La pura ("The pure") is a 1994 Mexican film. It stars Maribel Guardia and Manuel Capetillo hijo, directed by Roberto Guinar. Cast Maribel Guardia ... Pura Manuel Capetillo hijo ... Rodrigo Rafael
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 0x78271f4ff99b4dc24ea9f5d82be7c4aa759ca57654777e06d9559286252e26e1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07ef67f6-5fb2-4ac8-a018-a1c8bfe36d5b.json and https://artists.proofprofile.net/proofs/artist/07ef67f6-5fb2-4ac8-a018-a1c8bfe36d5b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).