Author: thetaodao_e735fj
Anonymous P2P
Computational Imposters
Sybil Attack
Practical Byzantine Fault Tolerance (PBFT)
Paxos
Byzantine Generals Problem
Client Puzzle Protocol
Hashcash
Hashcash is a Proof of Work based system that was invented by cypherpunk Adam Back in 1997 to reduce email spam and denial of service (DoS) attacks.
Hashcash cannot operate as a full digital currency since it has no way of preventing double spending and the tokens cannot be exchanged among actors.