Mozart's Sister (French title: Nannerl, la sœur de Mozart) is a 2010 French drama film written and directed by René Féret, and starring two of his daughters. It presents a fictional account of the ear
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 0xf9d2ba987747ce3a0eaea2e9361922638d37a5d7332acbb38030fd462a9fe17f. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8301b45-08e7-4ca3-bef0-36d5c9cfc86d.json and https://artists.proofprofile.net/proofs/artist/d8301b45-08e7-4ca3-bef0-36d5c9cfc86d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).