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 0x0ee6465f6616d05b10e5536f0ca70046e1999f2948ac8cdc98b11f9c33125fb8. Chain 2 (Bitcoin): anchored in block 954050 (2026-06-17T05:14:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42cdb981-9110-4748-8b01-af6ac09d47ac.json and https://artists.proofprofile.net/proofs/artist/42cdb981-9110-4748-8b01-af6ac09d47ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Il Trovatore, "Coro de zingaros": Il Trovatore, "Coro de zingaros"
Mozart: La Flauta Mágica, Weber: El Cazador Furtivo - Grandes Coros de Ópera
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 0x86704cbb575a3e97fb763b6ae55232531d3ff361aae1b2d769e451cd59f4ac5d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5300715330.
Aida, "Gloria all'egitto": Aida, "Gloria all'egitto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887b6817bde205d2ff13ee77fbf0256cee721e5498328da8b84594552c7721e9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5300715331.
El Principe Igor, "Danza Polovtsiana, No. 17": El Principe Igor, "Danza Polovtsiana, No. 17"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66174aa4a5f7de401fe37d9ad1f4915e5787f7a15b7398c9b0305d82f5d2bfb4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5300715333.
Nabucco, "Va pensiero": Nabucco, "Va pensiero"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646473027f446c76fd24709737aa00d0b161943e05b638faf20497be07904cea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5300715334.