(13)To prevent greenwashing and to ensure the comparability of information to be included in the crypto-asset white papers and on the websites of crypto-assets service providers, information regarding optional indicators should be subject to the same harmonised rules on the presentation of information and on the methodologies as the information regarding mandatory and supplementary indicators. This applies, for instance, to indirect GHG emissions, such as upstream emissions linked to the equipment purchased by the DLT network nodes or downstream emissions related to waste management.