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 0xf4cab25ffa4493064a5bfa67699ca6d6d35d32b66ac533d48bb928563100b643. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26959241-8650-4037-9fd7-fdb4c53d3d86.json and https://artists.proofprofile.net/proofs/artist/26959241-8650-4037-9fd7-fdb4c53d3d86.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 0x56b6593c85e6f050bc18303da0f8ff072454053c6152cb5e5db3342900854b45. 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/DEH742423086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f76f36bea78b1930eba8cd541b6bd2c242edb0523dfd6b48a72edca758fe8e5. 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/DEH742423087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9830e64c738dfb5852619a74cd2bcf148984337eb215bd59cee369ca7734390. 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/DEH742423088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd607e786563a9b33ac944b1026442846beab7ef2fb612f02ddde89ffaf840350. 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/DEH742306181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09baee78324007dc7f60770902d2632edc529626474e7208b17432c8800911cf. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEH742306182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc4611d0c6b998cc30af307705380fad7e6bb5a11efc159b5bde1bd518318a6. 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/DEH742331390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75cc7cb75e3aa6c9dfa7c37fc0fb3cf429bf99dab7c837a7859435273602653. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/GBSCL2535035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6659cedcc484b96b5f7acbb21485773891798c493095b5c522a2e2fbd7c49614. 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/USNRS2544033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b6d8d9eb4a8ea027c28bd58bcecf8ce47aef71d8d276d0d4fd10941c8f0e01. 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/GBKQU2500403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ad85e1dc25d6202c36662d342cc1c21679160cee3bdbadcb3a57c08ba79311. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBKQU2500404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08c8602ab41a1b84ea307c32f60b813e3ea11464881a3046e1ae8732b91bf04. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEH742439100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88738bcfd9f53178719301333c913783fdc56455618e1d4503b03aa2b4c37c9a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZZ8A2422209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d028bc8c7522246a02592b266bb39dadc205e8317d891fe896317a038ba401. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZZ8A2422215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cd401e79ea65b39ef2c720aa3764f13e0c5701d70007f9c8ccfa17e31e8aac. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTBB2434382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe436ac31f25c684d280e08dbd4ac83920cd6bec96fa0cc9facbdf2bdfd6af971. 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/QZTBB2434383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d31b4f11b2741b5461e6d8a088f51d1be1a0f7bacc78f3ddd902b31dfb33f32. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTBB2434384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533764df9f40eddfaba3c2590f9d69c0879d6b6b186d7bd8ee176c7f99684e9c. 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/QZTBB2434385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfbf418fe550da563424699f094db82f9fc8c6cd4e51182b4b01a5fd5d0b906. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEH742431272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69920ae6a11f331401705b61b903e7feea79c4cc75ece5de55ca3951747cf553. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/GBSCL2535037.