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The most attractive part about blockchain is the decentralized ledger showing each transaction made.
I feel like greater minds than mine could come up with a way to use that to fight government corruption. Every transaction is a matter of public record.
I doubt it's really a practical solution though. Each transaction makes each subsequent transaction more computationally expensive. Plus all these vendors and contractors and everything are accustomed to fiat currency. Likely, they'd just immediately exchange it for cash.
This of course doesn't tackle the issue of under-the-table corruption where you invite a senator out for lunch and kickbacks. I'm also sure that the government would want to maintain their own ledger, or that conniving people will find a way to cook the books anyway.
This is probably the key thing. Let's say that you wanted to purchase a home in Turkey but you live in Canada (just play along). A transaction on the blockchain can show a verified transfer of funds, record the purchase and act as proof of ownership.
As you mentioned, the big issue is computational expense.
But is this actually a problem. Does people go around now and need proof that they bought some property?
To me it seems like blockchain is a solution looking for problems that doesn’t really exist.
Yeah, all the time, obviously. That's literally what a receipt is. If people did not need to prove that they owned things, then receipts, titles and deeds wouldn't exist.