Hoffmann is a German surname. People A Adolph Hoffmann (1858–1930), German politician Albert Hoffmann (1846–1924), German horticulturist Alexander Hoffmann (born 1975), German politician Andrew Hof
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 0xb1cbf7920ffa6c7d9c4197d84d2ea9cd8d3e1cc4e10c7e9314b5b7458f871a92. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2304ca0d-c9ef-407c-97ee-36dae8be6e83.json and https://artists.proofprofile.net/proofs/artist/2304ca0d-c9ef-407c-97ee-36dae8be6e83.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).