This was spun off from Web of Things where a need was identified to add internal signatures to a WoT Thing Description. Current JSON signature mechanisms, e.g. JWS, are external and "enveloping", and in addition don't support useful features like chaining, partial signing (signing only a subset of the document), or multiple signatures. The short-term goal of this repo is to define an extension that can be used in WoT TDs for signing. The long-term goal is to establish a basis for an enveloped JSON signature standard that can be used for any JSON content.
A rendered version of the current draft can be found here.