Cryptographic proof-of-existence for sustainability claims and compliance documentation. Multi-chain anchoring creates verifiable evidence trail for auditors and regulators.
Create tamper-evident records of regulatory filings and disclosure documents with immutable timestamps.
Anchor ESG reports and carbon claims with cryptographic proof for stakeholder assurance.
Reference on-chain anchors to verify document integrity and existence at point-in-time.
Upload document or provide data hash via API
SHA-256 fingerprint generated (content never stored)
Hash anchored to Polygon & Base with timestamp
Anyone can verify integrity against on-chain anchor
Create tamper-evident proof that specific disclosure was filed at specific time.
Anchor sustainability reports with cryptographic proof for stakeholder trust.
Provide auditors with verifiable evidence chain for compliance review.
# Create an attestation for a document curl -X POST "https://feedoracle.io/api/v1/dap/attest" \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{"hash": "sha256:a1b2c3...", "metadata": {"type": "esg_report"}}' # Response { "attestation_id": "dap_01abc...", "content_hash": "sha256:a1b2c3...", "anchors": { "polygon": "0x7d8e...9f0a", "base": "0x2b3c...4d5e" }, "timestamp": "2026-01-16T12:00:00Z", "verify_url": "https://feedoracle.io/verify/dap_01abc" }
Document content never stored – only cryptographic hash is anchored.
Privacy details →Anchored to Polygon and Base for resilience and independent verification.
Supported chains →Designed with reference to ISO/TC 307 blockchain standards concepts (not certified).
Standards alignment →