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 0xf975fd81c908a268129ec4ca2791e6ca20b6f0fe3fc0e0aa2418c3733796be2a. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f356a3c9-8ca5-4a44-b32c-97638f5ef1dc.json and https://artists.proofprofile.net/proofs/artist/f356a3c9-8ca5-4a44-b32c-97638f5ef1dc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Carmen (Sung in English), Act I: Corporal! Sir! (Zuniga, Don José)
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 0xcbd2f0598c0f1ce24567f803c0bbf2baeffea134428210191663c5ab08b09061. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0301107 — a six-check JSON result.
Carmen (Sung in English), Act I: Come and help! (Cigarette Girls, Zuniga, Soldiers)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c021bd04238eaf9bfb3929ebda07abac4178c4a91488f143af73b3637a60da. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBLWD0301118 — a six-check JSON result.
Carmen (Sung in English), Act I: Well, Carmencita. what do you have to say for yourself? (Zuniga, Carmen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd424b98eb924c0effed3db672846be52ec724aa500f47a1c3481b8e774de7a7e. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/GBLWD0301120 — a six-check JSON result.
Carmen (Sung in English), Act I: Careful, - it's the lieutenant! (Don José, Zuniga, Carmen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3472d380c9c1696ab39ae98400fa7c1e5665ee3071ca7b746409d4c96884d54b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0301123 — a six-check JSON result.
Carmen (Sung in English), Act II: Bravo, bravo! More! Keep dancing! (Zuniga, Frasquita, Mercédès, Carmen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1275fa7731a0304c44b10f144c516caee475f0f6bd2cddb6002a4eccb7b9f6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBLWD0301126 — a six-check JSON result.