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lib/services/blockchain.types.ts

@@ -48,6 +48,37 @@ export interface BlockchainTransactionView {
   explorerUrl: string | null;
 }
 
+/**
+ * Cryptographic certificate for a registered contract.
+ * Contains metadata, blockchain proof, and a digital signature.
+ * Can be downloaded and verified by third parties.
+ */
+export interface CryptographicCertificate {
+  // Document metadata
+  contractId: string;
+  contractTitle: string | null;
+  contractFileName: string;
+  documentHash: string;
+
+  // Blockchain proof
+  txHash: string;
+  blockNumber: number;
+  blockTimestamp: string; // ISO string
+  network: string;
+  contractAddress: string;
+
+  // Certificate metadata
+  certificateId: string; // Unique certificate identifier
+  issuedAt: string; // ISO string - when the certificate was generated
+  issuer: string; // Ethereum address that issued the certificate (server wallet)
+
+  // Digital signature (ECDSA)
+  signature: string; // Signed message in hex format (0x...)
+
+  // Version for future compatibility
+  version: "1.0";
+}
+
 /**
  * Stats displayed at the top of the blockchain explorer page.
  */