I noticed that minisketch is using std::uniform_int_distribution and std::random_device... might make sense to do seeding as an input parameter as std::random_device might, on some platforms, give you the same seed for every object made. Then users of the library can use their own high-quality entropy.

Also of note: std::uniform_int_distribution can be platform dependent (in case any tests against vectors or other behavior are supposed to rely on a specific value being generated). May be better to swap it for a custom implementation, or drop it entirely -- it should be possible to directly use e.g. FastRandomContext.rand64() for uniform over 64 bits.