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 0x2f63118d8510097edebc34bacb7ead7be593249d1d4bd58a61c3933e060985ed. 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/bc4634b1-152f-4976-9cc8-a1eebb0231a9.json and https://artists.proofprofile.net/proofs/artist/bc4634b1-152f-4976-9cc8-a1eebb0231a9.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 0x7b0785576ca31cdce70a4ba7230005f5b0dfe440ac43e68feb93e9c30aee3eac. 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/DGA0M2322431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42899cac21a4a24c959e6d65d814b610f5bc36db727ff89d952ba5a2e635e63. 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/DGA072304397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1644dff4e55fe7b705d56368751484d37fd9e40df25b1beffb6141937a6425. 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/QZTPX2214573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42899cac21a4a24c959e6d65d814b610f5bc36db727ff89d952ba5a2e635e63. 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/DGA072304397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0785576ca31cdce70a4ba7230005f5b0dfe440ac43e68feb93e9c30aee3eac. 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/DGA0M2322431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8550b060af8eebcbfdc9d1f963f5eae897fef999a713d5c82846d9eb55ff612a. 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/FRX452490330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3af298789ee03ff2ed8f6f42391569c780814c2e4286fe7c01fc5589e3b4a20. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FRX452490332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c5ba6863474e375c2dcd090a5342c8f0bae6e49ca409aa0ea1afb340924cb9. 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/FRX452490334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789568e8d5cc5c78d208adc6f0170ab28f7b45dd65f84e93730edaa295a9ba37. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJV2521465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4eb6cfe093bc8b41f367e32ef5ed2b1e37f90b7c695bb0c05b5db8802a558c1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBRKQ2589202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d4079dd1100c82191c5e4d36e1c7938ffd57e447973e2b3739e3e5416338ab. 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/FR10S2574851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a26d6b39f15287039be0d233f5ac07859cba458499c20b74e70d492850777b8. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:47:04Z), 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/QZWV32494890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee435a3970c0896a1ab9c8759626d84a070f35b3b2bd4de7a3c0d351082b2253. 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/GXBAV2297535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22816a9c489566250259e91baa05c26c17fea09a3f25b0d7c803a7e4796cc71e. 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/DGA072335807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ae2732fcc84a609fabc341ab57b310d03ba8f79c273368c76491038f690859. 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/QZNJV2029662.