Son: Dad, did you know that there are 1,461,501,637,330,902,918,203,684,832,716,283,019,655,932,542,976 Bitcoin private keys?

Dad: Son, guess which ones are mine. ;-)

Jokes aside.

How likely is it that someone could guess one?

Son: In short, extremely unlikely.

Dad: Extremely unlikely? So, it is possible?!

Son: Extremely unlikely because there are more Bitcoin private keys than atoms in the universe.

Dad: Okay, somehow reassuring.

#Bitcoin