Bitcoin addresses the issue of double-spending by utilizing a decentralized network of nodes that maintain a public ledger called the blockchain. When a Bitcoin transaction is made, it is broadcast to the network and verified by multiple nodes through a process called mining. Miners compete to validate the transaction and add it to a new block in the blockchain. Once a transaction is included in a block and added to the blockchain, it becomes irreversible, making it extremely difficult for someone to spend the same Bitcoin twice. Additionally, Bitcoin employs a proof-of-work consensus mechanism to ensure that only one valid chain is accepted by the network, further preventing double-spending attempts.
