I remember first seeing such a proof-of-work in the network protocol layer of the game Tribes 2. They opened up the source code for that, named OpenTNL (seems a

I remember first seeing such a proof-of-work in the network protocol layer of the game Tribes 2. They opened up the source code for that, named OpenTNL (seems abandoned now) where you could see how it's done. Here's the part that verifies a puzzle: https://github.com/kocubinski/opentnl/blob/master/tnl/clientPuzzle.cpp#L107 https://github.com/kocubinski/opentnl/blob/master/tnl/client...