This page outlines item 2 ("Develop a consistent way to capture existing certifications as a transaction in any of the Hyperledger blockchain frameworks") of the scope of the Hyperledger CA2SIG Standards Working Group.
1. Accounting frameworks
Greenhouse Gas Protocol
ISO 14068:2018
Reference: https://www.iso.org/obp/ui/#iso:std:iso:14080:ed-1:v1:en
"The framework in this document provides guidance to countries and other interested parties on a consistent, comparable and transparent approach to selecting, proposing, using, revising and maintaining methodologies on climate action"
Differentiates between methodologies, policies and measures.