Mezzo is the Italian word for "half", "middle" or "medium". It may refer to: Music Mezzo-soprano or mezzo, a type of classical female singing voice whose range lies between the soprano and the contra
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 0xd37ad11181a0a5a42ec0cf3db91fb695d648f7e31c359a22580d6cdf43169a20. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e39477df-fb3e-4a45-9f52-6ee11abd5c5c.json and https://artists.proofprofile.net/proofs/artist/e39477df-fb3e-4a45-9f52-6ee11abd5c5c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).