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tioning attacks or Sybil attacks, where they are connected to fake nodes or fake networks and do not have access to honest nodes or the real bitcoin network. For most practical purposes, well-connected SPV nodes are secure enough, striking the right balance between resource needs, practicality, and security. For the truly security conscious, however, nothing beats running a full blockchain node. A full blockchain node verifies a transaction by checking the chain of thousands of blocks below it and checks that the UTXO is not spent, whereas an SPV node checks how deep the block is buried by a hand‐ ful of blocks above it. To get the block headers, SPV nodes use a getheaders message instead of getblocks. The responding peer will send up to 2000 block headers using a single headers message. The process is otherwise the same as that used by a full node to retrieve full blocks. SPV nodes also set a filter on the connection to peers, to filter the stream of future blocks and transactions sent by the peers. Any transactions of interest are retrieved using a getdata request. The peer generates a tx message containing the transactions, in re‐ sponse. 152 | Chapter 6: The Bitcoin NetworkPDF Image | Mastering Bitcoin
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