Low Carbon Blockchain: the project “Bas Carbone Blockchain” (BCB) aims to offer a free application for any type of smartphone that offers an innovative process with a high impact on the environment, aiming to: to help reduce direct and direct CO2 emissions on a daily basis; optimising ecological taxation and certain compensation mechanisms; generate revenue for users who will save CO2. The application gathers different information related to low-carbon impacts from our mobility, all implemented through blockchain technology