Book and Claim
In the Book and Claim chain of custody model, the environmental attributes—such as the low-carbon fuel's emission profile—are decoupled from the physical delivery of the fuel. This enables emissions reductions to be allocated to a similar supply chain, even if the fuel switch occurs elsewhere.
Unlike traditional chain of custody models, which require a physical and administrative link, Book and Claim allows for the independent tracking, documentation, and transfer of environmental attributes.
As a result, emissions reductions can be allocated to logistics providers (Scope 1 emissions) and/or cargo owners (Scope 3 emissions), even when the fuel switch is performed by carriers outside of their direct supply chain. Crucially, each reduction is only allocated and claimed once—a process CarbonLeap safeguards through its verification partners.
To ensure credibility, CarbonLeap aligns the supply chain of the claimant with that of the intervention, for example by matching transport modality. Additional attributes—such as geography, feedstock, and vehicle type—can also be specified to further mirror the claimant’s operations. Selecting the right insetting solution requires strategic expertise—something CarbonLeap provides through end-to-end support.
This innovative approach is especially relevant in today's climate landscape, where companies aim to reduce their carbon footprint but struggle to act. Common challenges include:
- Sustainability is often used as a profit model, inflating costs across the supply chain.
- Fragmented subcontractor networks hinder coordinated decarbonization.
- Many companies lack the knowledge, resources, or tools to implement reductions effectively.
CarbonLeap leverages the Book and Claim model to overcome these barriers—giving companies real control over their decarbonization strategy and helping them turn ambition into measurable, verified action.

