Imagine a world where the ownership of a house belongs to the one who has the physical possession of the door key. If you lose your key, no locksmith will be able to help you. If someone steals your key, the police and courts will offer no assistance. The thief is now the rightful owner. Welcome to bitcoin! The Bitcoin World can be compared to the Stone Age. Back then property belonged to whoever could physically defend it or successfully hide it. As society evolved we have invented numerous safeguards. Most important is perhaps the notion of private property. Most of us know by instinct the difference between mine and yours and that stealing is wrong. But this is JPJA.NET 44 The Economics of Bitcoin not sufficient. We have police, laws, constitutions, courts, land registers, the eight commandment, and much more to enforce the sacredness of private property. Without these measures people would spend their efforts on a protecting their own values and on stealing