FDV may refer to: Federation of the Greens (Italian: ), a political party in Italy Festival du Voyageur, a winter festival in Winnipeg, Manitoba, Canada Fiji disease virus Fill and drain valve, 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 0x2b2b6cca887471c5fe2a8fb0f6a624959b60f7164e3ec153a33dbda00b110985. 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/f32ab647-0ceb-4549-b39b-948ec7d6d508.json and https://artists.proofprofile.net/proofs/artist/f32ab647-0ceb-4549-b39b-948ec7d6d508.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).