thumb|right|Mezzaluna with a single blade thumb|right|Mezzaluna with a double blade used for chopping herbs thumb|right|Mezzaluna with a triple blade used for cutting meat A mezzaluna ( , ) is a knife
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 0x918cfe03f114c0973aa445a22c88f9f3f71ca6054a3b39f86121b9a75a5a6c38. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a065434-fcd5-49d3-a06b-730367f55536.json and https://artists.proofprofile.net/proofs/artist/4a065434-fcd5-49d3-a06b-730367f55536.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 0x05568e565a18fb867a37f2f95f675e94080ce6c5070f908573eb7d88240da245. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/IDAC52200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84270021e1fa36a0c4ae39b72592bf85a6bcad7a453e7693bb55b0a9481c1f4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:07:54Z), 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/IDAC52300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475be6f9b33f0f0d290d72f202837e669c4a27a7bbda8543d30cf044738942f6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:51:07Z), 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/IDAC52400199.