A smart contract is an agreement whose execution is automated or semi-automated. DasContract was introduced in 2019–2021 as a domain-specific language for smart-contract modeling, with the ability to generate code in a programming language. DasContract’s former modeling environment had various limitations, both technical and design related. Some of these limitations have previously been recognized in the literature in several dimensions. In this study, we propose further guidelines for contract modeling to address error prevention in the modeling environment, thus contributing to improved smart-contract specifications.