Petrobras, Brazil’s state-controlled oil and energy company, is testing the Cardano blockchain in two research projects designed to improve the traceability of lower-carbon fuels and their environmental claims.
The work covers sustainable aviation fuel, or SAF, and Diesel R, Petrobras’ diesel made partly from renewable materials including vegetable oils and animal fats. According to CoinDesk, the Cardano Foundation announced the projects on Wednesday and shared details with the publication.
Both initiatives are still at the research stage. The announcement did not specify how much fuel would be covered or provide a timetable for wider commercial deployment.
Preventing double counting in aviation fuel claims
The SAF project focuses on a central challenge in the market for environmental attributes: ensuring that the same emissions reduction is not claimed by more than one company.
SAF is a lower-carbon alternative to conventional jet fuel that can be used with existing aircraft and airport infrastructure. In some arrangements, airlines can pay for the environmental benefit associated with sustainable fuel even when the physical fuel is consumed somewhere else. This approach is commonly known as “book-and-claim.”
Because the physical fuel and the environmental benefit may be separated, the system depends on reliable records showing who owns a benefit and whether it has already been used. Petrobras’ proposed application would use Cardano to register the origin of each benefit, the party that received it and the point at which it was claimed.
The model could also connect an individual allocation to the underlying fuel certificate. In the example described in the announcement, a passenger would enter departure and arrival airports, calculate the relevant fuel benefit and receive a certificate tied back to the original certificate for the fuel.
The intended result is a clearer chain of ownership for environmental claims and a mechanism to reduce the risk of double counting. The project, however, remains a test rather than a confirmed production system.
Creating a record for Diesel R
The second project concerns Diesel R, Petrobras’ partly renewable diesel. Rather than concentrating primarily on ownership of an environmental benefit, this model would build a history of the fuel itself.
The proposed system would collect information at different points in the fuel’s lifecycle, including production, transportation and use. Those records would then be joined into a traceable history, allowing participants to follow the product from its origin through later stages.
That information could support corporate emissions reporting, particularly for Scope 3 emissions. Scope 3 covers indirect emissions connected to a company’s suppliers and customers. Data relevant to those emissions is often held by other businesses, making the preparation of comprehensive reports more difficult.
A shared record of fuel movements and use could give companies a more consistent source of information for those reports. The Diesel R model is described as proposed, and there is no disclosed schedule for a broader rollout.
Cardano’s enterprise push
The tests add Petrobras, one of the region’s largest companies, to a series of Brazilian institutional and industrial connections cited by the Cardano Foundation. Frederik Gregaard, the foundation’s chief executive, said Brazil had been a consistent adopter of Cardano, pointing to government technology provider SERPRO and industrial organization SENAI as examples.
Gregaard also referred to recent developments around Cardano, including its participation in x402 and support for Cardano Native Tokens from Fireblocks. x402 is a payment standard designed to allow applications and artificial-intelligence agents to pay for data or computing services when they request them.
Cardano’s initial x402 payment-processing software had been tested on the network’s pre-production environment. Commercial use on the live blockchain had not yet been demonstrated, according to the source material.
The Petrobras projects therefore represent research into blockchain-based provenance and traceability, not a completed fuel-market deployment. Their significance will depend on whether the proposed records can be integrated into real operating and reporting processes, but the announcement shows how blockchain technology is being tested for tracking environmental claims as well as digital payments.
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