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Multiple pre-selected nodes are designated as bookkeepers within a group. The generation of each block is determined by all pre-selected nodes(pre-selected nodes participate in the consensus process), and other access nodes can participate in the transaction. But regardless of the bookkeeping process(essentially managed bookkeeping, it just becomes distributed bookkeeping, the number of pre-selected nodes, and how to determine how the bookkeeper of each block becomes the main risk point of the block chain), Any other person can make a qualified query through the API open to the block chain.
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