Jack Bushnell Hanna (born January 2, 1947) is an American retired zookeeper and director emeritus of the Columbus Zoo and Aquarium in Ohio. Commonly nicknamed "Jungle Jack", he was director of the zoo
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 0x93485453c230a60565b8847f16c2a79fd62a696d91f71a3c2de431880256b4c6. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/70acc6f9-e416-4683-8219-ced7eab25aed.json and https://artists.proofprofile.net/proofs/artist/70acc6f9-e416-4683-8219-ced7eab25aed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).