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 0x1e9207e29663d55107e717c5d6612bf07d7490a222b0814bc6cd03be96c33673. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0da57bc9-d3dc-4967-8753-b70f8e9d07e6.json and https://artists.proofprofile.net/proofs/artist/0da57bc9-d3dc-4967-8753-b70f8e9d07e6.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 0x108c7526aa6daf2ca2680ecb9674cba7e1408c71be5479983119145976d9e0e4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZZ972363030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7c8cc8632a5ef39ebda65abd27a8036c42f3d55e010cad6939e4f4894079b6. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ972363031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d18fed8bfe3dbcdb1efe6c979cda77fd9e8006332893143726ee56fad8b211a. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZZ972363032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa68f121caf7c3bef4f79fdb9ea289628cd0f8ec677b9b256ba42bc968f21c1d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ972363033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2245315d06139b674c80aa99c021c4659db8e2412231347ca274dd28ea84fea. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZZ972363034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e76510809b2b2dc1c7e35681fefffdac9d9ca0613c4259d0e8f2d00e2ffcf99. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ972363035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3303da572c1f72d2f632ab63558974f6ae808bbb064ce43d653e6f7ba31b4dd. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZZ972363036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7660eacff60e99d75ab69a55b663ccf52189c75c676036af70c7f87aa62a5537. 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/QZZ972363037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf233008d4ea5e4ad1a9af589161a8c28ecdac1a54514cf1a2ad965e5269fa388. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ972357968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2856c4be1b1c2a96a3442eb65c1d8156b68bd5cb72225fc7578bef0450a838b9. 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/QZZ972357969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e2344ea0f8f1fcf7e14f26761e64c6a982af2f0d0251136fcd099fd64518f2. 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/QZZ972357970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69135e4794419dece77696bbf7990e087e3410cfa1cadd2b6a180fe6633c34e9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ972357972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9901525e83676f86c696e839c58ed33d0be314213184dab4b1219b2a913c182a. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZZ972357983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2922e24b922263117d095e98e0d5f1d4d50526dea045099ed206b444d7662e0. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZZ972358005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6193fe96aa534290c384a287367b6f8b37d02a8ac381cd836e20cd077e6bad46. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ972358006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b54a7ceec55e75c14d5da62d82051b5cb72d79c8eae8741e83879f112bbb8a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZZ972358007.