HUF may refer to: Places Terre Haute International Airport (IATA: HUF), in Indiana, United States People František Huf (born 1981), Czech bodybuilder Hans-Christian Huf (born 1956), German hist
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 0xb9772261d8c2572cbb522a97868b7c2c41296f3439a5795a97748c87813f985a. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7fffd2bb-0264-443b-85fd-3932d664b7ed.json and https://artists.proofprofile.net/proofs/artist/7fffd2bb-0264-443b-85fd-3932d664b7ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).