250px|thumb|December 25: The Duke of Milan, Galeazzo Sforza, is assassinated during a church service. 250px|thumb|March 2: The Battle of Grandson is fought in Switzerland. Year 1476 (MCDLXXVI) was a
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6e67495b478a834525d69dcebc8061b9d0f0c747da57d9748115b3727224cc. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c840e01-f3f5-4695-b09c-e1853a7c8e01.json and https://artists.proofprofile.net/proofs/artist/2c840e01-f3f5-4695-b09c-e1853a7c8e01.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Edgar Allan Poe: A Life of Hope & Despair