Already, we can say that the appearance of crypto-currencies has brought about revolutionary changes in people's lives.
That's for sure, the main feature of the blockchain network is the irreversibility of the operations performed. None of the participants has the right to correct the information in the blocks or to cancel the transactions, provided that the latter have been confirmed.
Information about operations, accounts, users are not available to a wide range of people, this is also an important aspect.
It is almost impossible to hack the system, as each unit is securely protected with a cryptographic key. Only the owner of the latter can transfer the cryptu to the address chosen by him.