I think you missed my point. It'd be quite hard to build e.g. third-pary petition site on GaurdTime. The other comment's DocuSign suggestion comes closer, but

I think you missed my point. It'd be quite hard to build e.g. third-pary petition site on GaurdTime. The other comment's DocuSign suggestion comes closer, but I also doubt DocuSign offers support for third parties to do micro-signing through an API.