PNF may refer to: Places Nature Park of Faial, on Faial, Azores, Portugal Nature Park of Flores, on Flores, Azores, Portugal Penyffordd railway station, Wales Science and mathematics Proprioc
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 0xa33cd4538990838f4b73f1ca4e7d82ed74449272440aae8d7c41beb94b1f0cd8. Chain 2 (Bitcoin): anchored in block 953871 (2026-06-16T01:46:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/071d5368-a91e-4da5-bb63-9c0bc0727e71.json and https://artists.proofprofile.net/proofs/artist/071d5368-a91e-4da5-bb63-9c0bc0727e71.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).