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 0x91041c456426b196c1655116b263a674c0cfae97ea96e8b83c05584b6b0ca92e. 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/80823c3e-5c20-46a4-a16f-de92266244b1.json and https://artists.proofprofile.net/proofs/artist/80823c3e-5c20-46a4-a16f-de92266244b1.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 0x4cd09902a931009566b30232ecd6362623cc2c2bc754cbae527e086cb3f832d5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLE801700492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405cbdf42188f2eb62ceb71e2346f92ec9ae4aa44dc9ed29e3b4baab57bb6d8f. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/NLH2L1800043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c81f7c6cb58ef1d583ee3f57f8445cd18c86eb6a244a9a3bd4710a817988e3. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NLH2L1800253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2434fa9e648a306dfea0fcc40bfee263f64df00aa5a6e3e26c982a44170d6d1b. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/NLS762000110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5289ad56a135c10337c950b3d824196d11f029fdca4ff874506d6cc5bcaddba4. 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/NLS762000219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cda485e7372294857bd5e658eccfa92b65173ba2b0fc5cc16f97e50747f467d. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/NLS762000239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a24cdafbaa45947fe6e596476da2700e93519246e41ae4f37cc0124e7324fb7. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/NLS762000393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4d0e739ecce39ee86f624cca4afc95f8052f67169fb384773a2cd6c9b12d76. 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/NLS762100085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f775f9b330dccd2aeba899b7f2e7d6fac29d78e2c6378b9724ae7659af3676. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/NLS762200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4df2ee7d4d0fae6242f71a497eec81f3fb0d101eb6d1129d581f954ceff967. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLS762100545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19971c5209a0582fa60cc4dc4700705f3580c864943aabfb69c210f1c3ef9715. 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/NLS762200244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b446926c278f00decc4442b7f84bdcb6d4d96e66fa980e0e72d9ecb7bbcbfb. 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/NLS762200269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e2adc02bd629eb433404fc92781abd58aadb17cfe9fc40822fe0c24bbb864a. 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/NLS762300177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf8b764723fcba3cb14e9b8fd9c5ce3c456052ac377f64cbcfe43456a46f26e. 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/NLS762300811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e2c13794a42f401df048161351985eb28ed4aa3e051aa4d3f53b41881ab669. 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/NLH3Q1900491.