Robert Hoff was an American football player and coach. He was a three-time letter letterwinner at the University of Iowa from 1948 to 1950, starring as an end. He served as the head football coach at
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e69700cea981180d22bf341733118e8a1a4ad8435c74032be5dd5cf37c0a01d. Chain 2 (Bitcoin): anchored in block 954174 (2026-06-18T03:01:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7e7042b4-2e1f-4c21-9702-fa76a79086df.json and https://artists.proofprofile.net/proofs/artist/7e7042b4-2e1f-4c21-9702-fa76a79086df.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).