What a registry is for
A registry is the ledger where Book and Claim happens: where the environmental attributes of sustainable aviation fuel (SAF) are booked, transferred, and retired, under audit. It exists to keep one promise, that each verified reduction is counted once and owned by one party in each scope. Everything else on this page is the machinery behind that promise.
The three ways counting goes wrong
Double counting has three distinct failure modes, and a credible registry designs against each one.
| Failure | What it means | What kills it |
|---|---|---|
| Double issuance | More than one unit issued for the same reduction | Third-party audited registration, plus registry audit |
| Double use | The same unit sold or used more than once | Public retirement statements, plus registry audit |
| Double claiming | Two parties claiming the same reduction in the same scope | Public disclosure of incentives and transparent reporting rules |
One thing is deliberately absent from that list. An airline’s Scope 1 claim and a corporate’s Scope 3 claim from the same batch are different accounting entries for different entities. That is the designed outcome, and the next lesson explains why.
What retirement is
A claim only becomes valid for reporting when the unit is retired and the registry issues a retirement statement. Retirement takes the unit permanently out of circulation: it cannot be transferred or resold afterwards. Statements are published, so anyone can check. The RSB’s public retirement table and the CADO SAF Registry’s public redemptions table are both open to read without a login.
You can find us on both. The RSB table lists the retirement group behind the statement below, naming Delta Air Lines Inc. as the Scope 1 party. The CADO table’s record SAFR-3105888104, dated 10 July 2026, names Future Energy Global Limited as the Scope 3 owner of a voluntary redemption. Parties can choose anonymity on these tables; we choose to be named.
The statement is the product. It is what a buyer’s auditor reads.
Reading a real one
Retirement statement RSB-BCU-RS-26-05-0002 was issued by the RSB Book and Claim Registry on 6 May 2026. It is one page. These are its fields, as printed.
| Field | Value |
|---|---|
| BCU ID | RSB-BCU-SAF-26-04-001-0001 |
| Amount | 36.213 BCUs, where 1 BCU is 1 tonne of neat certified SAF |
| CO2eq reduction | 114.178 tonnes, on a lifecycle basis |
| Scope 1, transport service provider | Delta Air Lines Inc. |
| Scope 3, corporate end-user | Future Energy Capital Limited |
| Sustainability certification | ISCC CORSIA |
| Fossil baseline | 89.00 gCO2eq/MJ |
| GHG lifecycle value | 17.20 gCO2eq/MJ |
| GHG emission reduction | 80.674%, on a lifecycle basis |
| Feedstock and pathway | Technical Corn oil, HEFA, blended in the USA |
| Type of reporting | Voluntary |
| Eligible incentives used | US RFS (RIN) |
Three things worth noticing. The arithmetic is checkable: 1,590,221 MJ of fuel, against an 89.00 baseline, at an 80.674% reduction, gives exactly 114.178 tonnes CO2eq. The incentive field is disclosure working as designed: any national incentive the fuel benefited from must be declared and printed, so nothing is hidden from a buyer’s auditor. And the corporate end-user named is Future Energy Capital Limited, our own legal entity. Before asking any buyer to stand behind a claim, we stood behind one ourselves.
The registries in our world
Our transactions settle on independent registries: the RSB Book and Claim Registry, the Assure SAF Registry, where the ITOCHU transaction at Tokyo Narita was registered, and IATA’s CADO SAF Registry, where we delivered the first transaction, supplying Microsoft. Certification sits underneath them. Future Energy Global is certified as a Book and Claim trader by both RSB and ISCC, issued by SCS Global Services and audited annually.
A retirement statement does not by itself guarantee acceptance under any particular reporting regime, and the RSB says so on the document. What it guarantees is narrower and more valuable: this reduction happened, it belongs to the parties named, and no one else can ever claim it.