Implementing Stablecoin Multi-Sig Security: Gnosis Safe V1.4 Integration

// StablecoinMultiSigController.sol
pragma solidity ^0.8.19;

import "@gnosis.pm/safe-contracts/contracts/GnosisSafe.sol";
import "@gnosis.pm/safe-contracts/contracts/proxies/GnosisSafeProxyFactory.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract StablecoinMultiSigController is Ownable {
    // Different safes for different security levels
    struct SafeConfiguration {
        address safeAddress;
        uint256 threshold;
        address[] owners;
        string purpose;
        uint256 timelock;
        bool isActive;
    }
    
    mapping(bytes32 => SafeConfiguration) public safes;
    
    // Safe types for different operations
    bytes32 public constant EMERGENCY_SAFE = keccak256("EMERGENCY_SAFE");
    bytes32 public constant OPERATIONS_SAFE = keccak256("OPERATIONS_SAFE");
    bytes32 public constant TREASURY_SAFE = keccak256("TREASURY_SAFE");
    bytes32 public constant UPGRADE_SAFE = keccak256("UPGRADE_SAFE");
    
    // Gnosis Safe factory and master copy
    GnosisSafeProxyFactory public immutable safeFactory;
    address public immutable safeMasterCopy;
    
    // Events for transparency
    event SafeCreated(bytes32 indexed safeType, address indexed safeAddress, uint256 threshold);
    event OperationExecuted(bytes32 indexed safeType, bytes32 indexed txHash, bool success);
    event ThresholdUpdated(bytes32 indexed safeType, uint256 newThreshold);
    
    constructor(address _safeFactory, address _safeMasterCopy) {
        safeFactory = GnosisSafeProxyFactory(_safeFactory);
        safeMasterCopy = _safeMasterCopy;
    }
    
    /**
     * @dev Create a new Gnosis Safe for stablecoin operations
     * @param safeType Type of safe (emergency, operations, etc.)
     * @param owners Array of owner addresses
     * @param threshold Number of required signatures
     * @param purpose Human-readable purpose description
     * @param timelock Optional timelock delay in seconds
     */
    function createSafe(
        bytes32 safeType,
        address[] calldata owners,
        uint256 threshold,
        string calldata purpose,
        uint256 timelock
    ) external onlyOwner returns (address safeAddress) {
        require(owners.length >= threshold, "Invalid threshold");
        require(threshold > 0, "Threshold must be positive");
        require(!safes[safeType].isActive, "Safe type already exists");
        
        // Prepare initialization data
        bytes memory initializer = abi.encodeWithSignature(
            "setup(address[],uint256,address,bytes,address,address,uint256,address)",
            owners,
            threshold,
            address(0), // No fallback handler
            "", // No setup data
            address(0), // No payment token
            address(0), // No payment receiver
            0, // No payment amount
            address(0) // No payment receiver
        );
        
        // Deploy safe via proxy factory
        safeAddress = address(safeFactory.createProxy(safeMasterCopy, initializer));
        
        // Store configuration
        safes[safeType] = SafeConfiguration({
            safeAddress: safeAddress,
            threshold: threshold,
            owners: owners,
            purpose: purpose,
            timelock: timelock,
            isActive: true
        });
        
        emit SafeCreated(safeType, safeAddress, threshold);
        
        return safeAddress;
    }
    
    /**
     * @dev Execute a transaction through the specified safe
     * @param safeType Type of safe to use
     * @param to Target contract address
     * @param value ETH value to send
     * @param data Transaction data
     * @param operation Call or delegate call
     * @param signatures Concatenated signatures from owners
     */
    function executeTransaction(
        bytes32 safeType,
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        bytes calldata signatures
    ) external returns (bool success) {
        SafeConfiguration memory safeConfig = safes[safeType];
        require(safeConfig.isActive, "Safe not active");
        
        GnosisSafe safe = GnosisSafe(payable(safeConfig.safeAddress));
        
        // Check timelock if applicable
        if (safeConfig.timelock > 0) {
            require(block.timestamp >= getTransactionTimelock(safeType, to, data), 
                    "Timelock not expired");
        }
        
        // Execute transaction
        success = safe.execTransaction(
            to,
            value,
            data,
            operation,
            0, // safeTxGas
            0, // baseGas
            0, // gasPrice
            address(0), // gasToken
            payable(address(0)), // refundReceiver (no refund)
            signatures
        );
        
        // Log execution
        bytes32 txHash = safe.getTransactionHash(
            to, value, data, operation, 0, 0, 0, address(0), address(0), 
            safe.nonce() - 1
        );
        
        emit OperationExecuted(safeType, txHash, success);
        
        return success;
    }
}

// StablecoinSafeManager.sol - Manages different safe types
contract StablecoinSafeManager {
    StablecoinMultiSigController public controller;
    
    // Safe configuration templates
    struct SafeTemplate {
        uint256 minOwners;
        uint256 recommendedThreshold;
        uint256 timelock;
        string[] requiredRoles;
    }
    
    mapping(bytes32 => SafeTemplate) public safeTemplates;
    
    constructor(address _controller) {
        controller = StablecoinMultiSigController(_controller);
        _initializeTemplates();
    }
    
    function _initializeTemplates() internal {
        // Emergency Safe - for pausing/unpausing during attacks
        safeTemplates[controller.EMERGENCY_SAFE()] = SafeTemplate({
            minOwners: 5,
            recommendedThreshold: 3, // 3 of 5 for fast response
            timelock: 0, // No timelock for emergencies
            requiredRoles: ["Security Lead", "CTO", "CEO", "External Security Expert", "Community Rep"]
        });
        
        // Operations Safe - for routine parameter changes
        safeTemplates[controller.OPERATIONS_SAFE()] = SafeTemplate({
            minOwners: 7,
            recommendedThreshold: 4, // 4 of 7 for operational changes
            timelock: 24 hours, // 24 hour timelock
            requiredRoles: ["Product Lead", "Risk Manager", "Compliance", "Engineering Lead", 
                           "External Auditor", "Community Rep", "Advisor"]
        });
        
        // Treasury Safe - for protocol fund management
        safeTemplates[controller.TREASURY_SAFE()] = SafeTemplate({
            minOwners: 9,
            recommendedThreshold: 6, // 6 of 9 for high-value operations
            timelock: 72 hours, // 3 day timelock
            requiredRoles: ["CFO", "CEO", "Board Member 1", "Board Member 2", "Board Member 3",
                           "External Auditor", "Legal Counsel", "Community Rep", "Independent Director"]
        });
        
        // Upgrade Safe - for smart contract upgrades
        safeTemplates[controller.UPGRADE_SAFE()] = SafeTemplate({
            minOwners: 11,
            recommendedThreshold: 7, // 7 of 11 for upgrades
            timelock: 168 hours, // 7 day timelock
            requiredRoles: ["Lead Engineer", "Security Lead", "External Auditor 1", "External Auditor 2",
                           "CEO", "CTO", "Legal Counsel", "Community Rep", "Academic Advisor",
                           "Governance Council Rep", "Independent Security Expert"]
        });
    }
    
    /**
     * @dev Create all necessary safes for a stablecoin protocol
     * @param owners Mapping of safe type to owner addresses
     */
    function deployCompleteSafeInfrastructure(
        mapping(bytes32 => address[]) storage owners
    ) external onlyOwner {
        bytes32[] memory safeTypes = [
            controller.EMERGENCY_SAFE(),
            controller.OPERATIONS_SAFE(),
            controller.TREASURY_SAFE(),
            controller.UPGRADE_SAFE()
        ];
        
        for (uint256 i = 0; i < safeTypes.length; i++) {
            bytes32 safeType = safeTypes[i];
            SafeTemplate memory template = safeTemplates[safeType];
            address[] memory safeOwners = owners[safeType];
            
            require(safeOwners.length >= template.minOwners, "Insufficient owners");
            
            controller.createSafe(
                safeType,
                safeOwners,
                template.recommendedThreshold,
                string(abi.encodePacked("Stablecoin ", _safeTypeToString(safeType))),
                template.timelock
            );
        }
    }
}

// StablecoinTransactionManager.sol
contract StablecoinTransactionManager {
    using SafeMath for uint256;
    
    struct PendingTransaction {
        bytes32 safeType;
        address to;
        uint256 value;
        bytes data;
        Enum.Operation operation;
        uint256 submissionTime;
        uint256 executionTime;
        address[] approvers;
        bool executed;
        string description;
    }
    
    mapping(bytes32 => PendingTransaction) public pendingTransactions;
    mapping(bytes32 => mapping(address => bool)) public hasApproved;
    
    StablecoinMultiSigController public controller;
    
    // Transaction categorization for different approval flows
    enum TransactionType {
        EMERGENCY_PAUSE,
        PARAMETER_CHANGE,
        TREASURY_TRANSFER,
        CONTRACT_UPGRADE,
        MINTING_RIGHTS,
        BURNING_OPERATION
    }
    
    event TransactionSubmitted(
        bytes32 indexed txId,
        address indexed submitter,
        TransactionType txType,
        string description
    );
    
    event TransactionApproved(
        bytes32 indexed txId,
        address indexed approver,
        uint256 approvalCount
    );
    
    event TransactionExecuted(
        bytes32 indexed txId,
        bool success,
        uint256 executionTime
    );
    
    /**
     * @dev Submit a new transaction for multi-sig approval
     * @param safeType Which safe should execute this transaction
     * @param to Target contract address
     * @param value ETH value to send
     * @param data Transaction data
     * @param operation Call or delegate call
     * @param txType Type of transaction for categorization
     * @param description Human-readable description
     */
    function submitTransaction(
        bytes32 safeType,
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation,
        TransactionType txType,
        string calldata description
    ) external returns (bytes32 txId) {
        // Verify submitter is a safe owner
        require(isOwnerOfSafe(safeType, msg.sender), "Not authorized");
        
        // Generate unique transaction ID
        txId = keccak256(abi.encodePacked(
            safeType, to, value, data, operation, block.timestamp, msg.sender
        ));
        
        // Store pending transaction
        pendingTransactions[txId] = PendingTransaction({
            safeType: safeType,
            to: to,
            value: value,
            data: data,
            operation: operation,
            submissionTime: block.timestamp,
            executionTime: 0,
            approvers: new address[](0),
            executed: false,
            description: description
        });
        
        // Auto-approve for submitter
        _approveTransaction(txId, msg.sender);
        
        emit TransactionSubmitted(txId, msg.sender, txType, description);
        
        return txId;
    }
    
    /**
     * @dev Approve a pending transaction
     * @param txId Transaction ID to approve
     */
    function approveTransaction(bytes32 txId) external {
        PendingTransaction storage tx = pendingTransactions[txId];
        require(tx.submissionTime > 0, "Transaction not found");
        require(!tx.executed, "Already executed");
        require(isOwnerOfSafe(tx.safeType, msg.sender), "Not authorized");
        require(!hasApproved[txId][msg.sender], "Already approved");
        
        _approveTransaction(txId, msg.sender);
    }
    
    function _approveTransaction(bytes32 txId, address approver) internal {
        hasApproved[txId][approver] = true;
        pendingTransactions[txId].approvers.push(approver);
        
        uint256 approvalCount = pendingTransactions[txId].approvers.length;
        emit TransactionApproved(txId, approver, approvalCount);
        
        // Auto-execute if threshold reached and timelock passed
        if (canExecuteTransaction(txId)) {
            _executeTransaction(txId);
        }
    }
    
    /**
     * @dev Execute a transaction that has sufficient approvals
     * @param txId Transaction ID to execute
     */
    function executeTransaction(bytes32 txId) external {
        require(canExecuteTransaction(txId), "Cannot execute");
        _executeTransaction(txId);
    }
    
    function _executeTransaction(bytes32 txId) internal {
        PendingTransaction storage tx = pendingTransactions[txId];
        
        // Generate signatures (simplified - in practice, collect real signatures)
        bytes memory signatures = generateSignatures(txId);
        
        // Execute through controller
        bool success = controller.executeTransaction(
            tx.safeType,
            tx.to,
            tx.value,
            tx.data,
            tx.operation,
            signatures
        );
        
        tx.executed = true;
        tx.executionTime = block.timestamp;
        
        emit TransactionExecuted(txId, success, block.timestamp);
    }
    
    /**
     * @dev Check if transaction can be executed
     * @param txId Transaction ID to check
     */
    function canExecuteTransaction(bytes32 txId) public view returns (bool) {
        PendingTransaction memory tx = pendingTransactions[txId];
        
        if (tx.executed || tx.submissionTime == 0) {
            return false;
        }
        
        // Check if sufficient approvals
        (,uint256 threshold,,,) = controller.safes(tx.safeType);
        if (tx.approvers.length < threshold) {
            return false;
        }
        
        // Check timelock
        (,,,,uint256 timelock,) = controller.safes(tx.safeType);
        if (timelock > 0 && block.timestamp < tx.submissionTime.add(timelock)) {
            return false;
        }
        
        return true;
    }
}

// EmergencyPauseManager.sol
contract EmergencyPauseManager {
    StablecoinMultiSigController public controller;
    address public stablecoinContract;
    
    struct EmergencyAction {
        uint256 timestamp;
        address trigger;
        string reason;
        bool resolved;
    }
    
    mapping(uint256 => EmergencyAction) public emergencyActions;
    uint256 public emergencyCount;
    
    // Emergency triggers - can pause without full multi-sig
    mapping(address => bool) public emergencyTriggers;
    
    // Circuit breaker parameters
    uint256 public constant MAX_EMERGENCY_PAUSE_TIME = 72 hours;
    uint256 public lastEmergencyPause;
    
    event EmergencyPauseTriggered(
        uint256 indexed emergencyId,
        address indexed trigger,
        string reason
    );
    
    event EmergencyResolved(
        uint256 indexed emergencyId,
        address indexed resolver
    );
    
    modifier onlyEmergencyTrigger() {
        require(emergencyTriggers[msg.sender], "Not emergency trigger");
        _;
    }
    
    modifier onlyEmergencySafe() {
        (, address emergencySafeAddress,,,) = controller.safes(controller.EMERGENCY_SAFE());
        require(msg.sender == emergencySafeAddress, "Only emergency safe");
        _;
    }
    
    /**
     * @dev Trigger emergency pause (can be called by designated triggers)
     * @param reason Explanation for emergency pause
     */
    function triggerEmergencyPause(string calldata reason) external onlyEmergencyTrigger {
        require(block.timestamp > lastEmergencyPause + 24 hours, "Emergency cooldown active");
        
        // Pause the stablecoin contract
        IStablecoin(stablecoinContract).pause();
        
        // Record emergency action
        emergencyActions[emergencyCount] = EmergencyAction({
            timestamp: block.timestamp,
            trigger: msg.sender,
            reason: reason,
            resolved: false
        });
        
        lastEmergencyPause = block.timestamp;
        
        emit EmergencyPauseTriggered(emergencyCount, msg.sender, reason);
        emergencyCount++;
        
        // Auto-schedule unpause after maximum emergency time
        _scheduleAutoUnpause();
    }
    
    /**
     * @dev Resolve emergency and unpause (requires emergency safe approval)
     * @param emergencyId Emergency to resolve
     */
    function resolveEmergency(uint256 emergencyId) external onlyEmergencySafe {
        require(emergencyId < emergencyCount, "Invalid emergency ID");
        require(!emergencyActions[emergencyId].resolved, "Already resolved");
        
        // Unpause the contract
        IStablecoin(stablecoinContract).unpause();
        
        // Mark emergency as resolved
        emergencyActions[emergencyId].resolved = true;
        
        emit EmergencyResolved(emergencyId, msg.sender);
    }
    
    /**
     * @dev Add emergency trigger address
     * @param trigger Address to add as emergency trigger
     */
    function addEmergencyTrigger(address trigger) external onlyEmergencySafe {
        emergencyTriggers[trigger] = true;
    }
    
    /**
     * @dev Remove emergency trigger address
     * @param trigger Address to remove as emergency trigger
     */
    function removeEmergencyTrigger(address trigger) external onlyEmergencySafe {
        emergencyTriggers[trigger] = false;
    }
    
    function _scheduleAutoUnpause() internal {
        // In a real implementation, this would use a time-based unpause mechanism
        // For now, we just ensure the emergency safe can always unpause
    }
}

// SecurityLevelManager.sol
contract SecurityLevelManager {
    enum SecurityLevel {
        NORMAL,     // Standard operations
        ELEVATED,   // Increased monitoring
        HIGH,       // Additional approvals required
        CRITICAL,   // Maximum security measures
        LOCKDOWN    // Only emergency operations
    }
    
    SecurityLevel public currentSecurityLevel = SecurityLevel.NORMAL;
    
    struct SecurityLevelConfig {
        uint256 additionalApprovals;
        uint256 additionalTimelock;
        bool requiresExternalAudit;
        bool restrictedOperations;
    }
    
    mapping(SecurityLevel => SecurityLevelConfig) public securityConfigs;
    
    constructor() {
        // Configure security levels
        securityConfigs[SecurityLevel.NORMAL] = SecurityLevelConfig({
            additionalApprovals: 0,
            additionalTimelock: 0,
            requiresExternalAudit: false,
            restrictedOperations: false
        });
        
        securityConfigs[SecurityLevel.ELEVATED] = SecurityLevelConfig({
            additionalApprovals: 1,
            additionalTimelock: 12 hours,
            requiresExternalAudit: false,
            restrictedOperations: false
        });
        
        securityConfigs[SecurityLevel.HIGH] = SecurityLevelConfig({
            additionalApprovals: 2,
            additionalTimelock: 48 hours,
            requiresExternalAudit: true,
            restrictedOperations: false
        });
        
        securityConfigs[SecurityLevel.CRITICAL] = SecurityLevelConfig({
            additionalApprovals: 3,
            additionalTimelock: 168 hours, // 1 week
            requiresExternalAudit: true,
            restrictedOperations: true
        });
        
        securityConfigs[SecurityLevel.LOCKDOWN] = SecurityLevelConfig({
            additionalApprovals: 999, // Effectively blocks non-emergency operations
            additionalTimelock: 999 days,
            requiresExternalAudit: true,
            restrictedOperations: true
        });
    }
    
    /**
     * @dev Escalate security level
     * @param newLevel New security level to set
     * @param reason Reason for escalation
     */
    function escalateSecurityLevel(
        SecurityLevel newLevel,
        string calldata reason
    ) external onlyEmergencySafe {
        require(newLevel > currentSecurityLevel, "Cannot downgrade with this function");
        
        SecurityLevel oldLevel = currentSecurityLevel;
        currentSecurityLevel = newLevel;
        
        emit SecurityLevelChanged(oldLevel, newLevel, reason);
    }
    
    /**
     * @dev Get required approvals for current security level
     * @param baseApprovals Base number of approvals needed
     */
    function getRequiredApprovals(uint256 baseApprovals) external view returns (uint256) {
        return baseApprovals + securityConfigs[currentSecurityLevel].additionalApprovals;
    }
    
    /**
     * @dev Get required timelock for current security level
     * @param baseTimelock Base timelock period
     */
    function getRequiredTimelock(uint256 baseTimelock) external view returns (uint256) {
        return baseTimelock + securityConfigs[currentSecurityLevel].additionalTimelock;
    }
}

// SafeOwnerManager.sol
contract SafeOwnerManager {
    struct OwnerRotationProposal {
        address safeAddress;
        address currentOwner;
        address newOwner;
        uint256 proposedAt;
        uint256 executionTime;
        bool executed;
        string reason;
    }
    
    mapping(bytes32 => OwnerRotationProposal) public rotationProposals;
    mapping(address => uint256) public lastRotation;
    
    uint256 public constant MIN_ROTATION_PERIOD = 90 days;
    uint256 public constant ROTATION_TIMELOCK = 48 hours;
    
    event OwnerRotationProposed(
        bytes32 indexed proposalId,
        address indexed safeAddress,
        address indexed currentOwner,
        address newOwner
    );
    
    event OwnerRotationExecuted(
        bytes32 indexed proposalId,
        address indexed safeAddress,
        address newOwner
    );
    
    /**
     * @dev Propose owner rotation for a safe
     * @param safeAddress Address of the safe
     * @param currentOwner Current owner to replace
     * @param newOwner New owner address
     * @param reason Reason for rotation
     */
    function proposeOwnerRotation(
        address safeAddress,
        address currentOwner,
        address newOwner,
        string calldata reason
    ) external returns (bytes32 proposalId) {
        require(GnosisSafe(payable(safeAddress)).isOwner(currentOwner), "Not current owner");
        require(!GnosisSafe(payable(safeAddress)).isOwner(newOwner), "Already owner");
        require(newOwner != address(0), "Invalid new owner");
        
        // Check rotation period
        require(block.timestamp >= lastRotation[currentOwner] + MIN_ROTATION_PERIOD,
                "Rotation too frequent");
        
        proposalId = keccak256(abi.encodePacked(
            safeAddress, currentOwner, newOwner, block.timestamp
        ));
        
        rotationProposals[proposalId] = OwnerRotationProposal({
            safeAddress: safeAddress,
            currentOwner: currentOwner,
            newOwner: newOwner,
            proposedAt: block.timestamp,
            executionTime: block.timestamp + ROTATION_TIMELOCK,
            executed: false,
            reason: reason
        });
        
        emit OwnerRotationProposed(proposalId, safeAddress, currentOwner, newOwner);
        
        return proposalId;
    }
    
    /**
     * @dev Execute approved owner rotation
     * @param proposalId Rotation proposal to execute
     */
    function executeOwnerRotation(bytes32 proposalId) external {
        OwnerRotationProposal storage proposal = rotationProposals[proposalId];
        
        require(!proposal.executed, "Already executed");
        require(block.timestamp >= proposal.executionTime, "Timelock not expired");
        
        GnosisSafe safe = GnosisSafe(payable(proposal.safeAddress));
        
        // Perform owner swap
        address[] memory owners = safe.getOwners();
        address prevOwner = _findPrevOwner(owners, proposal.currentOwner);
        
        // Execute owner swap transaction
        bool success = safe.execTransaction(
            proposal.safeAddress,
            0,
            abi.encodeWithSignature(
                "swapOwner(address,address,address)",
                prevOwner,
                proposal.currentOwner,
                proposal.newOwner
            ),
            Enum.Operation.Call,
            0, 0, 0, address(0), payable(address(0)),
            "" // This would need proper signatures in practice
        );
        
        require(success, "Owner rotation failed");
        
        proposal.executed = true;
        lastRotation[proposal.newOwner] = block.timestamp;
        
        emit OwnerRotationExecuted(proposalId, proposal.safeAddress, proposal.newOwner);
    }
    
    function _findPrevOwner(address[] memory owners, address owner) 
        internal 
        pure 
        returns (address) 
    {
        for (uint256 i = 0; i < owners.length; i++) {
            if (owners[i] == owner) {
                if (i == 0) {
                    return address(0x1); // SENTINEL_OWNERS
                } else {
                    return owners[i - 1];
                }
            }
        }
        revert("Owner not found");
    }
}

// SafeMonitoringSystem.sol
contract SafeMonitoringSystem {
    struct MonitoringRule {
        uint256 maxTransactionValue;
        uint256 maxDailyVolume;
        uint256 suspiciousPatternThreshold;
        bool isActive;
    }
    
    mapping(address => MonitoringRule) public safeRules;
    mapping(address => uint256) public dailyVolume;
    mapping(address => uint256) public lastVolumeReset;
    
    event SuspiciousActivityDetected(
        address indexed safeAddress,
        string alertType,
        uint256 value,
        bytes data
    );
    
    event MonitoringRuleTriggered(
        address indexed safeAddress,
        string ruleType,
        uint256 threshold,
        uint256 actual
    );
    
    /**
     * @dev Monitor transaction before execution
     * @param safeAddress Safe executing the transaction
     * @param to Target address
     * @param value Transaction value
     * @param data Transaction data
     */
    function monitorTransaction(
        address safeAddress,
        address to,
        uint256 value,
        bytes calldata data
    ) external returns (bool shouldProceed) {
        MonitoringRule memory rule = safeRules[safeAddress];
        if (!rule.isActive) return true;
        
        // Check transaction value limit
        if (value > rule.maxTransactionValue) {
            emit MonitoringRuleTriggered(
                safeAddress, 
                "MAX_TRANSACTION_VALUE", 
                rule.maxTransactionValue, 
                value
            );
            return false;
        }
        
        // Check daily volume limit
        _updateDailyVolume(safeAddress, value);
        if (dailyVolume[safeAddress] > rule.maxDailyVolume) {
            emit MonitoringRuleTriggered(
                safeAddress,
                "DAILY_VOLUME_EXCEEDED",
                rule.maxDailyVolume,
                dailyVolume[safeAddress]
            );
            return false;
        }
        
        // Check for suspicious patterns
        if (_detectSuspiciousPattern(safeAddress, to, value, data)) {
            emit SuspiciousActivityDetected(
                safeAddress,
                "SUSPICIOUS_PATTERN",
                value,
                data
            );
            return false;
        }
        
        return true;
    }
    
    function _updateDailyVolume(address safeAddress, uint256 value) internal {
        // Reset daily volume if it's a new day
        if (block.timestamp >= lastVolumeReset[safeAddress] + 1 days) {
            dailyVolume[safeAddress] = 0;
            lastVolumeReset[safeAddress] = block.timestamp;
        }
        
        dailyVolume[safeAddress] += value;
    }
    
    function _detectSuspiciousPattern(
        address safeAddress,
        address to,
        uint256 value,
        bytes calldata data
    ) internal view returns (bool) {
        // Implement pattern detection logic
        // This is simplified - real implementation would be more sophisticated
        
        // Check for unusual target addresses
        if (to == address(0) || to == safeAddress) {
            return true;
        }
        
        // Check for unusual function calls
        if (data.length >= 4) {
            bytes4 functionSelector = bytes4(data[:4]);
            
            // Flag dangerous functions
            if (functionSelector == bytes4(keccak256("selfdestruct(address)")) ||
                functionSelector == bytes4(keccak256("delegatecall(uint256,bytes)"))) {
                return true;
            }
        }
        
        return false;
    }
}

// StablecoinAccessControl.sol
contract StablecoinAccessControl {
    using AccessControl for AccessControl.RoleData;
    
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
    bytes32 public constant UPGRADER_ROLE = keccak256("UPGRADER_ROLE");
    
    // Multi-sig safes that control different roles
    mapping(bytes32 => address) public roleSafes;
    
    event RoleSafeUpdated(bytes32 indexed role, address indexed safeAddress);
    
    modifier onlyRoleSafe(bytes32 role) {
        require(msg.sender == roleSafes[role], "Unauthorized safe");
        _;
    }
    
    /**
     * @dev Set which safe controls a specific role
     * @param role Role to configure
     * @param safeAddress Safe that should control this role
     */
    function setRoleSafe(bytes32 role, address safeAddress) external onlyRole(DEFAULT_ADMIN_ROLE) {
        roleSafes[role] = safeAddress;
        emit RoleSafeUpdated(role, safeAddress);
    }
    
    /**
     * @dev Grant role through multi-sig safe
     * @param role Role to grant
     * @param account Account to grant role to
     */
    function grantRoleViaSafe(bytes32 role, address account) external onlyRoleSafe(role) {
        _grantRole(role, account);
    }
    
    /**
     * @dev Revoke role through multi-sig safe
     * @param role Role to revoke
     * @param account Account to revoke role from
     */
    function revokeRoleViaSafe(bytes32 role, address account) external onlyRoleSafe(role) {
        _revokeRole(role, account);
    }
    
    /**
     * @dev Emergency pause function (only emergency safe)
     */
    function emergencyPause() external onlyRoleSafe(PAUSER_ROLE) {
        _pause();
    }
    
    /**
     * @dev Unpause function (only emergency safe)
     */
    function emergencyUnpause() external onlyRoleSafe(PAUSER_ROLE) {
        _unpause();
    }
}