TFX may refer to: TFX Program, a fighter aircraft requirement for the United States that led to the General Dynamics F-111 Aardvark TFX (video game), a combat flight simulation game (full title TFX
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 0xc4a9a037a44e42b1e938531c9a96508ead8019fde9b073cbd791a12281e113e8. Chain 2 (Bitcoin): anchored in block 953928 (2026-06-16T10:21:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e11ce5a-fe4f-44c5-9bef-2ccd86ef208f.json and https://artists.proofprofile.net/proofs/artist/1e11ce5a-fe4f-44c5-9bef-2ccd86ef208f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).