Taupe ( ) is a dark gray-brown color. The word derives from the French noun taupe meaning "mole". The name originally referred only to the average color of the French mole, but beginning in the 1940s,
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 0x29b0a201a9995ff751bc578b34e97a70691213a3f878350dd09de5d631d93836. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/edbc4dcb-9048-48ec-9057-13ea0795a90f.json and https://artists.proofprofile.net/proofs/artist/edbc4dcb-9048-48ec-9057-13ea0795a90f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).