[sireat]

I am surprised a workable IPv4 based POS coin has not been produced. The consensus protocols are already using IPv4

That is one IPv4 address -> one unit of vote

Difficulty adjusts based on how many IPv4 addresses participate

Sure, it gives advantage to Apple, MIT or anyone with /8 block and disadvantages citizens from some countries with very small allocations but otherwise it could be scaled to whole world while staying truly green.

I suppose the hard part is figuring out the stake when multiple people on the same IP address want to participate.