Attestation-grade historical data verification with cryptographically attested point-in-time snapshots anchored on Polygon
"You can't retroactively establish verifiable data history — unless it was preserved when it happened."
The Regulatory Memory Layer transforms FeedOracle from a data feed into attestation infrastructure. Instead of answering "What is the current value?", it enables institutions to prove:
"What data was reported at a specific moment — and can you cryptographically verify it?"
| 1. Capture | Daily snapshots of all 14 API endpoints (carbon, macro, RWA context, etc.) |
| 2. Hash | SHA-256 hash of complete data state |
| 3. Anchor | Hash anchored on Polygon Mainnet with timestamp |
| 4. Verify | Anyone can independently verify hash against on-chain record |
GET /memory/ — Service info and available endpoints
GET /memory/latest — Most recent snapshot metadata
GET /memory/dates — List all available snapshot dates
GET /memory/snapshot/{date} — Snapshot summary for date
GET /memory/snapshot/{date}/full — Complete snapshot data
GET /memory/snapshot/{date}/{endpoint} — Specific endpoint data with proof
GET /memory/proof/{date} — Cryptographic proof with on-chain anchor
GET /memory/verify/{hash} — Verify if hash exists in any snapshot
GET https://feedoracle.io/memory/proof/2026-01-14
{
"date": "2026-01-14",
"proof": {
"captured_at": "2026-01-14T08:31:37Z",
"data_hash": "b3b0e2e09cd97797...",
"full_hash": "f9bb146e697c6222...",
"endpoint_count": 14,
"success_count": 14
},
"anchor": {
"tx_hash": "55e7ad88bd06241f...",
"polygonscan": "https://polygonscan.com/tx/0x55e7ad88..."
},
"verification_statement": "FeedOracle attests that this data state existed on 2026-01-14",
"disclaimer": "This proves what was reported, not data accuracy or compliance."
}
| Use Case | Description |
|---|---|
| Audit Facilitation | Prove what data informed a regulatory filing at the time it was made |
| DAO Governance | Verify the exact data state that was visible when a vote occurred |
| Dispute Documentation | Establish what was known at the time of a transaction |
| Cross-Border Compliance | Provide single verifiable record to multiple jurisdictions |
| Due Diligence | Demonstrate reliance on contemporaneous data for investment decisions |
| ✓ Data Delivery | What FeedOracle reported at a specific timestamp |
| ✓ Temporal Existence | That this data state existed at the claimed time |
| ✓ Integrity | Data has not been modified since capture (hash verification) |
| ✓ Non-Repudiation | Neither party can deny the historical record |
| ✗ Data Accuracy | We prove delivery, not that underlying data was correct |
| ✗ Compliance | Users remain responsible for regulatory compliance decisions |
| ✗ Legal Evidence | Admissibility depends on jurisdiction; consult legal counsel |
| ✗ Data Validation | Source data quality is outside our scope |
| ✗ Recommendations | We do not advise on how to interpret or use the data |
| Date | 2026-01-14 |
| Endpoints | 14/14 captured |
| Data Hash | b3b0e2e09cd97797c9193e3b5e5e10d7e76d761d... |
| TX Hash | 0x55e7ad88bd06241f5ca61c688a5fd3437af8e33d... |
| Chain | Polygon Mainnet |
| Verify | View on Polygonscan → |
Snapshots are captured daily at 00:05 UTC. Each snapshot includes all active API endpoints.
SHA-256 over JSON-serialized data (sorted keys, minimal separators) for deterministic hashing.
Polygon Mainnet — selected for low fees, fast finality, and EVM compatibility.
All snapshots retained indefinitely. On-chain anchors are permanent.