+30 Million publickeys in a 4mb file, is that okay? for a database, or is there something better.
No its not possible, that is only a 1.39 bits per key, i doubt that exists some Datastructure that support such compresion for search or for store.
That's because you don't know how, if you want to bet on it, you transfer the money to an admin and I publish it, if you check it and it's true admin sends me the money, if it's false admin returns the money to you and you ridicule me.
nothing is impossible, there is only ignorance