Just recently Badge Alliance issued a Companion to the Open Badge Specification to help the general audience in getting to grips with the key technical elements of Open Badges:
“This guide was written for non-technical audiences as a companion to the Open Badges Technical Specification version 1.1. Thanks to IMS Global for arranging contributions. This is an evolving document. Contributions welcome via filing an issue or pull request on the openbadges-specification repository.
Here is the link to the companion: https://openbadgespec.org/faq/