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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d86b39e866d210b2d9f13ea9ea4aa372579e12796b4f1041e4831a7cbd30939. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a729fa00-dba7-4fec-b97c-1d2656a1331a.json and https://artists.proofprofile.net/proofs/artist/a729fa00-dba7-4fec-b97c-1d2656a1331a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001a941420856017aec589f6a92dc871457624f06a4b90c3f63b48984aa6a5a0. 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/QZNWT2529730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c13d0d3fa694b7d46de940840ef7c6a01d2fe569ef322f0fb62a343ae71f43. 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/QZNWT2529731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978b604ff6dea86c9828cb09e683292f03b8b7a48aff51c46b18e7f39aed7777. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:59:10Z), 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/QZNWT2529732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86811a3c83acfb5dc1641eefaa4710d4c548da476a5c25f7e26f56af5affc833. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:14:48Z), 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/QZNWT2529735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e661bc96882f96e9930afbe3e7872144f3675443897237af997374fe7b3098. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:41:42Z), 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/QZNWW2587388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24ace8b06e83dae96619902587815b015ed4fc97cd7efab6ddfc40aaab0c4cc. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:45:40Z), 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/QZNWW2587390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ccbb55d33cad744da0e15f93416971c4980907da26ba61c6731359d65da5969. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T08:03:49Z), 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/QZNWW2587391.