Ethereum Classic functions on a proof-of-work (PoW) consensus algorithm akin to Bitcoin. Like Ethereum and its native unit ETH, Ethereum Classic users pay fees in ETC to execute smart contracts, and you can think of it as the fuel that keeps the whole thing running (which is why those fees are called "gas"). Miners utilize their hardware to solve intricate mathematical equations and validate transactions on the Ethereum Classic network. The first miner to solve the equation and validate a new block is compensated with a block reward in the form of ETC tokens. Biweekly, the network automatically modifies the difficulty of mining Ethereum Classic to maintain a consistent block production rate. The new difficulty is determined by the total computational power of the network, and it becomes increasingly challenging to mine ETC as more miners join the network. Like ETH, new ETC is issued to the circulating supply as a reward for miners as new blocks of transactions are added to the blockchain. Unlike ETH, however, which doesn't have a fixed supply, ETC has a maximum supply of 210,700,000 coins.