Cryptocurrencies are becoming increasingly popular as a means of investment and payment, with Bitcoin and Ethereum being among the most well-known examples. However, the underlying technology that makes these cryptocurrencies possible, known as blockchain, has also given rise to a new set of terms and concepts, including "Layer 0," "Layer 1," and "Layer 2." At the most basic level, Layer 0 refers to the physical infrastructure on which cryptocurrencies operate, including the hardware and netw...