FCB may refer to: Banks Fairfield County Bank, in the United States Farm Credit Bank, part of the Farm Credit System in the United States Florida Community Bank, in the United States First Comm
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 0xce418ad7c308201983664450bd348709ca0394f02789f462ee63dfcf422bfcc1. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b46fb3a-ac67-44c5-aa16-7b2897931b0d.json and https://artists.proofprofile.net/proofs/artist/0b46fb3a-ac67-44c5-aa16-7b2897931b0d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).