Robert Buck may refer to: Robert N. Buck (1914–2007), American aviator Robert Otis Buck, model for Norman Rockwell's Willie Gillis World War II series Rob Buck (1958–2000), musician with 10,000 Mania
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 0xf7292db16ab7beabcd277ad0103f9754588a2a61a36e55255f6b98f41aa68c81. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba72f0ab-0bc5-4f16-a476-d13585d8468a.json and https://artists.proofprofile.net/proofs/artist/ba72f0ab-0bc5-4f16-a476-d13585d8468a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).