Buenos Aires to improve access to personal documents with zero-knowledge proofs

Buenos Aires is launching QuarkID, a blockchain- and zero-knowledge proof-based system that gives citizens digital, verifiable versions of official documents, with release set for October. It was created with Extrimian, a blockchain digital identity company, and uses Matter Labs' zkSync Era Layer-2 protocol as a settlement layer. According to Diego Fernández, the city's secretary of innovation, no personal document is stored in a centralized database or on-chain, which makes the data impervious to hacks. The city plans to add proof of income and certificates of academic attendance in November.