I don't have this, but I am in need of reworking how signing works in gossip. Right now I cannot async/await any kind of signing process because it trips a rust compiler lifetime bug (about '0 and '_ being different)... I can't find a link to the bug, it was in the 101xxx region. Oh well...

I may need to write a synchronous signer process that communicates remotely but blocks (to a stdio subprocess, or to a remote bunker), and have it send messages to/from the main code instead of being called/awaited upon directly.