B2, B02, B.II, B.2 or B-2 may refer to: Transportation Aircraft AEG B.II, a German aircraft during World War I Albatros B.II, a 1914 unarmed German two-seat reconnaissance biplane Aviatik B.II,
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 0xf8c51e357f00e1e7a8a77bee694489b5e78fad3ff17f432b0c7df5546b8a1abe. Chain 2 (Bitcoin): anchored in block 954017 (2026-06-16T23:38:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36b66dd9-8037-4c23-bf26-122cc86bd60a.json and https://artists.proofprofile.net/proofs/artist/36b66dd9-8037-4c23-bf26-122cc86bd60a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).