( ; ; pl. ; ; 1512, from Middle French , literally "my lord") is an honorific title that was used to refer to or address the eldest living brother of the king in the French royal court. It has now
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 0x3f0351b2b495a665c2ad03798a89937fd62003eb81d965ca8110b8a6db730710. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c017033f-9707-4168-9226-988b566c0483.json and https://artists.proofprofile.net/proofs/artist/c017033f-9707-4168-9226-988b566c0483.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).