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 0x12299310300af18af502fadb227ac2f3b0c300294291c6de093d86490f6951e6. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76d2b709-f9ab-4d3a-9b72-35d2a4f47da6.json and https://artists.proofprofile.net/proofs/artist/76d2b709-f9ab-4d3a-9b72-35d2a4f47da6.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 0x9f720e942b2e6fb591d5898196324a4fa73f0dd60e607fe31b3acaad750a4e1f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZWFF2395383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ac950d5d1fd3f5179f2b8a82ea5e1b9ef02dc5c0b2680a73cae1fa38c1028d. 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/QZPEW2407989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f28b0998ab9eadcdc21b17699efa001e1ff4eea9c328a6a7d54f54b3bbb3fd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZPEW2447431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c020650d3ddfd67933e10f63a610c83b6a78f8fe34e71a798507954f86e350. 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/QT2VB2453312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc390741490c20c283914b0fee6942cc348ab0b3d3b2772ab29df9025c2b32f9d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZVEM1833598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0be42d8e6d671bc716a448031bade4b056d4271b6dc11963c64df773a9e6e1. 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/QZVEM1860719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc390741490c20c283914b0fee6942cc348ab0b3d3b2772ab29df9025c2b32f9d. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZVEM1833598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefc87514816ff8fbabd05e6d32d372b9024d869b2b91be1e245d613afcec125. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZVEM1860720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefd7df7f32a63df584f250a7137847b0f03933da6ea15b6202157d0528ebdd4. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TLVEM2483827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f6d0ddb8199cefcafb9ddfdc925fc0a2014103c159f07f54c778252bc70964. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZPEW2447500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9747d7d7149a9a0f87cc405a09d2c7e205613cdef4dd206bb27dce24b976561c. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZVEM1860724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ad108bb95d59ee9d66543d21eb1ee2ea0ff6a94a7dba71838164e953cb0a22. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFQ2371880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc477a44ebf29ac3f7b24033cc3e68aa3f7f340e522be1129d339f12f5424362b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZPEW2401493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c020650d3ddfd67933e10f63a610c83b6a78f8fe34e71a798507954f86e350. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QT2VB2453312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1570d2040ed9b5ba848fec3afe5d898253a142f6814e874acf338c7f313c638c. 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/QT2VB2506635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0be42d8e6d671bc716a448031bade4b056d4271b6dc11963c64df773a9e6e1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZVEM1860719.