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 0xfab0c35a9e9f77bda4e96a5dd3c32bd7b97167fa49d1406f2694d0d312eb0db1. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e902a38-72e3-4d13-9c2d-ac91e6fa06e9.json and https://artists.proofprofile.net/proofs/artist/6e902a38-72e3-4d13-9c2d-ac91e6fa06e9.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 0x0edee6f743403f9b1a6fa038f43f6c24b18da385cb3633158dce4672bff7cbab. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QMDA71399491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fc1a5974348425bcd90a7a532c5f0d89f9ee6328fbaa77af2b3b5754cb94d6. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QMDA71399492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a73465e49991e85b4f113c53995706fad9fb6c87292eaff6a85f7af0ff11245. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71399493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c9e79ec83666a1232062cce8f2b4ebeed6f117868fed4dd9415c2089397db2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QMDA71399494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf97d1bcc65603459a67ebfc480fdaf7cc521bc4cf8d7811f16277298a561be. 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/QMDA71399495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5924616c805a76e46ac79312b3ecfea7dc5d88f1171847b8e80a0a06d9cc51b2. 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/QMDA71399496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1ebc566c77d8a62bc5c07b12c4498f9e6529271258b39991260c38792d949e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71399497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c042f159743d2c1ed2fb8c5c792539ee28aeab5af36e1f26257e80c9874283. 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/QMDA71399498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b96d39fea831a2ae5d6b978917c98ef615c65efa4eb8f325d3c1199522ec2d2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71399499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1e2e019d438390870a9e387b13ed86ee717e847c18543e5119b6bdb2953aa9. 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/QMDA71399500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0861cb5206e32c777277e695dabb60c2b5c605b42dbae3a4485329e65af88d68. 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/USA561398777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bd9d9d7c1f70885573c2dabbddb3371cd2d1d5898ff5435fe9b46dc9ef056c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USA561398778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5052bfd4c076b6f9bf0065b39c644ecc2d7dacc5ca8f59103c4277e174da4cfd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561398779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded35f37ada9f3ae3ae2fcebd9a8315c32595f97a527a5d7dfadb0ac1f4d6b21. 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/USA561398780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37880dee54b4ce8bff26aa8e6afed1c4ae4bc71d69ff8de4c39a3fb21f768897. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USA561398781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cd97b4c781b7ab1465f84885d2e0c29d7cb317942a8c72b1db7759fbd0f1c2. 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/USA561398782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b93ca4eb2f36b01bf74f574d068042f93c2d3c57f43d738c432956c7151f083. 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/USA561398783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2ce80a8f8318d0190fd927369e6a1a60ae5a3e5e710c6f5188a0f920a1f056. 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/USA561398784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa60fd51ed31679d04ff126481737ee9e640f500b861261c21b2b930098a8602. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USA561398785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073f27f522a1ed5eac1ef37daffb9e342080adc67bb579a7938b19f5e5579114. 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/USA561398786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54de8cceb6a3638fe539b0324b6e380151671b9fc25befabf81ed82172961357. 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/USA561398787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdf07e5527458029d4c54d1eb3b29af69579795c7d1ecf1d4f72b969d8eb0c9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USCHR1301332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7521e25277cfd5a3a7c670b3b23114e7a35967002f19af76b8928ec6b3a1c7db. 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/USA561398789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7461c28c2bf011b32619dd787eb83b1d1b1c5ae9a971d15908f163c12bf6cb99. 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/USA561398790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5551ba6e28fe67d7e8bc01aa9942dd603359970b2971f6e62c0c0cf3bfb434d. 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/USA561398791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a04eace39edb54a9184eaf5c2fb640d2f9e6ccde15c6e513eee01e46679013c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USA561398792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacaaf095e6ad0ee8902c7c482d3331477c8ca7d16f24c07473d34ee52fbd4e87. 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/USA561398793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bf59561e74094e9ffd92f4cb498011a3adc4478bc6f50240f3ebe05fdc7da7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA561398795.