Spacemesh is a blockchain-based operating system that is designed to run general-purpose smart contracts at web-scale. The Spacemesh protocol is designed to be highly decentralized, permissionless, and trustless. It is built on top of a novel consensus algorithm called Proof of Space-Time (PoST) that leverages unused storage on a computer's hard drive to secure the network. Spacemesh aims to create a fairer and more secure internet by enabling anyone to participate in the network and earn rewards for contributing storage and processing power.