Key Takeaways Petrobras is testing Cardano blockchain tools to track environmental claims tied to sustainable aviation fuel and renewable diesel. The systems are designed to create verifiable records and reduce risks such as double-counting emissions benefits. The projects are still in the research-and-development stage, but show growing corporate interest in blockchain for supply-chain and sustainability reporting. Putting Energy Evidence on Cardano The state-controlled oil company is working with the Cardano Foundation and researchers at PUC-Rio on two applications built on the Cardano blockchain, according to an announcement Wednesday. One project focuses on sustainable aviation fuel, while the other tracks Petrobras’s …