Which blockchain application has been successfully implemented by a national government for enhancing electoral integrity?

Blockchain technology is revolutionizing how governments manage sensitive information, ensure transparency, and secure digital transactions. While many focus on cryptocurrency applications, governments worldwide are implementing blockchain solutions for various public sector functions. This poll tests your knowledge about blockchain adoption in government sectors and its impact on public service delivery and democratic processes. Can you identify the correct blockchain implementation that has been successfully deployed in a major government initiative?

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Estonia's KSI blockchain for securing government data registries and e-voting systems
United Kingdom's Ethereum-based parliamentary voting platform
Canada's Hyperledger-powered federal election verification system
Australia's Cardano blockchain for real-time electoral result certification