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 0x9c3cff62ae02e77c63c0955886f58028ce84198c2d84210256ce2e343534d9c6. 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/5c8eb280-db42-4d6f-85f9-eb2d53c723d4.json and https://artists.proofprofile.net/proofs/artist/5c8eb280-db42-4d6f-85f9-eb2d53c723d4.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 0x2fa64f3364dff29653f88628f1e4729138eb480c0ddfb4a93c384284dafd2353. 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/QZES82304708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7756ac8ab29b80f3789f8ddb6ea36f375388c2a2203e12c0a062372e2029a369. 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/QZDA62341965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf77bf33789aba73e1f0b8efd3aee48c4a38d1741eaa7dfc126d1e4fea83441e. 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/QZFZ22405068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e27cc63cfd1ae90eb03e284534a6ef666a2b3d1c8961bc164fc2bd2c648813. 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/QMDA62324181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c54b04bf003ad301f2d77bf586d0c7793fa8918e065eb383cdb7856eb63e7df. 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/QZHN72338538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd673b9173ef4d867e699f1d53b9c08961929c03972d15e87dcd112764de65955. 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/ES75E2204735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d69ab1a598fddaad78b22a4339adc6824485efe3cbbe310009de7854bd099d. 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/QZK6L2354393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf149316e94bf3f47ea14ddb9f5bdf2a94a2fa433eb66d2cd3c40e5ce75b3d20. 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/QZTAU2318510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a8cfe826e6299fb9023ac72c8bdd278fdff8dbd05f4ac1e74293273141418c. 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/QM6P42478519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e69e64279b97ad048908d08fea3c31019aed2bab43063a2c3cf2b56a16b173. 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/QM6P42478529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b664a2dcf10d21da6d60da170fb6be7f2394646e6eb27ed4e345e4eb186004. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QM6P42478535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77dc4f847b2fc7855a6673f88257157eb4de481e281213ccaf02049050ae8909. 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/QM6P42478543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2dd9c7fa8821acb284e506b5bb1dd893560aa2ee7b26e83fadbacb6d59b739. 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/QM6P42478548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1f8949f6946d08f6dee23c889d8a57a1a9e2d821826ef63311fad235104682. 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/ES64E2204153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda768bbf183e2a4c6ca858faac0de36a41a271442b9f68e9fea768884baa6ed8. 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/QM4TW2576746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde226484357f7951d4fbb345b3d7f9ad51d8637b8fe251e188eb0b271b66498. 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/QM4TW2576763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c6415c0c14e301c03ccfba63fd35cf4695d764ef548954e5806cbdbd99ce86. 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/QM4TW2576771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13549ce146398fda2170855b1a866e3f1d77676c682cad75f507319a727fb618. 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/QZWFU2461753.