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 0x9dce952d28f3112b41e0c131edae2d7622fd399aeaabece9751c8ec49a9b693a. 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/471ce100-f0d6-468e-aec3-fbb14d884267.json and https://artists.proofprofile.net/proofs/artist/471ce100-f0d6-468e-aec3-fbb14d884267.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 0xbdf2bfbbcdb77b2112384aa587223ee1655d1edc2f8c0b686e905931825f1824. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TW2544824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65694b365f4595d37568fafb53c16b8828cf1f8dd611bb58feac060ab010941. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QMDA62530298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33655aaed20587e995331d8bf7bb09fc75383bb2be1c12669a6536d01fa16737. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/RUA1D2167589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510ec975fd4ec63784d713e4d8c3b2104239e80a35a8b74a83e56d7d7020a271. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW2318100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc965ddf51f1a6e71edec568c367531197888ab6363ab2d4b9b415b4cdea2eaf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW2281569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94210f2b1bb8d2f271364336106599e213169a41243c85e62464249f0853627. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ92408588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d9760fdf8158d6c7d8811ee5595d346e9aeffc400ef68a5bb34d61feb604a4. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM4TW2544735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e5accc98028ecf2231ad15d405953268c4bbb0c0ebc856cb0ee88ce16b1fcf. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QMBZ92272656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35c3948ddaa9b886f15a6dd290b1f22868319a989e4aedcdf35f718e3c64b43. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/RUA1D2171632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943c54e4b61d37d233fef431616bcf0350e610947730cbb254dfd88ee81ee778. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QMBZ92272635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c115749a947b99a463421784a39f20908ca4a8dc6be31a120df553d4c8e681. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QM4TW2559898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb493e32cb6b9120c43caa46cd4e770e690a234c9ab7150135b98f6081f6fd17. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMFME2476424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401d8a2d8232b7cb4ce58e1da625bbf212199afa1763ca404fea517b1ae8fa4f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM4TW2544705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fa0de3a2650e4a798a418b53c6f18180cd186cc8053b6b4b97d17c331ccf23. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QMFME2581649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d69d1a65b463f0aa8a46a5fd5dd06d43a7abd43cf841e92a8d890594bd62b56. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMDA62530246.