https://guardtime.com/cybersecurity-platform https://eprint.iacr.org/2013/834.pdf
They seem to be used by the GE predix platform and it looks very similar to the concepts in this thread.
https://www.predix.io/services/service.html?id=1881
that looks licensed from Ericsson which licensed Guardtime.. haha
they even go so far as to provide a specialized and hardened hardware device to signing operations at scale.
too bad its proprietary!!
https://guardtime.com/cybersecurity-platform