Bitcoin's security model relies on a decentralized network of nodes that work together to maintain the integrity of the blockchain. This network uses cryptographic techniques to secure transactions and prevent fraud. Each transaction is verified by multiple nodes in the network before being added to the blockchain, making it extremely difficult for a single entity to manipulate the system. Additionally, Bitcoin uses a proof-of-work consensus mechanism, where miners compete to solve complex mathematical puzzles in order to validate transactions. This process makes it economically infeasible for attackers to alter the blockchain history or perform fraudulent activities. Overall, Bitcoin's security model is designed to be robust and resistant to attacks due to the decentralized nature of the network and the consensus mechanisms in place.
