Marthe Mercadier (23 October 1928 – 15 September 2021) was a French actress. Filmography Year Title Role Director Notes1950 Le tampon du capiston Mélanie Maurice Labro Three Telegrams A bandwidth H
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 0x289c3af94b46b977339dfd2e9ac8265b85eb4e083ec15d39d018a4b77148a8c3. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1ed76f8-1e73-48a9-beb4-6b6898867d8d.json and https://artists.proofprofile.net/proofs/artist/d1ed76f8-1e73-48a9-beb4-6b6898867d8d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).