18 January 2023 (Lloyd's List) - A GUARANTEE of origin scheme using blockchain and a method called physical marking can help trace carbon intensity of alternative marine fuels. A report by Lloyd’s Register proposes adoption of a guarantee of origin mechanism using blockchain technology to measure lifecycle emissions of alternative fuels such as green ammonia and green hydrogen, adding it would provide transparency to shipowners and help avoid double counting or mislabelling. Lifecycle assessments to verify alternative fuels’ greenhouse gas emissions, or the so-called well-to-wake measurements, is one of the key discussions around the shipping industry’s net zero targets. Another suggested method is physical marking, which requires adding a marker to the alternative fuel to verify its lifecycle emissions. This method is used in liquefied petroleum gas and ammonia’s similarity to this product could suggest it is a viable solution, according to the report. It mentions Australia-based Tymlez Group and Authentix, two technology providers with alternative solutions to the well-to-wake issue. Tymlez offers a blockchain enabled guarantee of origin platform, while Authentix is a provider of the marking method. Both methods require further testing and to build confidence in them, the report suggests measures such as trials or pilot studies in potential green shipping corridors.