well, i'm just a novice, longway; but, i think you're confusing block chain's use in bitcoin/crypto curriences and its wider use:
https://www.cio.com/article/3194586/...nsactions.html
Cryptography secures the records in a blockchain transaction, and each transaction is tied (in the chain) to previous transactions or records. In addition, the transaction records are distributed among and viewable by all participants of a blockchain distributed ledger. An attempt to tamper with the data would require that the hacker also change all the previous records in the blockchain.
Moreover, blockchain transactions are validated by algorithms on the nodes (computers in the network of participants in the distributed ledger). A single entity cannot create a transaction. Finally, blockchains provide transparency, giving each participant the ability to monitor the transactions at any time.
Participants can opt to set up a private or public blockchain.
A private blockchain limits the number of participants that are verified and trusted.
Quite frankly, aside from someone cracking the cryptology, blockchain is one of the most secure digital capabilities available.
https://www.cio.com/article/3194586/...nsactions.html
Here are some of the most notable entities that have examined blockchain and are now moving to adopt it.