Petrobras develops two Cardano applications to track renewable fuel claims

Brazilian state-controlled oil company Petrobras has developed two Cardano-based applications to track sustainability data for sustainable aviation fuel (SAF) and its Diesel R renewable diesel. The Cardano Foundation announced the applications on Wednesday. Petrobras developed the first application with PUC-Rio's Ledger Labs. The application turns environmental attributes associated with SAF into digital tokens designed to prevent the same claim from being used more than once. Its Book-and-Claim model separates the environmental benefit from the physical fuel, allowing an airline, company or passenger to claim the benefit even if the SAF is used elsewhere. The tokens, called CS-SAF, contain metadata aligned with the Carbon Offsetting and Reduction Scheme for International Aviation. Passengers can claim CS-SAF tokens through an application and receive a certificate tied to their journey and environmental claim. The second application creates digital checkpoints for the production, transportation and use of Diesel R. The Cardano Foundation said the Diesel R data could support Scope 3 reporting of indirect emissions across a company's value chain. The applications are part of a research and development collaboration that began in 2023 with blockchain education for Petrobras employees. The collaboration expanded in 2025 to energy-sector research with PUC-Rio's Ledger Labs. The Cardano Foundation disclosed neither the fuel volumes covered by the applications nor a timeline for broader deployment. Shell also uses blockchain through Avelia, a Book-and-Claim platform launched in 2022 to track SAF environmental claims and prevent double counting. In a September update, Shell said Avelia had contributed to more than 84 million gallons of SAF entering the global fuel network since its 2022 launch. Shell said that activity resulted in more than 780,000 tonnes of CO₂e abatement through June 2026. Australia's Viva Energy signed an agreement with NoviqTech in January to research digital Book-and-Claim systems for SAF, including blockchain's potential use in emissions reporting and tracking environmental claims.