thumb|260px|Aarhus Jazz Festival 2022 Foto Hreinn Gudlaugsson Uffe Eskild Markussen (born September 19, 1952, Frederikshavn) is a Danish jazz reedist, who plays primarily tenor saxophone and bass cl
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb965267410ba203781711441d36f13b35084aef56706bc5890dbc8a9c0b21764. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb8570fe-ace3-4ac8-8505-88f9be6c21cf.json and https://artists.proofprofile.net/proofs/artist/cb8570fe-ace3-4ac8-8505-88f9be6c21cf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Elvin Suite - Pt. 2 / Live At Danish Radio Concert Hall, Copenhagen / 2010
Charlie Watts Meets The Danish Radio Big Band (Live At Danish Radio Concert Hall, Copenhagen / 2010)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0c00e3b50e0dea38216b6580d58585e37a55db3905f25ddd1993c568a574a9. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71601921.