thumb|215px|Leo Fall, 1915; by Rudolf Dührkoop Leopold Fall (2 February 187316 September 1925) was an Austrian Kapellmeister and composer of operettas. Life Born in Olmütz, Leo (or Leopold) Fall was
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 0xb19a6872e8033fae0b65197a05ac1bd80fe849b156b9e34fdff5b88e9ea00683. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22fad95b-8a2f-4646-aa43-90ee1faaa5a1.json and https://artists.proofprofile.net/proofs/artist/22fad95b-8a2f-4646-aa43-90ee1faaa5a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).