Abstract: To prevent the systemic risks brought by financial technology innovation,regulators have put forward more and more regulatory requirements,which increases the compliance costs of financial institutions and regulatory frictions.Blockchain technology can help to promote RegTech innovation and build a new regulatory scheme,but how to realize the digitalization of regulatory rules on the blockchain is still an urgent problem.In response to the core requirements of RegTech,this paper proposes a regulatory-oriented smart contract programming language RegLang,which is interactivity,calculability and concurrency.The language is convenient for regulatory experts to write regulatory policies into digital rules and run them in the form of smart contracts on the blockchain.We evaluate RegLang based on the digitization of real-world financial regulatory policy,and the results show that compared with existing programming languages,RegLang is easy to write,expressive,highly readable,supports concurrent operation,and is more suitable for expressing regulatory rules on blockchain and realizing blockchain-based digital regulation.

Key words: Blockchain, Programming language, Regulatory technology, Smart contract