Oliver Martin Johnston Jr. (October 31, 1912 – April 14, 2008) was an American motion picture animator. He was one of Disney's Nine Old Men, and the last surviving at the time of his death from natura
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 0x48ccf573810e557a13ed0ccdc8cd33b2c3c9332b473b58fff34b08d01018d4e8. Chain 2 (Bitcoin): anchored in block 953875 (2026-06-16T02:12:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07d74ea3-a158-4dd2-9c2a-e78d876b2a6b.json and https://artists.proofprofile.net/proofs/artist/07d74ea3-a158-4dd2-9c2a-e78d876b2a6b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).