Themis is a blockchain-based fair exchange system. It is a public chain that uses a group escrow mechanism to provide decentralized cryptocurrency escrow services. It solves the problem of fair exchange using cryptocurrency as a medium and can be applied to cryptocurrency P2P payments, cryptocurrency OTC exchanges, cryptocurrency e-commerce and other scenarios. Its token Global Escrow Token (GET) will be used to pay for the service fees of the escrow and arbitration peers.