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 0x7c4654aebff9f6108bd414373c5f5e6e81a48b21fdf8294f5614a9b17a4a6136. 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/5174322c-89ba-41c8-bdd9-f72b3b0e020e.json and https://artists.proofprofile.net/proofs/artist/5174322c-89ba-41c8-bdd9-f72b3b0e020e.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 0xd02ddf08fd93b0e7845e496117da7da90e8f705c29e81a9eae1deca900ed3a3b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZNWT2017306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980187f49ce9712af0c034d8e1f862673e5ccaeaab04fb4712fefcc0c0d4c090. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZMEM2104864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273b72317994e4ccbfc75b5649208d974d8df51ed28fe3e664285a4f3a4095ec. 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/QZNWR2180361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb294f394871f13b0758baff465f12e9c475ef2ed46e8db0c03217f32d782b52. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWR2180369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb274247666e32c6269aae1423fe9c5068a81703e42b8e8866bf8a01796b3043d. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZNWR2180379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49d0dda98702503c32eb0a372eb42c11ba80393c167862a23e838e95de4eb5f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ22330936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0792d1e9de4756350c9386e2e30178263a492fae6188c64989ee2855017ff1b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ22330937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d72afd0b2a4c2594591aaf0420ec09a0ff7e373f6ac199893c7406254f64ea5. 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/QZFZ22330939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01788df7ed3518d902f47da04b18e251a78beebb8a92e8cecc6a111a653f0491. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZFZ22330940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69318f4a65a5cce2c11ba43f97c9a1d0e2883172e0c05a7209f4691ced929bb6. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZFZ22330941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ffd1ec6dd359d78a15759c65ff3b662b19014d6292c884b847e50104cd4bd33. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZFZ22330942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a33bc24d6acbc8a9d5f883127d633c39cb5a1efdcb7b62a8df1396f0fa93b8b. 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/QZFZ22330943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6106735ca925ce3668b71643ff9329b54d4d686db0534ed7abd932d7ade4668e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTB32315189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24fd2f30bd198137e9434f728f3044b5963c7c3a336f3ab1e2ae4d8f6262f48. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB32315190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf3429cd951ae52cebb74d06b8fcdb90ac556b9edc48c2ad59b836d9e973205. 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/QZTB32315192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23fa25811873413cdb4eb9e3d0c6ab8a987643acd00a856252e8d46f75ce19a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTBB2387925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f7d01c0ab75ba0495e76a8d93e2beaf780fd997386b186d37f145d20c4c655. 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/QZTBA2538224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e48294d7a0ca361835ef717bf45d18f5869df1c8105fc2a828e0c0713404d35. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTBA2538225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c75bb17efb4f4b65542a3e1335783ec22bb97e208f75877de9c490aaf922b3. 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/QZTBA2538226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cbce48f997a6a43172e62e5ae6d1ba70ef49520c7be4f693baabb26d41a0db. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZTBA2538227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2feb6ae3887bd4fe0be035f00deaeaf32038adb100921c39406efe14f197c84c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB92512361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9d41201f3affe09144031f1ea6fbde1da66d50839ed75ba6a653ddf9452704. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN32577807.