Yeah that book cinched it for me that he was guilty . Just the title I didn ' t do it , but here ' s how I would have who the fuck would write some shit like that ? <| sep |> easy as in imagine all the grains in the universe are of unique size , some of nano size , some bigger than Jupiter , and all other in between . You have to find one specific grain to steal my money , using its diameter as its key . Yes , you can , there is chance , but the time it will take you to travel all around in universe and measuring each grain will be trillions of year . That is the number of unique bitcoin addresses , and its size is like its private key . Ofcourse if i give you the exact location of my grain , you will get it in seconds . That is equivalent of me giving you my private keys , or just keeping it in open public view . And yes , instead of savingrecording the diameter of my grain in common units of measurement like inches or metres , I could convert it to a unit which totally exists in my head , and then each time you see a grain , you have to run all calculations for the time of another trillion years . That is BIP 38 passphrase encryption .