> For the complete documentation index, see [llms.txt](https://docs.energyweb.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.energyweb.org/energy-solutions/green-proofs-by-energy-web/use-cases-and-reference-implementations.md).

# Use Cases and Reference Implementations

**Building a registry for clean commodity certificates**: Today many commodities—from electricity to liquid fuels, steel or aluminum, or even digital assets—are adopting technologies to reduce their carbon footprint. Commodities that are produced in a sustainable manner can be differentiated from conventionally produced alternatives if they can be digitally tracked throughout their lifecycles.

Green Proofs has been implemented in several of these use cases already:

* [24\*7 Renewable Electricity](/energy-solutions/green-proofs-by-energy-web/use-cases-and-reference-implementations/24x7-renewable-electricity.md)
* [Sustainable aviation fuel](/energy-solutions/green-proofs-by-energy-web/use-cases-and-reference-implementations/sustainable-aviation-fuel.md)
* [Green Proofs for Bitcoin](/energy-solutions/green-proofs-by-energy-web/use-cases-and-reference-implementations/green-proofs-for-bitcoin.md)
* [Sustainable maritime shipping fuels](/energy-solutions/green-proofs-by-energy-web/use-cases-and-reference-implementations/decarbonizing-shipping.md)


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