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Experts this week warned against entertaining the idea that blockchain could fix the voting system despite growing frustration with the long lines and malfunctioning machines that caused problems during the midterm election. “If you’re trying to convince Walmart it needs blockchains to track avocados or whatever, be our guest,” Arvind Narayanan, an associate professor of computer science at Princeton, tweeted. “But if you’re messing with critical infrastructure, you’ve crossed a line.” Blockchain is technology that uses computers to build a shared, secure and decentralized digital ledger. Blockchain is best known as the basis for the cryptocurrency Bitcoin but in recent years has attracted interest from a variety of industries that see a benefit in using the ideas behind blockchain.