>So, umm, what is blockchain really useful for? At it's core, a blockchain is just a really efficient way of guaranteeing the integrity of any given ledger. I

>So, umm, what is blockchain really useful for? At it's core, a blockchain is just a really efficient way of guaranteeing the integrity of any given ledger. I am working on a giftcard purchasing and issuing system at the moment, for example. I could use a chain of SHA256 hashes of each row hashed upon each previous row of data's SHA256 hash in our MySQL db to make sure that none of my employees were giving themselves an early Christmas bonus if you know what I mean. Nobody could change any of the giftcard values without being noticed. Blockchain technology is not only useful for cryptocurrencies.