Double Spending

Double spending is the act of spending the same cryptocurrency units twice. This is a potential problem because digital currency transactions can be duplicated, unlike the physical currency, which can only be transferred from one person to another. Here's an example of how double spending might work: Alice has 10 units of cryptocurrency. So Alice sends 5 cryptocurrency units to Bob to buy a product from Bob's online store. Before Bob can confirm that he has received the payment, Alice…