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 0x4b00993aec7bf5cf9d13bca99d122eb9e86db8cdfaa366e0f0c6f92da00268c7. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05e8dcae-d9e8-4cd9-8d36-548a43901520.json and https://artists.proofprofile.net/proofs/artist/05e8dcae-d9e8-4cd9-8d36-548a43901520.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 0xeadfacdffb1e5ba8ea5a6dacf25c941f540e1a03c590347c6979e4aed52196e5. 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/ES22C1200426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44aa9f0eaa895cf7e7c36e8e56b5850b4bd2dc3e8c4686d2a7c8aafb46f7b0c8. 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/ES22C1200428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeadfacdffb1e5ba8ea5a6dacf25c941f540e1a03c590347c6979e4aed52196e5. 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/ES22C1200426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44aa9f0eaa895cf7e7c36e8e56b5850b4bd2dc3e8c4686d2a7c8aafb46f7b0c8. 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/ES22C1200428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6ec1c16f37e049a7acd053ec7f22930129351bc58ba26663264725eddd1296. 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/USA2P1668229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe313b3f3b5a39302a857899f27b50e58669134323bf934a8186701380e9b2730. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:24:19Z), 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/QM4TW1952494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af0920d8f4fce052ed7ac7d96fe2ed87ac3c12c075683537fef8c86972a602e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:01:15Z), 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/GBBFL1900755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2837a27fb61a042a9f7afea7153d0142f609ce410173f8082406ee187f6fae20. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USA2P1893485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453cb5d6194dbf62d5165295a3f8015451936178716dc89c72240852292bdef3. 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/TCAGB2237717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940d037be23ac518be792b380c0c5c1fe306db08befbb065fea3f903e2daa80f. 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/TCADP1828471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfcb2a40a992f54cacc7ed8241fec6569105e2ec86246c5110c389d4be415d35. 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/ESA011410515.