Proof of Activity and Stake

Abstract We proposed a decentralized cryptocurrency protocol named proof of activity and stake in which participants have no admittance threshold and communicate in peer-to-peer network. Our protocol adopts the idea of stakeholders in proof of stake and combined it with the propagation activity to replace the resource-costly proof of work. It is also proposed to solve the contradiction of security and throughput, which discouraged the promotion of blockchain applications. With analysis of security assurance and performance, proof of activity and stake is proved to be robust and economical against double spending attack.