Rubén Isaac Albarrán Ortega (born February 1, 1967) is a Mexican musician and a member and founder of the alternative rock band Café Tacvba. As singer and frontman of Café Tacvba, the artist has chara
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699935c1fb82929d602011a6938e56dbd00b8c51185df724a3f801329bee515a. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/222f106a-1336-44a2-b8a1-1c60d0e4d1e3.json and https://artists.proofprofile.net/proofs/artist/222f106a-1336-44a2-b8a1-1c60d0e4d1e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).