Cryptographic Evidence: Hedera Proofs and HMAC Signatures

import { AgriBackupClient } from '@agribackup/sdk';

const client = new AgriBackupClient({
  apiKey: 'sk_live_YOUR_API_KEY',
  baseUrl: 'https://live.agribackup.com/api/v1'
});

async function retrieveEvidence() {
  try {
    // Retrieve batch evidence
    const batchEvidence = await client.evidence.getBatchLedgerEvidence('uuid-batch-1234');
    console.log('Hedera TX IDs:', batchEvidence.hederaTransactionIds);
    console.log('Merkle root:', batchEvidence.merkleRootHash);
    console.log('Consensus timestamp:', batchEvidence.consensusTimestamp);

    // Retrieve polygon evidence
    const polyEvidence = await client.evidence.getPolygonLedgerEvidence('uuid-poly-5678');
    for (const proof of polyEvidence.stateProofs) {
      console.log(`  ${proof.operationType} at ${proof.consensusTimestamp}`);
      console.log(`  TX: ${proof.hederaTransactionId}`);
    }

    // Retrieve shipment evidence
    const shipmentEvidence = await client.evidence.getShipmentLedgerEvidence('BOL-99281744');
    console.log('Shipment evidence entity:', shipmentEvidence.entityId);

  } catch (error) {
    console.error('Error:', error.message);
  }
}

import com.agribackup.client.*;
import com.agribackup.client.api.*;
import com.agribackup.client.model.*;

public class EvidenceRetrieval {
    public static void main(String[] args) {
        ApiClient defaultClient = Configuration.getDefaultApiClient();
        defaultClient.setBasePath("https://live.agribackup.com/api/v1");
        defaultClient.setApiKey("sk_live_YOUR_API_KEY");

        EnterpriseEvidenceApi evidenceApi = new EnterpriseEvidenceApi(defaultClient);

        try {
            // Retrieve batch evidence
            LedgerEvidenceResponse batchEvidence =
                evidenceApi.getBatchLedgerEvidence("uuid-batch-1234");
            System.out.println("Hedera TX IDs: " + batchEvidence.getHederaTransactionIds());
            System.out.println("Merkle root: " + batchEvidence.getMerkleRootHash());

            // Retrieve polygon evidence
            LedgerEvidenceResponse polyEvidence =
                evidenceApi.getPolygonLedgerEvidence("uuid-poly-5678");
            for (HederaStateProof proof : polyEvidence.getStateProofs()) {
                System.out.println("  " + proof.getOperationType()
                    + " at " + proof.getConsensusTimestamp());
                System.out.println("  TX: " + proof.getHederaTransactionId());
            }

            // Retrieve shipment evidence
            LedgerEvidenceResponse shipmentEvidence =
                evidenceApi.getShipmentLedgerEvidence("BOL-99281744");
            System.out.println("Shipment entity: " + shipmentEvidence.getEntityId());

        } catch (ApiException e) {
            System.err.println("Exception: " + e.getResponseBody());
        }
    }
}