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node missing these blocks will then retrieve them, by issuing a series of getdata mes‐ sages requesting the full block data and identifying the requested blocks using the hashes from the inv message. Let’s assume for example that a node only has the genesis block. It will then receive an inv message from its peers containing the hashes of the next 500 blocks in the chain. It will start requesting blocks from all of its connected peers, spreading the load and en‐ suring that it doesn’t overwhelm any peer with requests. The node keeps track of how many blocks are “in transit” per peer connection, meaning blocks that it has requested but not received, checking that it does not exceed a limit (MAX_BLOCKS_IN_TRANS‐ IT_PER_PEER). This way, if it needs a lot of blocks, it will only request new ones as previous requests are fulfilled, allowing the peers to control the pace of updates and not overwhelming the network. As each block is received, it is added to the blockchain as we will see in the next chapter Chapter 7. As the local blockchain is gradually built up, more blocks are requested and received and the process continues until the node catches up to the rest of the network. This process of comparing the local blockchain with the peers and retrieving any missing blocks happens any time a node goes offline for any period of time. Whether a node has been offline for a few minutes and is missing a few blocks, or a month and is missing a few thousand blocks, it starts by sending getblocks, gets an inv response, and starts downloading the missing blocks. Exchanging “Inventory” | 149PDF Image | Mastering Bitcoin
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