Decentralized digital identity (QuarkID)
From 1 October 2024 every active user of miBA, the City of Buenos Aires's services app, was given a decentralized digital identity through QuarkID, the city's own open-source identity protocol. Identities are anchored on ZKsync Era, an Ethereum layer 2, and residents can share credentials such as birth certificates using zero-knowledge proofs, without handing over the underlying data. The city counted 3.6 million residents at launch.
In the record
24
Months since it was first seen
7
Institutions of its kind in the record
Other public sector deployments
- Royal Government of BhutanNational digital identityOctober 2025
- State of WyomingStablecoinAugust 2025
- U.S. Department of CommerceOfficial economic data published onchainAugust 2025
- State of Colorado (Department of Revenue)State tax payments in cryptocurrency, ETH among the coins, converted to dollarsSeptember 2022
