The service, QuarkID, has been integrated into miBA, the city's seven-year-old app for accessing municipal services and documents. The idea, in short, is to give 3.6 million porteños - residents of Buenos Aires - greater control over their personal information. The ZK proofs will let users show that a document has indeed been authenticated by the government without disclosing information that is irrelevant to the task at hand.
The decision from the beginning was to create a self-sovereign identity system so that citizens can have privacy and security over the documents they acquire ownership of," Diego Fernandez, Buenos Aires' secretary of innovation and digital transformation, told CoinDesk.
Zero-knowledge proofs do not require a blockchain to work, but QuarkID uses one: the Ethereum layer-2 network ZKsync Era. According to QuarkID's website, the blockchain serves as a "security anchor," meaning that it's there to prove a piece of data existed in a particular form at a particular time.
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