Sergio Bismarck Villar (born 5 January 1944) is a Uruguayan former footballer who played as a left back. He played most of his career for San Lorenzo de Almagro in Argentina. Villar started his caree
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 0x21360f4d64253c4efae133c663232cf06a03467677c3beb4a41fe7c5a78667f0. 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/e00e0279-de90-4b29-876b-8342dbb445a1.json and https://artists.proofprofile.net/proofs/artist/e00e0279-de90-4b29-876b-8342dbb445a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).