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Today's blockchains suffer from low throughput and high latency, whichimpedes their widespread adoption of more complex applications like smartcontracts. In this paper, we propose a novel paradigm for smart contractexecution. It distinguishes between consensus nodes and execution nodes:different groups of execution nodes can execute transactions in parallel;meanwhile, consensus nodes can asynchronously order transactions and processexecution results. Moreover, it requires no coordination among execution nodesand can effectively prevent livelocks. We show two ways of applying thisparadigm to blockchains. First, we show how we can make Ethereum supportparallel and asynchronous contract execution \emph{without hard-forks}. Then,we propose a new public, permissionless blockchain. Our benchmark shows that,with a fast consensus layer, it can provide a high throughput even for complextransactions like Cryptokitties gene mixing. It can also protect simpletransactions from being starved by complex transactions.

Parallel and Asynchronous Smart Contract Execution