Besides the Open Footprint Standard, the forum has created other documentation, including a whitepaper, business guide, and JSON schemas. Direct links to these are provided below.
THE OPEN FOOTPRINT® BUSINESS GUIDE
Whitepaper: OPEN FOOTPRINT™ FORUM OVERVIEW: ENABLING EFFECTIVE EMISSIONS DATA MANAGEMENT AND SHARING
JSON Schemas for the Open Footprint Standard, Edition 1: (https://publications.opengroup.org/i267s)