Which groundbreaking government digital product was the first to use blockchain technology for securing citizen identity and official documents?

Test your knowledge about how digital product development has transformed government services! In the era of e-governance and digital transformation, governments worldwide have adopted innovative product development strategies to enhance citizen experience. This question focuses on a landmark government digital product that revolutionized citizen access to services.

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Estonia's e-Residency program
USA's Login.gov platform
Singapore's SingPass digital identity
India's Aadhaar biometric system