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 0x25994c7a7a737c8bcd78c19f81b9c7f1923cdb8f79e1a6f22b946ef73057ac5b. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/546d89fe-9f0c-4ba7-9891-a5d639e3a893.json and https://artists.proofprofile.net/proofs/artist/546d89fe-9f0c-4ba7-9891-a5d639e3a893.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 0xd11098f052d62bc69bc99a29bbd79fafa457b2e8b5fb7958ecef353c15a066c9. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:31:27Z), 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/DEZF22000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32acb978b05d38a6dddb09e67cb2a1ab6dff56bfcb901a522fbd13f7ab72ee41. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:15:11Z), 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/DEZF22000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac9e6410a98c2e0eac3724332dc8621a5dfbaf1986bc4a60b1048a44caa4834. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:42:56Z), 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/DEZF22000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd40ece8d06876586a35b5a067b597f3b24bac9c8f8ea785c62c5bec1c29277d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T16:04:41Z), 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/DEZF22000092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab347a5a9e9fe814ca6bbe871c9c6a0c6942f8dabfedafd6b15f9a02e2da982. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEG931892071.