Farz (Persian: فرض ) is a Persian word of Arabic origin, also used in Urdu and Hindi, meaning "duty" or "obligation". It may refer to: Film Farz (1947 film), a 1947 Hindi film Farz (1967 film), a
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 0x74041bf3f0e0bd3b91559a6184452f0bf768dc6e5b9e88b91a473249cb3077b6. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f469417c-605c-4882-bb36-16a6ec63da87.json and https://artists.proofprofile.net/proofs/artist/f469417c-605c-4882-bb36-16a6ec63da87.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).