Leontine or Léontine is an English and French given name, a feminine form of Leontius. Notable people with the name include: Sister Leontine (1923–2012), Belgian Catholic nun, nurse and doctor Marie-
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 0x4531336cf5709ac203e7df9a14ffe0f2f771f4217a1fef91703858a205e6fc3f. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a427e070-ca92-451c-8d68-244c73c79bc4.json and https://artists.proofprofile.net/proofs/artist/a427e070-ca92-451c-8d68-244c73c79bc4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).