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 0xa463ef8b10f8e8dd90925c8a8ad58b2b7ec246578b3aa7be1d5e77dbcc82bcd0. 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/6a2e5985-fc95-490e-a2c9-2bafa28556d4.json and https://artists.proofprofile.net/proofs/artist/6a2e5985-fc95-490e-a2c9-2bafa28556d4.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 0x93183f02676b7297e8f21cfed89c713bb8cec86d522beda036327b57e887dedd. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USV291358796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41e32e0f1445b639276536c1037325762f0042b7e85c281894c321e59eeceaf. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/COF010600089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0e1254022627b3377de66e41f733d55d1b9296046c74e77f93c530e4cf5aaf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ARIXB2202100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae8b671f9e995cc966f13ae618089d9e1146b1b6560e30893123f7be1ec469d. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/ARIXB2309982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a7e43ba94849b13dfb6ce226c6109a2fc2fecad4a7580699e46b18d68cb5b5. 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/ARIXB2309983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a7e43ba94849b13dfb6ce226c6109a2fc2fecad4a7580699e46b18d68cb5b5. 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/ARIXB2309983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52822b493c0cb56cdef94d6d78e0730af385a652efcf3b8426d1fb4fdcf6bfd. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/ARIXB2309988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb3c992250c38af92f2b01c39e22ad6b339189d46edb19f99408b3cc2567efe. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/ARIXB2400504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68078e7151bc5cc7509006516e457c49a568260dd2d319b2c4c75bd3f78d93a. 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/ARIXB2500246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6dc7a80cc44734d551f56fe286d9f5860fd271f851b3aef16e0a8a1a0dd430. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/ARIXB2502011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f4d0a2188f56bc5ded96b436a809ce58221b9e692b702f5326148c52292f18. 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/COC012033682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4cfc0b112eb752781bacc8598242ca318daec5b8e1ee03b3b5e2d1ef4640e6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/COC012033683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe511d529118f4b1a3ff95f601a0adf8ccd16c6863457354aa6570ab40d780195. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCABN1367311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3ba412518d0061472804cf06ff2ba1af2f7849f92c3f89a0629549945f92fe. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TCABN1367312.