Sophie Marceau (; born Sophie Danièle Sylvie Maupu, 17 November 1966) is a French actress. As a teenager, she achieved popularity with her debut films La Boum (1980) and La Boum 2 (1982), receiving a
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 0xfe3911dc6dc442bf90e9f4bf35ab8f395304088c0bce7cc443f38623ebfaa815. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ad0d156-ac69-419b-aa13-b3d591a999ff.json and https://artists.proofprofile.net/proofs/artist/0ad0d156-ac69-419b-aa13-b3d591a999ff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).