$BTC C Bitcoin uses a proof-of-work (PoW) mechanism to secure its network, requiring miners to solve complex mathematical problems to validate transactions. This energy-intensive process ensures the integrity of the network, as changing a block requires re-mining all subsequent blocks, which is computationally infeasible. PoW incentivizes miners with BTC rewards, combining economic incentives with cybersecurity. Despite environmental concerns, the reliability of PoW is fundamental to Bitcoin's trustworthiness, making it a reliable system for decentralized transactions worldwide.