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 0x83f763e3667b5383aa20b720708d16592639d1b7e24e0324b3ac164db5978090. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21ee811a-025d-482e-a998-57ffa9314516.json and https://artists.proofprofile.net/proofs/artist/21ee811a-025d-482e-a998-57ffa9314516.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x9c9a56357b95f74f1ea82da1dabae38ca97d9945d5c25fd1a1370c9297e1b2c0. 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/NO2DY2300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfa1de6ea6153c79bd66ee102711563393d4b34afd181cc37b4e3866306fca5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NO2DY2300067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea2fa578344f3bd270995ff38a0456159ac0239109bdb80c0de09de1b466f6f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NO2DY2300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0784c3185a5c4c085732826a5727708333af00c9d0c21fb65ca80321b0eb2da0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NO2DY2200335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7627eccf677e805c24a4c3b892098092dfc002f85d9b9e47a58596eee51d5b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NO2DY2300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a99ea446114391d4ef82529888219fc274fa63afb85d92b5e9166b7a8aee6c1. 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/NO2DY2300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc71c7b76c5d48cad1f080b9205e11905621309fa765838c52cc8cfd8cb32cd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOPGM1700401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdda29cadfa8781ecb880674941a0899723d32ae98c56b80ad47898cf78fed5e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOPGM1700403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bb59c91b009007308dac3ef1ebb614a6bb0a4ef26c51793d17cf399d5c8add. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOPGM1700404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd330606bdd3a035bcd133c9b579b767d91d481bb8264002f36aaef7abd3d1ab. 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/NOPGM1700406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8588cf066331d319b24bccdafeb68bb4518223c33e345818b1f17f250e1b636. 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/NOPGM1700408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa80389b442f6ff311c2c4bd1b577640526776013221ee422bb2187f9563501. 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/NOPGM1700409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0653aebde837bca0fb13bca62cbb21d7a8cc626cb962e754183eda4f4ad4bee. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOCTN1427010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36dcdea06496a9cb4a5481d3a25574f8bfef89aaab771dda500a44798b8b941. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOCTN1427020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde740f19995e19931dcc3fbe8772259bbd647ea354482629fa18fb050da6ee84. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOCTN1427030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f8b6a7f0491095cb066c57b91081c539dd5eb3d138215cc5daf86f8aaa3974. 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/NOCTN1427040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c3a99fb7d76947758713c225a434e6e3a120fa199c8b30ee9d970f5a6cb680. 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/NOCTN1427050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd915ed50493497ccd2904e9b1f02ce7e8f6b0e2ad1d3c739c8bae0ee537835c6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOCTN1427070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7627eccf677e805c24a4c3b892098092dfc002f85d9b9e47a58596eee51d5b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NO2DY2300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0784c3185a5c4c085732826a5727708333af00c9d0c21fb65ca80321b0eb2da0. 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/NO2DY2200335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e63513bab9c0061a3b99c71a11cd959a21c4e038fdad44215fd0ebabd983b7. 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/NOPGM1800401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec759a594305c7f646f0c766f6c58328fd2d735a46ddd55c063f2c6e3ab98938. 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/NOQNI1603020.