Leo Lionni (May 5, 1910 – October 11, 1999) was an American writer and illustrator of children's books. Born in the Netherlands, he moved to Italy and lived there before moving to the United States in
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 0x2c1987d2a2e16160147950e56a000144e658a3aa4db4d26da38cf6297aca8da0. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/085bd39b-da8d-44e9-85c1-1aad127b0c69.json and https://artists.proofprofile.net/proofs/artist/085bd39b-da8d-44e9-85c1-1aad127b0c69.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).