Sergio Rodrigo Villagra (born 11 October 1973) is an Australian rules football goal umpire who has officiated in the Australian Football League since 2002. Early life Villagra immigrated to Australia
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 0x9de1461e53d3a0183acc1b6890cf9ba70c55cd5cf6736bf77999b77e0e76cbdc. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f69057a-f9d8-4b2f-8a66-fa409518a731.json and https://artists.proofprofile.net/proofs/artist/7f69057a-f9d8-4b2f-8a66-fa409518a731.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).