Alberto San Juan Guijarro (born 1 November 1967) is a Spanish film, stage and television actor. He has featured in films such as Airbag (1997), The Other Side of the Bed (2002), Football Days (2003),
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 0x43ddcd7382584633cca90be5a21229faec468cbae7a7fa03cc4ce7b9acfed6ef. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/804a30b8-e575-4055-8380-8ea845cbc426.json and https://artists.proofprofile.net/proofs/artist/804a30b8-e575-4055-8380-8ea845cbc426.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).