Blockchain technology is a wonderful thing for transparency, immutability and accuracy of a ledger. The record of previous transactions. Something not in place with banks.
The advantages of this ledger system is it counters covert fraud and mismanagement of funds. Open publication of financial transactions removes the ability to move funds and have this movement unseen by the population. Individuals can monitor the blockchain and notify appropriate authority of suspicious transactions.
This record of transaction cannot be changed in a decentralised blockchain. It can only be changed in a centralized, private ledger.