DEL is the next-generation blockchain ledger dedicated to solving the current problems of blockchain application landing and value realization. DEL promotes the application landing of global blockchain projects and opens the 4.0 era of blockchain through the provision of comprehensive services such as technology alliance, technology construction, and project incubation in the blockchain application ecosystem. DEL adopts the sharding technology to completely solve the problem of block capacity, and at the same time, builds a Turing-complete blockchain operating system that supports any programming language and any application scenario based on the on-chain container technology.