Blockchain is used in cryptocurrencies to have a shared registry modified and verified by independent nodes who don't trust each other. Using it, you can prove

Blockchain is used in cryptocurrencies to have a shared registry modified and verified by independent nodes who don't trust each other. Using it, you can prove to anyone that you have X bitcoins, and anyone who received them from you can prove this too. In case of voting, there are no independent nodes, all modifications to the registry are done by the election committee (or authorised by them) and users can only verify the transaction list. So it would be easier to just present election events as a Merkle tree (voter X has submitted an encrypted ballot Y, and the hash of the registry before this was Z). But in this case there would be no "blockchain" and no feeling of reliability and security. If I made a mistake here, I would be happy if someone would point at it.