Blockchain is what is trending right now despite the fact that Government is giving us ash moment but believe me that next more years to come Blockchain will take over everything, industries oil companies and many more, but right now everything seems hard..
Blockchain's a system which doesn't use third parties. This's very different from the traditional system which until now still has a dependency on it. In essence records of transactions that have occurred are stored by many computers scattered on the network itself. So it will be more difficult to hack the system which's on hundreds or thousands of computers, is less likely for all computers to experience interference at the same time.
So, if you pay your donut for example using Ethereum (one of the cryptocurrency), Ethereum for the payment of coffee is transferred from your Ethereum address to your store's Ethereum address in peer-to-peer. And this transaction will be recorded on all computers scattered on the Ethereum network.
At present the government has contributed on the use of the blockchain system, there have even been several which have implemented it into their banking systems.