What is proof-of-stake? O All of the answer choices are correct. a way to validate transactions and achieve a distributed consensus a requirement to define an expensive computer calculation, also called mining, that needs to be O performed in order to create a new group of trustless transactions (blocks) on the distributed ledger or blockchain a type of digital currency in which a record of transactions is maintained and new units of currency are generated by the computational solution of mathematical problems; it which operates independently of a central bank