Can blockchain transaction be made real time ?

Let me explain myself a bit ;)

I am new around blockchain biz but not in tech. Somehow I missed the bus so far.

So what I gather is a transaction is sent out and whoever gets there first creates a recorded block for good to seal the transaction and this process can take anywhere from few seconds to 10 mins. Please correct me if I am wrong. I am mostly from web / app world so I am trying to figure out how such a delayed transaction recording mechanism be useful for say user authentication during a login process.

Am I missing something.



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