thumb|Sten Nadolny at the Frankfurt Book Fair 2017 Sten Nadolny (; born 29 July 1942, in Zehdenick, Province of Brandenburg) is a German novelist. His parents, Burkhard and Isabella Nadolny, were also
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 0x8c80c866ff5e74b5c7abcac16346a45f11e7cf56d9341af43690ac533aa018e7. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4f32013-4d04-4f60-97cb-c2583e98c0c4.json and https://artists.proofprofile.net/proofs/artist/a4f32013-4d04-4f60-97cb-c2583e98c0c4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.