Blockchains and the blockchain technology are valuable because it is a secure ledger for transactions across the chain. It could revolutionize the banking industry if they were to begin adopting it.
Right now banks use a centralized system that have to deal with hacking attempts frequently.
As people transact in a Blockchain ecosystem, a public record of all transactions is automatically created. Computers verify each transaction with sophisticated algorithms to confirm the transfer of value and create a historical ledger of all activity. The computers that form the network that are processing the transactions are located throughout the world and importantly are not owned or controlled by any single entity. The process is real-time, and much more secure than relying on a central authority to verify a transaction.
For the blockchain to be hacked and the ledger disrupted, every computer around the world that is verifying transactions will have to be hacked at the exacted same time with the exact same information.
The blockchain is a lot more of secure way to process transactions and to keep records.
How does that create value?