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Network Discovery When a new node boots up, it must discover other bitcoin nodes on the network in order to participate. To start this process, a new node must discover at least one existing node on the network and connect to it. The geographic location of the other nodes is irrelevant, the bitcoin network topology is not geographically defined. Therefore, any existing bitcoin nodes can be selected at random. To connect to a known peer, nodes establish a TCP connection, usually to port 8333 (the bitcoin “well known” port), or an alternative port if one is provided. Upon estab‐ lishing a connection, the node will start a “handshake” by transmitting a version mes‐ sage, which contains basic identifying information, including: • PROTOCOL_VERSION, a constant that defines the bitcoin P2P protocol version the client “speaks” (e.g. 70002) • nLocalServices, a list of local services supported by the node, currently just NODE_NETWORK • nTime, the current time • addrYou, the IP address of the remote node as seen from this node • addrMe, the IP address of the local node, as discovered by the local node • subver, a sub-version showing the type of software running on this node (e.g. “/ Satoshi:0.9.2.1/“) • BestHeight, the block height of this node’s blockchain (See https://github.com/bitcoin/bitcoin/blob/ d3cb2b8acfce36d359262b4afd7e7235eff106b0/src/net.cpp#L562 for an example of the version network message) The peer node responds with verack to acknowledge and establish a connection, and optionally sends its own version message if it wishes to reciprocate the connection and connect back as a peer. 144 | Chapter 6: The Bitcoin NetworkPDF Image | Mastering Bitcoin
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