/**
 * Security event types for audit logging
 */
export declare enum SecurityEventType {
    AuthenticationAttempt = "AUTH_ATTEMPT",
    AuthenticationSuccess = "AUTH_SUCCESS",
    AuthenticationFailure = "AUTH_FAILURE",
    SignatureValidationSuccess = "SIG_VALID",
    SignatureValidationFailure = "SIG_INVALID",
    SignatureCreated = "SIG_CREATED",
    BlockCreated = "BLOCK_CREATED",
    BlockValidated = "BLOCK_VALIDATED",
    BlockValidationFailed = "BLOCK_VALIDATION_FAILED",
    EncryptionPerformed = "ENCRYPTED",
    DecryptionPerformed = "DECRYPTED",
    DecryptionFailed = "DECRYPT_FAILED",
    AccessDenied = "ACCESS_DENIED",
    UnauthorizedAccess = "UNAUTHORIZED",
    RateLimitExceeded = "RATE_LIMIT_EXCEEDED",
    InvalidInput = "INVALID_INPUT",
    SuspiciousActivity = "SUSPICIOUS"
}
/**
 * Security event severity levels
 */
export declare enum SecurityEventSeverity {
    Info = "INFO",
    Warning = "WARNING",
    Error = "ERROR",
    Critical = "CRITICAL"
}
/**
 * Security event data structure
 */
export interface SecurityEvent {
    timestamp: Date;
    type: SecurityEventType;
    severity: SecurityEventSeverity;
    message: string;
    correlationId?: string;
    userId?: string;
    blockId?: string;
    metadata?: Record<string, unknown>;
}
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