Proof of Activity
Iddo Bentov, Charles Lee, Alex Mizrahi, Meni Rosenfeld · ACM SIGMETRICS Performance Evaluation Review · 2014
We propose a new protocol for a cryptocurrency, that builds upon the Bitcoin protocol by combining its Proof of Work component with a Proof of Stake type of system. Our Proof of Activity protocol offers good security against possibly practical attacks on Bitcoin, and has a relatively low penalty in terms of network communication and storage space.