4AIR creates registry for SAF tracing and documentation

4AIR has created its Assure SAF Registry, which it described as a “blockchain-based web registry designed to document, trace and account for the sustainability attributes of sustainable aviation fuel (SAF)”. The registry is to help account for SAF, which 4AIR said is “co-mingled in airport pipelines or fuel farms under mass balance or book and claim chains of custody, making it laborious to document.” But the registry “provides complete transparency about the type of SAF purchased, the feedstock used, the blend of the fuel, and any sustainability certifications earned or regulatory programs for which the fuel may be eligible,” 4AIR