Cadre may refer to: Cadre (military), a group of officers or NCOs around whom a unit is formed, or a training staff Cadre (politics), a politically controlled appointment to an institution in order to
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 0x05dd271a0783d2156973bd6d56075170655bbf99c1b44bb47e3faa3c9c5daaa3. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90f8ff78-d900-4273-8845-1ef32cc314ae.json and https://artists.proofprofile.net/proofs/artist/90f8ff78-d900-4273-8845-1ef32cc314ae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).