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 0x196940a0f28ad894853fd518c65e31cee43a56ef854d2e710d79e3f0930c5fcd. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2ef01f3-7ce9-417b-a8b9-c9de482793f5.json and https://artists.proofprofile.net/proofs/artist/a2ef01f3-7ce9-417b-a8b9-c9de482793f5.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 0x70a3d974873cd018c25cd287e6d6b5d7396beb46a626227abac7048fdb4127a7. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/TCJPF1799350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb302e22bb0468b773d4d1d96d5d8a3e09045889a3572b238c85b5e9639804cb1. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T05:01:34Z), 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/TCJPF1799344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea79ae255d9ca80e324de50d0ad0eb09bcd3ebe114d5945a96b6d0f7da88172. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCJPF1799348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443c30b6ec5560c4988908151bd9c04d91930709cbf700209db010fcb8f0120e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:38:33Z), 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/TCJPF1799349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a3d974873cd018c25cd287e6d6b5d7396beb46a626227abac7048fdb4127a7. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/TCJPF1799350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7936c69bc0aafe115f9f76272ebda155c18a365620b2ec31e90b6cf26a6ca1. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/JPR841800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa895588aced4499b15d26040e1a43ba4ec0b0637f1e97d1362e54d654cd9748c. 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/JPR841800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba9cd1ff77d8f3cbb328af31ecb76142e13a8a07c67d4088716bac78924c202. 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/JPR841800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa895588aced4499b15d26040e1a43ba4ec0b0637f1e97d1362e54d654cd9748c. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/JPR841800025.