Lifestyle
Brazil's Petrobras tests Cardano blockchain to track claims about cleaner jet fuel and diesel
According to CoinDesk, Brazil's state-owned energy company Petrobras is testing the Cardano blockchain in two research projects: one to stop the same emissions cut from sustainable aviation fuel being counted twice, the other to record the history of its partly renewable Diesel R. Both are still research work, with no timeline for wider use.
About 5 min read
What happened
According to a CoinDesk report dated September 30, 2026, Brazilian state-owned energy company Petrobras is testing the Cardano blockchain in two research projects to track environmental claims related to low-carbon fuels. A blockchain is a shared digital record that many parties can read and add to. The Cardano Foundation announced the projects on Wednesday and shared them with CoinDesk.
According to CoinDesk, Cardano Foundation CEO Frederik Gregaard said Brazil has been one of Cardano's most consistent adopters, citing the government agency SERPRO and SENAI in the industrial sector. He also said Petrobras continues to see value in on-chain provenance and traceability, meaning records of where something came from and where it went, kept on the blockchain.
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What problem each research project addresses
Sustainable aviation fuel: preventing double counting of emissions reductions
According to CoinDesk, sustainable aviation fuel is a lower-carbon alternative to conventional jet fuel that can be used in existing aircraft and airports. Under a so-called book-and-claim model, airlines can buy the environmental benefits of sustainable fuel even if the fuel itself is used elsewhere. This arrangement requires a clear record of who owns each benefit and when it was claimed; otherwise two companies might count the same emissions reduction. The report says the application uses Cardano to record the source, recipient and claim time of each benefit.
The report also describes a practical scenario: a passenger enters departure and destination airports, calculates the corresponding fuel benefit, and receives a certificate that can be linked back to the original fuel certificate.
Diesel R: recording the fuel's journey from production to use
According to CoinDesk, Diesel R is Petrobras diesel made partly from renewable feedstocks such as vegetable oils or animal fats. The project would record information at the production, transport and usage stages, linking them into a history of the fuel's flow. This could help companies report Scope 3 emissions, the indirect emissions from suppliers and customers, data that is often held by other companies. The report says this diesel model is still "proposed".
| Project | Target fuel | Main purpose | Current status (per CoinDesk) |
|---|---|---|---|
| Aviation fuel project | Sustainable aviation fuel | Record benefit source, recipient and claim time to prevent double counting of emissions reductions | Research stage; fuel volumes and timeline not disclosed |
| Diesel project | Diesel R (diesel made partly from renewable feedstocks) | Record production, transport and usage history to support Scope 3 emissions reporting | Proposed research model; fuel volumes and timeline not disclosed |
What it means for everyday readers
The point of this news is not cryptocurrency itself, but using a blockchain as a shared record to tackle whether green claims can be trusted. If such systems are eventually deployed, companies reporting emissions cuts and passengers checking the low-carbon fuel benefits allocated to their flights could have clearer, traceable proof. However, according to CoinDesk, both projects are still at the research stage, with no disclosure of when or at what scale they will launch, so ordinary consumers may not encounter them directly in the near term.
CoinDesk also noted that Cardano joined x402 this month, a payment standard that lets apps and AI agents pay on demand for data or computing services. However, its initial payment-processing software has only been tested on a pre-production network, a testing version of the blockchain used before going live, and commercial use on the live blockchain has yet to be proven.
Frequently asked questions
Is Petrobras already running a fuel-tracking system on Cardano in production?
No. According to CoinDesk, both projects are still at the research stage, the diesel model is described as proposed, and the announcement did not disclose fuel volumes covered or a timeline for wider use.
What is book-and-claim?
According to CoinDesk, it is a model that lets airlines buy the environmental benefits of sustainable fuel even if the fuel itself is used elsewhere. It requires recording who owns each benefit and when it was claimed, so that the same emissions reduction is not double counted by two companies.
What are Scope 3 emissions?
According to CoinDesk, Scope 3 emissions are a company's indirect emissions from its suppliers and customers. The data needed is often held by other companies, so a shared record across companies may help with reporting.
Where does this news come from?
The projects were announced by the Cardano Foundation, which shared them with CoinDesk. Everything in this article comes from that single CoinDesk report.
Does this mean I should buy related crypto assets?
No. This article is not investment advice; it only explains technology adoption news and does not discuss prices or trading.
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