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 0x6824a719431dad776ce234b96fae78b59e6c4a20a9c5c0b56bb98c91235e5746. 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/65aa813c-4ea8-45a3-9f10-9fc0a69008f8.json and https://artists.proofprofile.net/proofs/artist/65aa813c-4ea8-45a3-9f10-9fc0a69008f8.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 0x7dfde90d96cc3ed21aa8551aeacf80c830b34e31e456041cc97de45aed4b969e. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZK6Q1932439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38af6776e2a21c624983611019700d8441496c392b45774e74213f904427f2bf. 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/QZGLM2138111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38af6776e2a21c624983611019700d8441496c392b45774e74213f904427f2bf. 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/QZGLM2138111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbddfc14fce5065abebe3f078e5598a8afa5a7b022b32045fa5472fb8a5f436d. 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/QZTPX2421551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e29f348f18ad39cbaa6a2fb91c30b3725f97575453823ef79670a248222ef4. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZW9K2489461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df5d275c8d6672f2f897790094788562072805ed474f1a5f7bf9306a7fc085f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CH7812547185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdcddf72cc0f914260f94c5568f020bc4bf1af802b4bde1e04f78161f0eeb07. 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/QZHN81926026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16772e7dc8d4e62b4bbe27ec7451895adcdc1caddcd7f5677f56ebe9fd1435c. 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/QZHN81926031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e13c33e20a130615ea4d202752e7fe0551c9e292ef250ef8cf2507fe7554475. 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/QZHN81926035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea0d583ec8507e7ff301657cf06178962d867e84e7f9cdfa876464c8d30305d. 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/QZHN81926041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fc459aa463be732edcdd7a82b0e5680fbc05a1b232171ac4492f32cdbc71b2. 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/QZNWY2071169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd07e68cb343b5531751951bbb2fb3c06e0df864e1be667320457161cd6b4956. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2476557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0152b81ca54ba29dcbfd0ab401ce8db334672a3718bf1c8d46ace7e3442b3ad2. 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/USA2P2476558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c8952393c1452c6966769e19065702c88fd38e7c9222d0358ddf86aa998404. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2475186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3192d32bb0b3b954803bd663380463c3972995e14bd6132f0e0b63882a9bf5f5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2476559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ee82898fe57c1669a14894ffb1c10182691b8d8e740c7bde07c96a2281ea64. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P2476562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcae006df9ad8e1e27dbafb4852e786660a9afca0c00f8bea25fc3c124e8e80. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P2476563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3971eb4e2da326cdb9b3648a5facb571e424524f5c967b115162f7b86e0d6515. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2476564.