what are the technical requirements to run a znode, like bandwidth, storage, uptime, cpu, etc?.
We still don't know yet. Only thing we know is Znodes should take 5-6 to be implemented (I would personally expect 2 months) and that they will be in the low thousands/ high hundreds range, all of this according to the latest update on Youtube, which can be found here:
https://www.youtube.com/watch?v=BkTWTDKVIQo