Which government-led cybersecurity initiative was first to implement blockchain verification for citizen identity management across multiple federal agencies?

The intersection of politics, government, and digital security has become increasingly important in recent years. As government agencies modernize their digital infrastructure, cybersecurity concerns have taken center stage. This trivia question tests your knowledge of a groundbreaking security initiative that changed how government platforms protect citizen data. Do you know which innovative program led the way?

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NIST Secure Digital Identity Framework (SDIF)
GSA's Login.gov Distributed Ledger Authentication
DHS Homeland Advanced Recognition Protocol (HARP)
FBI's Federal Credential Blockchain Initiative (FCBI)