In the gold market, how would you know if someone gave you a pure bar of gold? Well, you can own an XRF (X-ray Fluorescence) device that emits energy waves into the metal to determine the elemental composition based on the frequency of energy that comes back to the device. In short, a purity audit ensures that you have purchased actual gold. Why is this device so important – because if you buy a million dollars of gold, you want to make sure it’s the real stuff, right? In Bitcoin, that purity test is conducted by running a full node. This test can be outsourced to a third party, or it can be conducted by the individual. This point is vital: if a person is NOT allowed to run their own node and audit delivery, it would be the same as saying a person accepting delivery of a billion dollars in gold is banned from conducting their own personal audit.