I've yet to find one. Here's what Nick Szabo has to say about it https://twitter.com/NickSzabo4/status/943919997067264000 https://twitter.com/NickSzabo4/status/

I've yet to find one. Here's what Nick Szabo has to say about it https://twitter.com/NickSzabo4/status/943919997067264000 https://twitter.com/NickSzabo4/status/943919997067264000