Hassan Maishera
TL;DR
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Petrobras is testing Cardano in two research projects focused on lower-carbon fuels.
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The aviation project records ownership and use of sustainable fuel benefits to help prevent double counting.
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Passengers could receive certificates linking their allocated benefit to an original fuel certificate.
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A proposed Diesel R application would track fuel through production, transportation, and use.
Petrobras, Brazil’s state-controlled energy company, is exploring how Cardano can help track environmental claims associated with lower-carbon fuels.
Two research projects announced Wednesday by the Cardano Foundation focus on sustainable aviation fuel and Diesel R, Petrobras’ diesel made partly from renewable materials.
Today, we announce two new initiatives with @Petrobras.
— Cardano Foundation (@Cardano_CF) September 30, 2026
As part of an ongoing R&D collaboration with Petrobras and PUC-Rio, the teams have delivered two blockchain applications focused on sustainable aviation fuel and Diesel R, Petrobras' brand of renewable fuel.
The work adds…
The initiatives address different recordkeeping challenges: documenting who can claim a fuel’s environmental benefit and connecting information across its physical supply chain.
Both remain research projects. The announcement did not disclose the volumes of fuel involved or establish a schedule for wider use.
Aviation Project Separates Fuel From Its Environmental Benefit
The aviation initiative focuses on sustainable aviation fuel, a lower-carbon alternative to conventional jet fuel that can be used in existing aircraft and airport infrastructure.
Its central challenge concerns a system known as book-and-claim. Under that model, an airline can purchase the environmental benefit associated with sustainable fuel even when the physical fuel is consumed elsewhere.
Separating the benefit from the fuel can make participation possible without requiring every buyer to receive a particular shipment. However, it creates a need for clear records of ownership and use.
Without those records, more than one company could claim the same emissions reduction.
Petrobras’ application uses Cardano to document where a benefit originated, who received it, and when it was claimed. The intended result is a traceable record that helps prevent duplicate claims.
The aviation application also includes a passenger-facing process. A traveler can enter departure and destination airports, calculate the corresponding fuel benefit, and receive a certificate documenting their allocation.
That certificate links the passenger’s allocation to the original fuel certificate, establishing a record connecting the individual claim with its source.
The blockchain’s role is to preserve those relationships and claim events. It supports traceability, while the underlying fuel information remains essential to establishing what the certificate represents.
The project therefore centers on tracking environmental attributes rather than requiring the associated fuel to be used on the passenger’s specific flight.
Diesel R Research Tracks the Fuel’s Physical Journey
The second initiative concerns Diesel R, which Petrobras produces partly from renewable inputs such as vegetable oils or animal fats.
The proposed application would record information at successive stages of production, transportation, and use. Those entries would be joined into a history of the fuel’s journey.
That approach could help businesses assemble information for Scope 3 emissions reporting, which covers indirect emissions across suppliers and customers.
Such reporting often requires data held by multiple organizations. Connecting records across the supply chain could make that information easier to trace and reconcile.
The diesel model is still described as proposed, so its potential reporting benefits have yet to be demonstrated through a disclosed broader deployment.
Cardano Foundation Highlights Brazilian Enterprise Interest
Cardano Foundation CEO Frederik Gregaard described Petrobras’ research as another example of Brazilian organizations exploring Cardano.
He pointed to SERPRO in government and SENAI in industry as other adopters, and said institutional interest in provenance and traceability continues to grow.
Gregaard also cited Cardano’s addition to the x402 payment standard and Fireblocks’ support for Cardano Native Tokens as developments relevant to enterprises.
Those initiatives are separate from the Petrobras fuel projects. Cardano’s initial x402 payment-processing software was tested on its pre-production network, with commercial use on the live blockchain still to be demonstrated.
Petrobras’ work offers concrete examples of how blockchain records could support fuel-benefit accounting and supply-chain reporting.
However, the announcement provides no fuel-volume figures or timetable for expansion. The next practical question is whether the research can produce reliable records across participating organizations and support use beyond the initial applications.
