A secure voting system should be as secure, or even more secure, than opening a bank account or a crypto account at an exchange. Some of the crypto exchanges are even using biometric face scanning! The slightest mistake in your application will put you in purgatory until everything is worked out to their satisfaction.

Blockchain technology has proven to solve the "double spending" problem very effectively. The Bitcoin blockchain has existed since 2009, and no one has successfully hacked the blockchain directly. It's secure. Why aren't we designing a system to issue voting tokens to each voter? Each person gets one token for each of the races they are eligible to vote in. They can go into the voting location to spend their tokens on election day, or even spend them on a secure banking style app on their phone from home.

Another method would require only in person voting, with paper ballots, and a blockchain backup to detect errors and provide an early indication of results. The results would not be certified completely until both the blockchain and the paper ballots were properly counted and verified.

Why is this so hard?

One answer for why it is so hard is that the deep state would not allow such a system to exist. The people designing it would probably die in car accidents at a rate that's unbelievable. Truly secure elections with no chance of cheating would finally and completely return power to the electorate. It would mean the end of corruption forever.