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 0x83a32c8bf8f33b0812232eed4b18dcf36d61c0a3c959b2e0563f2814660018d3. 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/cb6e130c-5524-47e0-9d38-5be0893738d9.json and https://artists.proofprofile.net/proofs/artist/cb6e130c-5524-47e0-9d38-5be0893738d9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Artistote: "L’humanité est divisée en deux : Les maîtres et les esclaves" / Musique: Percussions
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 0x030f690e838df5e59756d129ea835d918e1cf9f49099ab9bb01aee760ba0a1e6. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QM4TW1732103 — a six-check JSON result.
Récit: 1505. Le roi Ferdinand le Catholique écrit une lettre à Nicolas de Ovando / Musique: Guitare (Romanesca)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a855ae48914dde772d287ea5ddf88d935c4bdf2de43c1db51439973ba30790d. 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/QM4TW1732108 — a six-check JSON result.
Récit: 1620. Les premiers esclaves africains arrivent dans les colonies anglaises.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7874764d0986070f1fa164e036465428a9b2af70b3222b5d63dbfda480683a. 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/QM4TW1732112 — a six-check JSON result.
Récit: 1657. Richard Ligon publie Histoire Vraie et exacte de l’Île de la Barbade à Londres / Musique: Percussions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a6f2a4bd779b1e3b4b899fdba407073a944f92a7388611aa78efef7b89be57. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM4TW1732115 — a six-check JSON result.
Récit: 1661. Les Châtiments des esclaves dans le « Code de l’Esclavage de la Barbade » / Musique: Tambours très lents
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04033f962f77b2a37c975f402b7e09a6264fe095ee1251c89a9163fad7280e26. 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/QM4TW1732118 — a six-check JSON result.
Récit: 1685. Le « Code Noir » promulgué par Louis XIV s’est imposé jusqu’à 1848 / Musique: Kora et Oud
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fc2d9c1b0a3f4f82c5c763f98a7e69411e05915a49e9079496c2a4b9259151. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QM4TW1732120 — a six-check JSON result.
Récit: 1748. Montesquieu « De l’esclavage des nègres » / Musique: Marimba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d214b54f3621d16a5f444b008257ee2b208f514e58e9dd5a092098f73f91ec8. 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/QM4TW1732123 — a six-check JSON result.
Récit: 1782. L’esclave Belinda demande au Congrès du Massachusetts une pension en guise de réparation après une vie de labeur / Musique: Oud
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aee07eed895f641ec8cebf0c3bb85f60883f8484e6db590ae897399fe892a27. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QM4TW1732127 — a six-check JSON result.
Récit: 1848. Décret sur abolition de l’esclavage / Musique: Kora et Valiha
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89910c5b2a7fbd754ed7a0774ea27b2526034bfbfd5f6563dd5322c607470f8b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QM4TW1732130 — a six-check JSON result.
Récit: 1963. Martin Luther-King « Pourquoi nous ne pouvons pas attendre » / Musique: Percussions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5bddb8d86ce392fc1c6523286035d4769674a47d0afd3d533dd5a467cb0cdb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW1732133 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf922ce61b11aa92c0b0d1cf07225c41be7d54cd9a3601af7a63358ea94d54d1. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CH4211800167 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862dfd2aa8a0fbec94f4c5426590e94fdcc310a82e3e3a4be8acac9e2c08709a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CH4211800169 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb1b084c2f222335b562bf55775d8570dc2cea4bf81f01606314f54eecde121. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CH4211800171 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac0d3de5dc7343ec6acbff74a663629075d6b0050fc960c1aabffe9d68180c9. 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/CH4211800174 — a six-check JSON result.
Improvisation (Double Flute) and Narration
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d9c5ba246fc1ca8c9b4f1babad6608cc46e05cc86977ac042aacdf1926c1fe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH4211800177 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf35e3fad955b050333a192481c758d879f688128c7b8bf509739e32d36c0b4a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/CH4211800179 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c6c838c225e9a73a0d08f1da1047ad897f82631c3847b73e374f01bfd1baee. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/CH4211800182 — a six-check JSON result.