thumb|A dark roux in development thumb|A white roux thumb|A roux-based sauce Roux () is a mixture of flour and fat cooked together and used to thicken sauces. Roux is typically made from equal parts
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 0x2dc460913c910abebe22191d2aa3f85b7119768210c9498abc237ff9cf13a2ac. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35d46f4f-97ef-474e-bda6-e56eeefa2b28.json and https://artists.proofprofile.net/proofs/artist/35d46f4f-97ef-474e-bda6-e56eeefa2b28.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).