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protocol. We use the term “extended bitcoin network” to refer to the overall network that includes the bitcoin P2P protocol, pool mining protocols, the Stratum protocol, and any other related protocols connecting the components of the bitcoin system. Nodes Types and Roles While nodes in the bitcoin P2P network are equal, they may take on different “roles” depending on the functionality they are supporting. A bitcoin node is a collection of functions: routing, the blockchain database, mining, and wallet services. A full node with all four of these functions is shown below: Figure 6-1. A bitcoin network node with all four functions: Wallet, Miner, full Block‐ chain database, and Network routing All nodes include the routing function to participate in the network and may include other functionality. All nodes validate and propagate transactions and blocks, and dis‐ cover and maintain connections to peers. In the full node example above, the routing function is indicated by an orange circle named “Network Routing Node”. Some nodes, called full nodes, also maintain a complete and up-to-date copy of the blockchain. Full nodes can autonomously and authoritatively verify any transaction without external reference. Some nodes maintain only a subset of the blockchain and verify transactions using a method called Simplified Payment Verification or SPV. These nodes are known as SPV or Lightweight nodes. In the full node example above, the full node blockchain database function is indicated by a blue circle named “Full Blockchain”. SPV nodes are drawn without the blue circle, showing that they do not have a full copy of the blockchain. 140 | Chapter 6: The Bitcoin NetworkPDF Image | Mastering Bitcoin
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