The blockchain technology would be the solution to avoid electoral fraud?

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Yes, definitely.

Election systems on most countries nowadays still rely on centralized servers to store election data which are vulnerable to third-party hacking or even worse being hacked by the current government. Blockchain technology can provide a tamper-proof election database so one individual can't vote more than once (or other security measures on other voting systems).

There are problems that can come by implementation of blockchain technology though. Below are the ones that comes on top of my head:

• Average people may not be able to keep their private key for voting secure enough and their key(s) get compromised.
• Some people may choose to sell their voting right by giving their voting key to third party.
• If the blockchain records are public then everyone will know who votes for who which may cause divisiveness between people. If the records are private (like Monero for example), general public won't trust the system as the origin of the votes can never be verified.
• Most government and political party are corrupted. They won't let a tamper-proof system become the standard so easily.

Blockchain technology is still extremely new. I believe it will be able to solve fraud problems on election systems but I think we still need to think of more perfect designs before we implement it on real-world election because it is something vital.