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Each farm boundary polygon that passes satellite deforestation screening is individually anchored to the Hedera Hashgraph ledger, creating an immutable record of its geographic coordinates and compliance status at the moment of verification. You can retrieve this cryptographic evidence package at any time by supplying the polygon’s identifier. The resulting evidence bundle is suitable for inclusion in regulatory submissions, third-party audits, and due diligence documentation as tamper-proof evidence that the polygon’s deforestation-free status was independently verified and recorded on a public distributed ledger.

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Endpoint

GET /api/v1/enterprise/eudr/evidence/ledger/polygon/{polygonId}

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Path Parameters

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polygonId
string
required
The unique identifier of the farm boundary polygon whose cryptographic evidence you want to retrieve. This ID is returned when you ingest polygons via the Polygons API. Evidence is only available after the polygon’s verification job has completed, signalled by the polygon.verified webhook event.

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Response Fields

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entityId
string
The polygon identifier for which this evidence bundle was generated.
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entityType
string
The type of entity for which evidence was anchored. Will be POLYGON for this endpoint.
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hederaTransactionIds
array
An array of all Hedera consensus transaction IDs associated with this polygon across all anchoring operations. Each ID can be independently verified on the Hedera Mirror Node.
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merkleRootHash
string
The Merkle root hash anchored on the Hedera ledger at the time of the polygon anchoring event.
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stateProofs
array
An array of Hedera state proof objects for independent audit verification.
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consensusTimestamp
string
The primary Hedera consensus timestamp (ISO-8601) of the polygon anchoring event.

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Code Examples

import agribackup
from agribackup.rest import ApiException

configuration = agribackup.Configuration(host="https://live.agribackup.com/api/v1")
configuration.api_key['ApiKeyAuth'] = 'sk_live_YOUR_API_KEY'

with agribackup.ApiClient(configuration) as api_client:
    try:
        evidence_api = agribackup.EnterpriseEvidenceApi(api_client)

        polygon_id = "poly_z9y8x7w6v5u4"
        response = evidence_api.get_polygon_evidence(polygon_id=polygon_id)

        print("Entity ID:", response.entity_id)
        print("Merkle Root Hash:", response.merkle_root_hash)
        print("Consensus Timestamp:", response.consensus_timestamp)
        print("Transaction IDs:", response.hedera_transaction_ids)
        for proof in response.state_proofs:
            print(f"  Proof TX: {proof.hedera_transaction_id} | Op: {proof.operation_type}")

    except ApiException as e:
        print("Exception when calling EnterpriseEvidenceApi: %s\n" % e)

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

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

async function getPolygonEvidence() {
  try {
    const polygonId = 'poly_z9y8x7w6v5u4';
    const response = await client.evidence.getPolygonEvidence(polygonId);

    console.log('Entity ID:', response.entityId);
    console.log('Merkle Root Hash:', response.merkleRootHash);
    console.log('Consensus Timestamp:', response.consensusTimestamp);
    console.log('Transaction IDs:', response.hederaTransactionIds);
    response.stateProofs.forEach(proof => {
      console.log(`  Proof TX: ${proof.hederaTransactionId} | Op: ${proof.operationType}`);
    });
  } catch (error) {
    console.error('Error retrieving polygon evidence:', error.message);
  }
}

getPolygonEvidence();

curl --request GET \
  --url https://live.agribackup.com/api/v1/enterprise/eudr/evidence/ledger/polygon/poly_z9y8x7w6v5u4 \
  --header 'X-API-Key: sk_live_YOUR_API_KEY'

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Example Response

{
  "entityId": "poly_z9y8x7w6v5u4",
  "entityType": "POLYGON",
  "hederaTransactionIds": [
    "0.0.12345@1713583100.000000000"
  ],
  "merkleRootHash": "0x9876543210fedcba9876543210fedcba9876543210fedcba9876543210fedcba",
  "stateProofs": [
    {
      "hederaTransactionId": "0.0.12345@1713583100.000000000",
      "consensusTimestamp": "2026-07-13T14:55:02",
      "merkleProof": "{\"path\":[\"0x012345...\"],\"root\":\"0x987654...\"}",
      "operationType": "CREATED"
    }
  ],
  "consensusTimestamp": "2026-07-13T14:55:02Z"
}
Only polygons with a COMPLIANT status are eligible for inclusion in a batch that can proceed to DDS generation. HIGH_RISK polygon evidence is preserved on-ledger but will prevent the associated batch from advancing through the compliance pipeline.