What is the role of public and private keys in blockchain, and how are they used in Java?
Public and private keys are used for encryption and authentication in blockchain. In Java, you can generate these keys using the `KeyPairGenerator` class and perform encryption using `Cipher`.
Thatâ€™s correct. Public and private keys are essential for secure transactions in blockchain networks.
Can you explain how a transaction is signed with a private key and verified using a public key in a blockchain?