What Is a Bitcoin Node? Why It Matters for Security

A Bitcoin node is a computer that runs the Bitcoin software and enforces the rules of the network. Nodes are what make Bitcoin decentralized. --- ## What nodes do Nodes validate transactions and blocks. They check that: - Transactions follow the rules - Signatures are valid - No bitcoin is double spent - Blocks are properly formed If something breaks the rules, nodes reject it. --- ## Nodes do not trust miners Miners propose blocks. Nodes verify them. If a miner creates an invalid block, nodes ignore it. This ensures that miners cannot change the rules on their own. --- ## Why nodes matter Nodes protect the integrity of Bitcoin. They ensure that: - The supply limit is enforced - Transactions are valid - The system remains decentralized Without nodes, Bitcoin would rely on trust instead of verification. --- ## Running a node Anyone can run a Bitcoin node. It requires: - Software - Storage for the blockchain - A stable internet connection Running a node gives you direct verification instead of relying on third parties. --- ## Final takeaway Nodes are the backbone of Bitcoin. They enforce the rules, verify transactions, and keep the network honest.