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 0xfd70a0d441a9bb906b9f7ab722557c5229f044a40f6e2fe23aa84a74410cb14f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ad58bac-9514-4477-a3a0-5f1c9ebf3a62.json and https://artists.proofprofile.net/proofs/artist/5ad58bac-9514-4477-a3a0-5f1c9ebf3a62.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 0xb97bae66390872c1ee131b73298baccbafd1e8abf2aefab0d0a672ca8d073fa6. 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/JPW561809327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cbb0ca50993d68c59e586874a506a35bec15e749cd7547ec1fc4a692022c29. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPW561809328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c82c7afe0ecf2d1aab286d923780b0d3b2d59b179a92c1b937ffe62b69a112e. 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/JPW561809329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9d43b95fb637b083aacfa4b5ddc1fe8293486e2b247084cad2be9875775aab. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPW561809330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e51f1c5217d0102a194680b6486cf0635ba1d0277e1005d3b6daa9c3dac818. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/JPW561809331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8258c2e2f93ebdeb645163af2749d6999d02e2cc77c8c73e884cf843ad6b9817. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/JPW561809332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ded73e2013953de093ec35dc3872e303f48e02f0f5bf23b6c283dfd185887c7. 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/JPW561809333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4dee036f678c2aebf4bb2b9ec6184e10c3ac3e67b707a477e5df47a947e5ea. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/JPW561809334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b233478d9009eb6e6efdf43f27476b9fa9110c46ea1b2cfdae4dc541fa06d88. 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/JPW561903025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedac123ae50862c22bfb035981b9cb5bf37b3ca1e8a72eb29863a69c88bd8f3c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPW561903026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90def2bf1dbb5146bddaf5f1166d853b58bd1d6fceb78ccbfdad35c7f28739de. 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/JPW561903027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ca514e41db164551214fb0ac226c7800eb894d9b447bcb9440da7f709fb901. 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/JPW561903028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda4f000285c61bc8a4181422f9590d39d2d79724f638b8d3f65728900fc32a4. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/JPW561903029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91d00e9c49d32118353f95275fa8ee8be6144464323bae7ea128ff489071ba9. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/JPW561903030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0bc286d934ffa9a521ba85f7e1f20844858ecdfd08aff27f46fafcec9c61c1. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZPJ32198062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd706cc3a0bc47726d897dd4ba7ee47405c39263a2ab5ced84ba013a7310e3566. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZPJ32198067.