This study examines how sustainable mergers and acquisitions (M&A) practices influence public opinions, focusing on targets with higher ESG ratings. Blockchain technology is used as a moderating variable in the link between sustainable M&A practices and market perceptions. Improving transparency, immutability, and security during the M&A process, thanks to blockchain technology, allows the ESG performance of the target company to be evaluated and sustainability gains to be tracked after the transaction. This research is unique in that, for the first time, it investigates the crucial role this new and disruptive technology can play during sustainable M&A transactions. The findings will provide clear insights into the synergy between ESG, blockchain, and enterprise market value in sustainable M&A transactions, with relevant theoretical and practical implications, paving the way for further multidisciplinary and longitudinal studies in this field.