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 0x23387a656c1f90d48e84886aa57c0aff18011f645285d741885eb0ee799545c1. 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/294362d8-76f6-420d-99db-34d0f55382bc.json and https://artists.proofprofile.net/proofs/artist/294362d8-76f6-420d-99db-34d0f55382bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x444b18135a9051134a81c999e56c8463936f9102541d0acddd9c9f9035b28b87. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZHN82349050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fdad49d35c5172f6f89acf2beeb9866c2deab77d36d8df486f6fb0b973187e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6L2316739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297a693b541f93db9e480c6a351e0de4ac0056ff6c2e0cd261efe908d5ca8e96. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZK6L2316741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc788bec7b2eab6c0d4b6f9f01f198a0ac27774d25561f2a462d10a6fb06ae781. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6L2316742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da9933dc52ef23c7093cc8bfc00d41df2fec59e68d1107182f378ccb84d6d8f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZK6L2316743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfe3db89107ea5a57920a35d1b9d977222b4cb208a82df84c3d11b3beed242f. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZMEQ2340118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c77c123eb113d12cb6e72c24b2300e67e386317aba6f27f3a59c5f486dfcf0b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMEQ2340123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66319217fe7d2091bdd6e314471aed5eaf7ed1488979409f56c107c924e18c8. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QZMEQ2340117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae754258b60c49a9769ae52083051beb90a612cc922e9575daecc5cc8e03326d. 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/QZMEQ2340119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c6fc482ccc501e3b7a5fdd062e9e543aa0a3e03b6a509d72616cc316d4f556. 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/QZMEQ2340122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef3eb16951ffebec00928233ee6cfea036008e2a4a72076afac207189227abc. 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/QZMEQ2340120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b2a27ffe44a3afd3481653983855afbfdbf8f7f49c9f01f1183aa93e0f874f. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZMEQ2340121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57816f94b09087fda329888ef9b9d8eaf03428de024e4d8c477afe258b5834ab. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMEQ2340116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e8312bd0ad82d867d40ee4b25ad321460e2f86aad82cf4e7c347f26560e7d9. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZNWT2358834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e610774e280a2d3aabd04626ef2d562a9100d7f5beace5d97ef5d09b80045ad. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZNWT2358835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b04ed41db4088c1d48d6b4a6ecb70d7c646496b758db0d281a30c68504d3d6. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZNWT2358836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a2ebbfdeb6533423c109300c5c9f542a27bf90a5b5e26ffe988d8174159363. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAS2364233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4885962519bfe05ae45e6b614482c74438c314d1becdc6446d848fa7ee2edadc. 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/QZTAS2364235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fdd28590335517bd99ef07c07f44a347557c85dfa37b3033726680b32f2ad4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTAS2364236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cbb9e59ca99e3b0288556a6e80a93a8abf914b4994e34ae9d78a5fdb0dae66. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZTAS2364237.