Madré () is a commune in the department of Mayenne in north-western France. The maternal great-grandfather of Saint Thérèse de Lisieux, Louis Macé, was baptised in the village church on 16 March 1778
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 0xdc259f09382b967952a9f4b7dc9d9940ad8aa34eae4f6d9fe3aad8c3bcc3719f. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/83691c42-53ca-41df-a56d-e775517c8847.json and https://artists.proofprofile.net/proofs/artist/83691c42-53ca-41df-a56d-e775517c8847.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).