Nerthus is a universal contract programming platform based on DAG technology and a distributed blockchain operating system,which will effectively solve the problem of the traditional blockchain system with low throughput transaction confirmation delay, block expansion and so on.Nerthus has its own Turing-complete programming language, Witstone, and the runtime environment OVM and Nerthus is also compatible with Go and Ethereum's Solidity,so that developers can write Nerthus smart contracts in a short period of time to construct and define their own features, develop their own applications and blockchain systems, and publish their own tokens. In addition,Nerthus has designed an out-of-chain data validation/confirmation/consensus mechanism, promoting the popularization and application of smart contracts in the real world.