Petrobras tests Cardano blockchain to trace low-carbon fuel claims

What happened

Petrobras, Brazil's state-owned energy company, is testing Cardano's blockchain to track the environmental benefits of renewable fuels. The company is working with the Cardano Foundation and researchers at PUC-Rio on two applications built on Cardano. One project covers sustainable aviation fuel, while the other tracks Petrobras's renewable diesel product, Diesel R.

For sustainable aviation fuel, the project uses a book-and-claim system, which lets the environmental benefit tied to a quantity of cleaner fuel be assigned separately from the physical fuel. Cardano records each benefit's origin, recipient and claim time on its blockchain to help prevent the same benefit being counted twice. Airlines can claim verified benefits even when the SAF is used outside their own operations. Passengers who enter their departure and destination airports can receive a digital record tied to an allocation of the fuel.

The second project applies similar technology to Diesel R, a blend of renewable material and conventional diesel that Petrobras makes from feedstocks including vegetable oils and animal fats. Digital checkpoints follow the fuel through production, transportation and use, building a continuous record of its lifecycle. The developers say the record can support reporting of Scope 3 emissions, the indirect greenhouse-gas emissions generated across a company's supply chain.

Both projects remain part of an ongoing research-and-development collaboration rather than a broad commercial rollout. "The energy transition will depend as much on trust as it does on new fuels," said Rafael Fraga, the Cardano Foundation's business development lead for Latin America.

Why it matters

The Petrobras work reflects a broader effort by companies to use blockchain systems for record-keeping beyond cryptocurrencies, especially in supply chains where information is spread among producers, transportation companies and customers. A shared, verifiable record can help companies substantiate emissions claims that cross organizational boundaries.

For Petrobras, the experiments place blockchain alongside renewable fuels in a wider effort to document and substantiate claims tied to the energy transition. Fraga framed trust as central to that shift, saying it will matter as much as new fuels.

Background

The Cardano announcement came one day after CSD BR, a Brazilian financial market infrastructure firm, said it would begin mirroring records for shares of BTG Pactual investment funds on the XRP Ledger. CSD BR said it has more than $4.2 trillion (22 trillion reais) in registered assets, will keep the legally authoritative records in its existing systems and will treat the blockchain as an additional layer for verification and auditing.

What is still unclear

• There is no announced date for a commercial launch. Both projects are still in the research phase.
• It is not yet clear whether the two applications will move beyond research and development. Both remain part of an ongoing research-and-development collaboration rather than a broad commercial rollout.

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