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 oers good security against possibly practical attacks on Bitcoin, and has a relatively low penalty in terms of network communication and storage space.
['Iddo Bentov', 'Charles Lee', 'Alex Mizrahi', 'Meni Rosenfeld']
Proof of Activity: Extending Bitcoin's Proof of Work via Proof of Stake