thumb|right|220px|Gonzalo Roig Gonzalo Roig Lobo (Havana, 20 July 1890 – Havana, 13 June 1970) was a Cuban composer, pianist, violinist and musical director. He was a pioneer of the symphonic movement
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 0xb90e40f875e75d16f69a4b7f61f8db9baf25cb4c08e520fde47ff0c3ead08c2a. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bfec4fee-1ebc-4237-8a28-2fab9046119b.json and https://artists.proofprofile.net/proofs/artist/bfec4fee-1ebc-4237-8a28-2fab9046119b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Roig, G.: Cecilia Valdes [Zarzuela] (Perez, Naya, Roig) (1950)
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 0x9ecd635c7dca4f25ecef6ed96383a6476837bb1751244097fffba6a4edaf34b9. 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/NLA508324009.
Sailors, Soldiers & Airmen of Her Majesty's Forces
We'll Meet Again - Songs For V.E. Day Heroes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214067920579ed33cedcde5a1be6046ff8ef3861e0629f07e6f05bdf752d0a43. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBF075220930.
We'll Meet Again, The Very Best Of Vera Lynn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214067920579ed33cedcde5a1be6046ff8ef3861e0629f07e6f05bdf752d0a43. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBF075220930.
Agustin Rodriguez – arr. Mario Ruiz Armengol
The Golden Age of Light Music: Melodies for Romantics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4062d34ce897f4377a6da5de7431f79a11457dbd7e161cafb84be5a3fea69a1a. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/CH6630955517.
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