Bob, Bobby, Rob, or Robert Butler may refer to: Politicians Robert Butler (diplomat) (1897–1955), U.S. ambassador to Australia (1946–48) and Cuba (1948–1951) Robert Butler (MP), 16th-century member
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 0x2e79a5d6f4c31d578a3cb1c125f1cbb71b7c9add5f6624865de9579961e3653b. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ceeb1435-f28b-452f-b88c-86f85e2537ae.json and https://artists.proofprofile.net/proofs/artist/ceeb1435-f28b-452f-b88c-86f85e2537ae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).