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 0x3865256795fbedc458542cc9f6b4f99b1cd62ffc7087e7384a95e59abe7f1a13. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e92bab03-3595-4c55-999a-676c813e06ce.json and https://artists.proofprofile.net/proofs/artist/e92bab03-3595-4c55-999a-676c813e06ce.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 0xddd86f65dedc6ce996e6e6fcee49f830b20f33e25ea28a628ed6db24f8c4c50b. 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/QZTAS2108682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38014f59660b82aadabb01b4eea0c1f6c66eaa8ef55000a43b5d713c3afe01ff. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZK6F2327645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21af59021208f106187d272b4e946641a684b74401f5cc226d2e6e52baf130f. 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/QZTB52306678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd698d97c9a264cadab00ab898fa168ebfd72effcec80b9d5fe8da30ffe4db18. 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/QZK6P2522475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bb340f64ad19f324a5dc5382a11dbca9b2edb30ad77443c7ec33d0d614b184. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6P2522477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed7035d8782342e3fa144bb81316cffe05e5963c91989b23ea773a6348004b8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6P2522478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b2579bd7813f4883e7d4196e3f858d8633ea530a452cf7036b1a709ff9f036. 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/QZK6P2522479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34274503891c3ab5e0497196570a5b59944098af17a0fb072967e716e565ccf9. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6P2522480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2292850b5753caac81defa0dadd10de7c1bb6b8f2ac87f45364434a1fd49e334. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZK6P2522482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4c7a58aac2f6d49ac3a046612c70807e6a20200cd3a7af90409c8465127b23. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWX2594634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36aa1798f0e417445e61234704a4552092f39f891765876add2e3ffd35192ca. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZNWX2594635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80719aa53360cd90dcd980cad672dbe917dc960dca987f9df7baa35ab4b2c2f7. 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/QZNWX2594637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad03ddb9da0ee6a05c190d24a7ff8d8f34c6579e9aa487ad00d346323f8c76a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNWX2594638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7061b70dbc813afdea3cb182acdb7a14c34dd4bf30970722fa900102093218c7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNWX2594639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd972bd276ace6dd3252dd9ed0670cbd2e2e0c73527e902e2c100f58d15ed89be. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNWX2594640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f2a6c3378971f2d5a7245fc510120e155a04ae9c3c44a7235e34db78603aab. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWX2594641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fdfdd1b66e008f23405ca76dec9f7f762a638212d3eb5b65c7e25d304d73d8. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZNWX2594642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c904197e3f611cd639db74efefbdee78dfbcd7a243a67296c8b52c4e1460ff. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZNWX2594645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cdcf22572f77da47be6da9d85b65f81a85c9d93fbaa13be5332a363e6359ed. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ7L2560272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47ccb795bc2dbee7815ee911d6684b676165b8c0a0297ca804c20b7d7e17ade. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7L2560274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4a8cb226b39fb8df13f16b83c16f0c63efdf7e5b4230081b65a1e54afbd47. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3F62598472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8805cadd4f69fea15c85004e182cfdc002fee7df545df49feec1640d1d6277d8. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QT3FD2517249.