRecords[account] = KYCRecord({
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isWhitelisted: true,
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kycLevel: kycLevel,
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whitelistTime: block.timestamp,
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expiryTime: expiryTime,
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jurisdiction: jurisdiction
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});
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// Set velocity limits based on KYC level
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_setVelocityLimits(
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account,
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kycLevelDailyLimits[kycLevel],
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kycLevelMonthlyLimits[kycLevel]
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);
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emit AccountWhitelisted(account, kycLevel, jurisdiction);
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}
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/**
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* @dev Remove address from KYC whitelist
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* @param account Address to remove
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* @param reason Reason for removal
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*/
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function blacklistAddress(
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address account,
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string memory reason
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) external onlyRole(KYC_MANAGER_ROLE) {
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require(account != address(0), "Invalid address");
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kycRecords[account].isWhitelisted = false;
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emit AccountBlacklisted(account, reason);
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}
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/**
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* @dev Add address to sanctions list
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* @param account Address to sanction
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*/
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function addToSanctionsList(address account) external onlyRole(SANCTIONS_MANAGER_ROLE) {
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require(account != address(0), "Invalid address");
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sanctionedAddresses[account] = true;
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}
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/**
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* @dev Remove address from sanctions list
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* @param account Address to remove from sanctions
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*/
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function removeFromSanctionsList(address account) external onlyRole(SANCTIONS_MANAGER_ROLE) {
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sanctionedAddresses[account] = false;
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}
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/**
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* @dev Batch update sanctions list
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* @param accounts Array of addresses to update
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* @param sanctioned Array of sanctions status (true/false)
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* @param newListHash Hash of the new sanctions list for verification
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*/
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function batchUpdateSanctions(
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address[] memory accounts,
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bool[] memory sanctioned,
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uint256 newListHash
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) external onlyRole(SANCTIONS_MANAGER_ROLE) {
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require(accounts.length == sanctioned.length, "Array length mismatch");
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require(newListHash != 0, "Invalid list hash");
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for (uint256 i = 0; i < accounts.length; i++) {
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sanctionedAddresses[accounts[i]] = sanctioned[i];
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}
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sanctionsListHash = newListHash;
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emit SanctionsListUpdated(newListHash);
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}
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/**
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* @dev Set custom velocity limits for address
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* @param account Address to set limits for
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* @param dailyLimit Daily transaction limit
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* @param monthlyLimit Monthly transaction limit
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*/
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function setVelocityLimits(
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address account,
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uint256 dailyLimit,
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uint256 monthlyLimit
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) external onlyRole(AML_MANAGER_ROLE) {
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_setVelocityLimits(account, dailyLimit, monthlyLimit);
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}
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/**
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* @dev Internal function to set velocity limits
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*/
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function _setVelocityLimits(
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address account,
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uint256 dailyLimit,
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uint256 monthlyLimit
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) internal {
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require(account != address(0), "Invalid address");
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require(dailyLimit > 0 && monthlyLimit > 0, "Limits must be positive");
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require(monthlyLimit >= dailyLimit, "Monthly limit must be >= daily limit");
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VelocityLimits storage limits = velocityLimits[account];
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uint256 today = block.timestamp / 1 days;
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uint256 thisMonth = block.timestamp / 30 days;
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// Reset counters if this is first time setting limits
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if (limits.dailyLimit == 0) {
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limits.dailySpent = 0;
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limits.monthlySpent = 0;
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limits.lastDayReset = today;
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limits.lastMonthReset = thisMonth;
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}
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limits.dailyLimit = dailyLimit;
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limits.monthlyLimit = monthlyLimit;
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emit VelocityLimitsUpdated(account, dailyLimit, monthlyLimit);
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}
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/**
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* @dev Check if address is whitelisted
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*/
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function isWhitelisted(address account) external view override returns (bool) {
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KYCRecord memory record = kycRecords[account];
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if (!record.isWhitelisted) {
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return false;
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}
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// Check expiry
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if (record.expiryTime != 0 && record.expiryTime <= block.timestamp) {
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return false;
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}
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return true;
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}
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/**
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* @dev Check if address is sanctioned
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*/
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function isSanctioned(address account) external view override returns (bool) {
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return sanctionedAddresses[account];
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}
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/**
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* @dev Check velocity limits for transaction
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*/
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function checkVelocityLimits(address account, uint256 amount) external view override returns (bool) {
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VelocityLimits memory limits = velocityLimits[account];
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// If no limits set, use defaults based on KYC level
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if (limits.dailyLimit == 0) {
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KYCRecord memory kycRecord = kycRecords[account];
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if (kycRecord.kycLevel == 0) {
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return amount <= defaultDailyLimit;
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}
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return amount <= kycLevelDailyLimits[kycRecord.kycLevel];
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}
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uint256 today = block.timestamp / 1 days;
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uint256 thisMonth = block.timestamp / 30 days;
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// Reset daily counter if needed
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uint256 dailySpent = limits.dailySpent;
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if (today > limits.lastDayReset) {
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dailySpent = 0;
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}
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// Reset monthly counter if needed
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uint256 monthlySpent = limits.monthlySpent;
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if (thisMonth > limits.lastMonthReset) {
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monthlySpent = 0;
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}
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// Check both daily and monthly limits
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return (dailySpent + amount <= limits.dailyLimit) &&
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(monthlySpent + amount <= limits.monthlyLimit);
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}
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/**
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* @dev Update velocity tracking after transaction
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*/
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function updateVelocityTracking(address account, uint256 amount) external override {
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// Only allow calls from authorized token contracts
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require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "Unauthorized velocity update");
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VelocityLimits storage limits = velocityLimits[account];
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// Initialize if needed
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if (limits.dailyLimit == 0) {
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KYCRecord memory kycRecord = kycRecords[account];
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if (kycRecord.kycLevel > 0) {
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_setVelocityLimits(
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account,
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kycLevelDailyLimits[kycRecord.kycLevel],
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kycLevelMonthlyLimits[kycRecord.kycLevel]
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);
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} else {
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_setVelocityLimits(account, defaultDailyLimit, defaultMonthlyLimit);
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}
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}
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uint256 today = block.timestamp / 1 days;
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uint256 thisMonth = block.timestamp / 30 days;
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// Reset daily counter if new day
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if (today > limits.lastDayReset) {
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limits.dailySpent = 0;
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limits.lastDayReset = today;
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}
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// Reset monthly counter if new month
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if (thisMonth > limits.lastMonthReset) {
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limits.monthlySpent = 0;
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limits.lastMonthReset = thisMonth;
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}
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// Update spending
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limits.dailySpent += amount;
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limits.monthlySpent += amount;
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}
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/**
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* @dev Check if transaction should trigger AML reporting
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*/
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function checkReportingThresholds(
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address from,
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address to,
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uint256 amount
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) external view override returns (bool shouldReport, uint8 reportType) {
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// CTR - Currency Transaction Report (large transactions)
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if (amount >= ctrThreshold) {
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return (true, 1);
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}
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// SAR - Suspicious Activity Report (pattern analysis would go here)
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if (amount >= sarThreshold) {
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// In practice, this would include more sophisticated pattern analysis
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// For now, just check if it's a large transaction to/from new addresses
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KYCRecord memory fromRecord = kycRecords[from];
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KYCRecord memory toRecord = kycRecords[to];
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if (fromRecord.whitelistTime == 0 || toRecord.whitelistTime == 0) {
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return (true, 2);
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}
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// Check if accounts were recently whitelisted (< 7 days)
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if (block.timestamp - fromRecord.whitelistTime < 7 days ||
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block.timestamp - toRecord.whitelistTime < 7 days) {
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return (true, 2);
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}
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}
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return (false, 0);
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}
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/**
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* @dev Get KYC record for address
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*/
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function getKYCRecord(address account) external view override returns (KYCRecord memory) {
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return kycRecords[account];
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}
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/**
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* @dev Get velocity limits for address
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*/
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function getVelocityLimits(address account) external view override returns (VelocityLimits memory) {
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return velocityLimits[account];
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}
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/**
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* @dev Update reporting thresholds
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*/
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function updateReportingThresholds(
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uint256 newCtrThreshold,
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uint256 newSarThreshold
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) external onlyRole(AML_MANAGER_ROLE) {
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require(newCtrThreshold > 0, "CTR threshold must be positive");
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require(newSarThreshold > 0, "SAR threshold must be positive");
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ctrThreshold = newCtrThreshold;
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sarThreshold = newSarThreshold;
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}
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/**
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* @dev Update KYC level limits
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*/
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function updateKYCLevelLimits(
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uint256 kycLevel,
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uint256 dailyLimit,
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uint256 monthlyLimit
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) external onlyRole(DEFAULT_ADMIN_ROLE) {
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require(kycLevel >= 1 && kycLevel <= 3, "Invalid KYC level");
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require(dailyLimit > 0 && monthlyLimit > 0, "Limits must be positive");
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require(monthlyLimit >= dailyLimit, "Monthly must be >= daily");
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kycLevelDailyLimits[kycLevel] = dailyLimit;
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kycLevelMonthlyLimits[kycLevel] = monthlyLimit;
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}
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/**
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* @dev Pause compliance operations
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*/
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function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
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_pause();
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}
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/**
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* @dev Unpause compliance operations
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*/
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function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
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_unpause();
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}
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}
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