The first problem that cryptocurrency solves is, how can to securely make transactions without giving away our secrets such as critical account numbers. It accomplishes this using cryptographic signatures.
Other systems that do not use cryptography and instead often rely on trust in exchanging critical secrets, such as how the banking system generally works, are outdated.
Other systems that do not use cryptography and instead often rely on trust in exchanging critical secrets, such as how the banking system generally works, are outdated.