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 0x46d554fdf7d5216f0ab49cd3388b1a479725ee253b56ddbe9ebfe317b5a09ae9. 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/7141bbb0-087b-48c7-a160-4f3a7ce1b73f.json and https://artists.proofprofile.net/proofs/artist/7141bbb0-087b-48c7-a160-4f3a7ce1b73f.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 0x3b18a4489e0e0c9bdbb990ebebcf1a64ff22e0853e158fe00b70102427063c0c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/US6YF2100081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e555a07f49547529ef33aa137b003921ed9eecae4dfded8378844cfcbbcfacf. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US6YF2100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6961a349db12bb679a111775b40c095f455fa08f1cb9fab5a88dfaf45560ccc. 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/US6YF2100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f383c873c7a5b0402f56923e68bd9782c669a8cc9820725a3dea99a17a0a404. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US6YF2100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd156a927ce86f615f4057e2184c04eb3d0b769e9d66bfa4a292eb0414f1210a5. 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/US6YF2100083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9600feebc9d0764a8411d8d67c448861c32d9b76fa5b09911fe76608d6fe0d1. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/US6YF2100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e749aa1ed03e19752e25faa7a51dba0bf829008d6d58834e9812c99dfe0dc0. 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/US6YF2100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06603b50b8ceb15f8b908860b6d5f974b308fdda5fa400550f9b326d6968a409. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US6YF2100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f32cbb51c3d823913fa8a24788d0187afefc7548b923b181f487067aabc97f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US6YF2100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6539bfc92d54ee55bd7b64bb91b93f1af07d5e3fd4edbef183eb3ef1701c3c4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US6YF2100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440435744db5d4948eb2345fff7fbe20cc1866e8d706699a036cee869aa4edb8. 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/US6YF2100059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4ef0c308869da9d5017ca8e01f4a59d9de53ced0d02202f93ea0e475742a9a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US6YF2100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f9dc82d6b3aa4da5fe6ce264e20a60e085b0471178726a61ac44a02809dd23. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/US6YF2100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd949723cf77dd61f0fecb9ef1089e56d2505ebc3b861a5943b1d9b9f01a10935. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/US6YF2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a011478787fdc58aff4ad1251a84466ade8139e34adcfddd5c86126a7184bf. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/US6YF2200134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccacd3cc483663dab075fecf370222633e63b488b7b4bd60db8df25f4b8b0fb. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/US6YF2200145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa73e8e98af4416143d72cc897a5768b71a6824d29fe968643eb344a660ae05e. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/US6YF2200192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762d44285d9632d316cf6ee9676c012d6f0870e485448cf062a912bec0359129. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/US6YF2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fc6f66da51168ad3fb60c07a6b4c4d834610d6394f77c581f6debf009a7557. 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/US6YF2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574ee9ec67a5ce28f958462daa0f84c24eb0894387ea36013c6e508d3324ebb1. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/USA2P2350454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e140e2fff8fada11b5d4a332aad3ca48f6f13272902c324a062d49dcabc70c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZSYP2308742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a67acf7d7c21e67929b785687f2a202cadaeec8a0309d1a515ca59f12c50aa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2400716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9927da035fca73ea6bbe9b643d696609cd2eed1bcf6600ca75eb57ea5972d8d. 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/USA2P2408660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88dc1cac7706dfdef9fa96a76fc479022060e20262473ffb26496d47d25612ca. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USA2P2472803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c96ffb2367beca4b2c1d661c109fe3c4298c414d09c99d5d022c2ad6003a14. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USA2P2474396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943790e72a4d3afdf043c6c3e48e3c801215c50e980e4bf39c5aabc3957b1381. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB22583341.