Intel retrieved within the last Tessera. The Tethered Hand is Copperplate, also known as Wendy/ADA from the Nemesis universe.
Personally, that's really surprising to me. I'd never have thought that Wendy of all people might be behind the Hand, even more so that the Hand is actually part of Nemesis.
@Truthseeker, you have met Wendy in person multiple times. Assuming you didn't knew the identity beforehand, are you as surprised as we are that it's Wendy? You should have a good grasp at her behavior.