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 0x4c3f8bcca0537c23b595222291c707efbfa6cc995c03d0993743141ed344c0f8. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5acf3dca-37b3-4364-85f6-341eb5d90254.json and https://artists.proofprofile.net/proofs/artist/5acf3dca-37b3-4364-85f6-341eb5d90254.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Iolanta Op. 69 / 6. Scene And Aria Of Robert: "Ne toropis', zdes' tak temno" "Kto možet sravnit'sya" - Live
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 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 0x77c5f6c197e96534331e3cdc7edd0fc664a28233b4b700514a6cd865fb0bad67. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961231211 — a six-check JSON result.
Iolanta Op. 69 / 7. Scene And Duet Of Iolanta And Vaudémont: "Odnako gde že mï?" - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d5fa78bf810ebcb8fe9be847ac962806aa59d49c3d16555f717531fe829695. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961231213 — a six-check JSON result.
Iolanta Op. 69 / 9. Finale: "Gotfrid, ya vïručat' tebya yavilsya" - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b49f2cb829d6c5716acf9ada09d529428053a8b38b9dc6b8a011ca279b9623. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961231219 — a six-check JSON result.