Nikolay Atanasov-Joko (; born 11 December 1974 in Sofia), also spelled Nikolai Atanasov, is a Bulgarian long jumper. His personal best jump is 8.31 metres, achieved in July 2003 in Pirgos. He compete
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 0xa3750a9618ded4a156e1adb51d7f6075bf63e6b2d245aaab0a164a3d9da6657d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0679f70-da19-498e-924a-75f22290134b.json and https://artists.proofprofile.net/proofs/artist/e0679f70-da19-498e-924a-75f22290134b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.