Mining is a funny term. You’re not really “mining” bitcoin in fact. Bitcoin (and other cryptocurrencies) depend on a technology called Blockchain. Blockchain allows for a public ledger of transactions which can be secure and safe from hacking. Miners are simply people or businesses who contribute the processing power of computers on the blockchain network, generally by way of a mining pool.?? This compute power could be CPU, GPU, FPGA, or ASIC based. Indeed in the past of Bitcoin, mining was exclusively CPU based with GPUs following much less far behind. In those early days it was even possible to mine Bitcoins with computers as small as a Raspberry Pi. As the network grew and also the difficulty rose, miners quickly gone to live in mining Bitcoin having a GPU.