Sergio Castellitto (born 18 August 1953) is an Italian actor, screenwriter, and film director whose career spans more than four decades, having appeared in more than 70 films across drama, adventure,
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 0xa5d8687de0d40d0810583f846c7395bf7fa12d565e3e3ab45d82d84bed9d002f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e0b7965-e3e0-4c3e-8b6b-1cb494357f47.json and https://artists.proofprofile.net/proofs/artist/5e0b7965-e3e0-4c3e-8b6b-1cb494357f47.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).