This paper seeks to answer whether the use of blockchain technology enhances sustainability in supply chains during e-procurement. This paper takes the issue from a legal perspective and discusses whether the benefits of public e-procurement may constitute possible means to enhance sustainability with the use of blockchain technology. It investigates blockchain technology and its features to improve data protection and transparency in the area of public procurement. It further addresses whether States have the obligation to ensure sustainability in their public e-procurement processes, whilst maintaining data protection and confidentiality. The paper is based on a survey of primary sources of law, best practice and available literature, adopting the legal analytical method. The paper is limited to suggesting the use of blockchain technology to disclose history and processes of suppliers to ensure their alignment with sustainability. It does not attempt to include identified States, rather it adopts a wholistic approach to the issue.