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 0x35345a33c6c2b97585fdedf57451263419e91a8ace8760a27ca3e286af4e5566. 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/f2c2a08b-8885-4bb9-aaa0-00ac084b2beb.json and https://artists.proofprofile.net/proofs/artist/f2c2a08b-8885-4bb9-aaa0-00ac084b2beb.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 0xa87a633b61f1ebc10d021cd5c055e6cb739fced51deea290adbb7cbc5028b0f7. 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/BRDEP0200294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b35daf0a2f648b72e8ddb61a71fd6c6efaa06494a3d11a56de7e7bb8c3f7446. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:05:06Z), 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/BRDEP0200298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae71bce0dfcd0cbe79b0f3d8666002766ed9072db1bfd22bfb1e3f4d3288861. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:52:15Z), 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/QZ5AB1843390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5a8c532c71f77c916469ec434407458345c12b0b1eef433435ef52c69b3ee9. 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/QZ5AB1843391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5a4b81ed4ec579df7e466801111f7233aefd59bebad4a20368c561b8b2528b. 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/QZ5AB1843395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efbafa81ffb33b3fdcc336ef71fc0243578b304d9366e45157f9fe21c3f5337. 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/QZ5AB1843397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb26244ab6eb91319af46652c46d4227a3a70738ab20cf20c844c30fe7f32c0. 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/QZ5AB1843398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5cb7b84221daa1426c9716fa575ea268a029c3711f9584e855c1d08065d71d. 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/QZ5AB1843401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbda43224771836f2900c674b3d1a29080a4ed481c56afd250387530f6b613c. 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/US7VG1102426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2369ae0052244e2c3e28cacefc106d3d761af6ace4f70a4bf0a6721b5df9be6e. 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/US7VG1102431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d81837faffef3ee964136928d05d8f07fa481803a82392c187c9bcc48fc50e. 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/US7VG1102486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d29e5df438f90d08ea223a0f98833172daaf24cfdbb3f526d13ea87f527c9ed. 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/US7VG1102490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de217415d0d65e65e07c19a4171c30b93c7fd8bf7a9fccfe2289ba78b9dec91. 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/US7VG1102475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822287271d6537adb9beea6a669a7add700e45d72394dff21ad0620f88b54068. 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/US7VG1102348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149ecc90ce0c7a4c93eead1ce3233a599e4a841993c1e48b6ae5a7890e216aed. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:32:26Z), 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/US7VG1102349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591ca42f12b8eeaa258711cf6e323b5cba40d23e693e4bdbfdad9b1fd4b3142e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US7VG1102351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b59664c5a687e68add04f96cc27ac21e1f7309fdba9e330e3fb5b245269e05c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:53:02Z), 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/US7VG1102353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f89fb8cdeb313f8aa6b392d8c15e4cc6d61f3aa5e7eb08ce1081be063ec9ea. 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/US7VG1102358.