Fifi may refer to: Arts and entertainment Fifi (Better Call Saul), an episode of the TV show Fifi, a Beverly Hills Teens character Fifi (Peanuts), the love interest of Snoopy Fifi La Fume, in Tin
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d718fdee262ce6ca2c302a409fc3675dd37dceeb16fa426a56a5cae228d45a4. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b9bc4fb-00da-4722-8d27-04d07b16f5a1.json and https://artists.proofprofile.net/proofs/artist/2b9bc4fb-00da-4722-8d27-04d07b16f5a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).