Proof of Space

A consensus/Sybil-resistance mechanism where participants dedicate disk storage (rather than energy as in proof of work, or capital as in proof of stake) to secure the network — the basis of chains like Chia, often combined with a time element (proof of space-and-time). It aims to be greener than proof of work, but has its own hardware and centralisation dynamics. One of several alternative consensus mechanisms beyond PoW/PoS.