Pretty sure Paxos is easily extended to the byzantine setting with digital signatures (i.e. Byzantine Paxos has also been around forever). Also PBFT has been ar

Pretty sure Paxos is easily extended to the byzantine setting with digital signatures (i.e. Byzantine Paxos has also been around forever). Also PBFT has been around since the 1980s. Only distinction is classical consensus is permissioned whereas blockchains are typically permissionless.