Try to imagine you are building a new banking system, and you want it to be secure.
How would you
A) allow for secure payments without giving away something like a bank account # or debit card number
and
B) ensure that, even if those payments were secure, there was no other cheating, such as people at a bank just deciding to initiate an account with one million?
Generally speaking the way to handle those requirements is by employing cryptographic signatures and public blockchain(s), and the result is usually referred to as a cryptocurrency.
How would you
A) allow for secure payments without giving away something like a bank account # or debit card number
and
B) ensure that, even if those payments were secure, there was no other cheating, such as people at a bank just deciding to initiate an account with one million?
Generally speaking the way to handle those requirements is by employing cryptographic signatures and public blockchain(s), and the result is usually referred to as a cryptocurrency.