# Commitment backend: 'memory' | 'rekor'
COMMITMENT_BACKEND=rekor

# Archive backend: 'memory' | 's3'
ARCHIVE_BACKEND=s3

interface CommitmentBackend {
  readonly name: string;
  init(): Promise<void>;
  logCommitment(commitment: AuditCommitment): Promise<string | null>;
  verifyCommitment(commitmentHash: string): Promise<boolean>;
  isConnected(): boolean;
}

interface ArchiveBackend {
  readonly name: string;
  init(): Promise<void>;
  archive(message: SecureMessage, commitment: AuditCommitment): Promise<string | null>;
  retrieve(archiveId: string): Promise<ArchivePayload | SecureMessage | null>;
  isConnected(): boolean;
}