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 0x90ddb6ac5157f9f3d93357ec94885a2b6e29f661fb49294f697042d20ff19536. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfccf0ff-85bf-4c12-bc5b-a681dc89deb6.json and https://artists.proofprofile.net/proofs/artist/cfccf0ff-85bf-4c12-bc5b-a681dc89deb6.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 0xd734ad0574a51733fa2f8e3a24da8a165186b7c89c2cbb4ab9013031b67edc8c. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T23:00:00Z), 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/QMEU31915667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d3c6286066d284d1f75a74c364c3b10f0098cf10c2537fd0d8bb6d5fbdb104. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QMEU31915668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9999f75bc9e69b5583831e741cc9622f888304bfdc4b5d57aebbca5a9ff286. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMEU31915669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8ac338f09f2d14daeece7ec882e1941f14c3ff9ea7ded068047eaf1ee04263. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T15:35:58Z), 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/QMEU31915670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f017db386e19299ebc23f57cff4a396ea2c5154cc0756b1475067676c7ce9c9. 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/QMEU32314544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb95f5f6f710195ac57d599be45eb29f003c90208ed1b28adbc0daf44eabd1b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QMEU32314545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604c8574944ff3867d6f8f76a4012087f27beb79dc025819c8e9d854f3cdb9ab. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:35:19Z), 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/QMEU32314546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192e76f5c271d2440f4cac0877c1889ebafec40d028c941d4ff03c6c5e13e159. 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/QMEU32314547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7fac9773650492ea3c2a80a625d2ce288013c56d1f7861e174e8b82f185cce. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:31:27Z), 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/QMEU32314549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3710c1918b4feca595982e322e3cbf6f0d2f27a1efe767b5ac2d410f9c55a247. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QMEU32314550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2a0ac661150c27ef075faa36549f869c8579ea08d8f28937bb93a2f9dfc0bd. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:09:06Z), 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/QMEU32314552.