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 0x6fdbfd50dc77195c4f29a2dc6d963ab609db967597b1719d26c2eb3c4854541b. 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/018b655a-28d3-41de-b51b-ea1480853faa.json and https://artists.proofprofile.net/proofs/artist/018b655a-28d3-41de-b51b-ea1480853faa.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 0xb004245e950b386fcfaa613439703d0ce137e4ea60de07d6749df923cfe34cd6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USCGJ1863480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8714b29ef145355af62bf803c857a2d95838d35cb55cc70a43ed2daf4aba3194. 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/USHM91869729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91bdc1626e97306128465d4d0499d89caa8d7db3445910dcaf3f030a241813b. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/USHM21997941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37acb3da8922c0a187561d676ce6e43b5660a58b4dba9302097c64337b0d6987. 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/USL4Q1901022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b07e205a18cc33d452401fe4d6ea6ca73aa8b88a016ebabeb4b6830a7c08b9. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USL4Q1967436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ea5259ee4dc68e4669f20a86cf6c7f7d08a8644f6d39e5ffe376f43edbd62c. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USHM92010306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100c923e52305ff9d1aa3bfdbae70862bb3850f0c71c32253036e7bc72611d0f. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USL4R1900853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b2eff0e3b4b22594e9e4298d58d4c28efc27a9525d6ad9a43648f5cf7b69b4. 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/USL4R2222794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79121e55fb7ad95b6adfc5087222847bef3e1724ffa33603848f74ca2307d58. 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/SE6XY2304120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787bfe6baaff83fe43130df389c24abd5bc352ced10fbceb988e63b3f9fb26c0. 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/SE6XY2321693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fa7c827bc09685503216eb8f865585c43bf1f8750fa1951ef5961ead1dca54. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/SE5BU2587335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cddb914fd3e2fa96566576727b2ef67f4cdb4acd75120d4f92c4841d8409b0. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SE5BU2587336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0db57b524caaf8c6bcb7fdc79cb4ecd8f24d76811b0657b659a87e38ed92722. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/SE5BU2587337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2ee6337686569c92d392c9cd5b72d37ebc137bf0bf75c1bdb2d7bb19139794. 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/USHM22110496.