$BTC Bitcoin uses proof-of-work (PoW) to secure its network, requiring miners to solve complex mathematical problems to validate transactions. This energy-intensive process ensures network integrity, as altering a block demands re-mining all subsequent blocks, which is computationally infeasible. PoW incentivizes miners with BTC rewards, aligning economic motives with network security. Despite environmental concerns, PoW’s robustness underpins Bitcoin’s reliability, making it a trusted system for decentralized transactions worldwide.