thumb|160px|right|Leif Davidsen presenting På udkig efter Hemingway at the 2008 BogForum in Copenhagen Leif Davidsen (born 25 July 1950 in Otterup) is a Danish author and journalist. Career Educat
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 0x12d1cab27eabd744ee9bc7f0785010e67674a0c251337f2953c293e0d2c7010f. Chain 2 (Bitcoin): anchored in block 953886 (2026-06-16T04:37:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0be21bd0-b306-4b18-89c1-14d5ae81cf8b.json and https://artists.proofprofile.net/proofs/artist/0be21bd0-b306-4b18-89c1-14d5ae81cf8b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.