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Did anyone think of blockchain for a voting system ? I had a feeling it would be useful in this scenario as anyone could actually check it's own vote and the outcome. However reading comments here I may be delusionnal in regards to the requirements of such technology.

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Typically you want votes to be non-identifiable so you can't show that Person A voted for Candidate 1.

This is why your mail in ballots in the US have the double envelope system. The outer envelope identifies the ballot (but not your vote) and if there's only 1 submission then it's likely legit. At that point the inner ballot can be counted along with other legit ballots and it won't be identifiable back to you.

The biggest problem with anything blockchain relating to the real world is the oracle problem. The benefits that blockchain offers are only applicable to things that exist on the blockchain, and people don't exist on the blockchain.

https://chain.link/education-hub/oracle-problem

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