Black Fire may refer to: Film Black Fire (film) (Fuoco nero), 1951 Italian film Black fire (also titled Blackfire), 1972 Australian short film by Bruce McGuinness Literature Black Fire: An Antho
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 0xbf2203586d225e0928cd6287439c514aa14a4c221fa8987af1a2701ea9879ddd. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1aab0f12-68c1-4bc4-88df-803d6059d5ae.json and https://artists.proofprofile.net/proofs/artist/1aab0f12-68c1-4bc4-88df-803d6059d5ae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).