HF, Hf or hf can refer to: Arts and entertainment HammerFall, a Swedish power metal band Hard-Fi, an English indie rock band Star Trek: Hidden Frontier, a long-running Star Trek fan-fiction series
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 0x9f121ac9fd8a0b27f3487fd70dacd25f8faeb8685a52ee42adbf20b4dc281ebf. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/404fa533-4871-4ecf-8baf-aa519e9a2782.json and https://artists.proofprofile.net/proofs/artist/404fa533-4871-4ecf-8baf-aa519e9a2782.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
MT - TROPA DAS TCHUCA BEL VS FODE FODE #FININHA