Complex supply networks feature many inter-connected and geographically distributed partners. Many of these partners are beyond the direct realm of the company, making the management of sustainability a difficult task. Inevitably, this research aims to explore how blockchain technology can facilitate sustainability initiatives across multi-tier supply networks. The findings suggest that blockchain can enhance the visibility of suppliers’ sustainability practices. Managers will have increased transparency and traceability of their multi-tier supply networks, which will eventually reduce the cost of monitoring a large number of geographically distributed suppliers. Furthermore, information can be shared with different stakeholders to increase credibility and legitimacy.