most Bitcoin users don’t store the entire blockchain on their devices. Instead, they only store a partial copy of the blockchain on their devices, making them what are known as lightweight nodes. They rely on other people to run full nodes, or computers that store the entire blockchain, to validate transactions and make sure they have the latest blocks on the blockchain.[371] The tradeoff is that people with lightweight nodes can’t be 100% sure that all the transactions they’re getting are legitimate; they have to trust the owners of the full nodes.
