A consortium blockchain is often said to be partially decentralized, where the consensus process is executed by a small group of authorized nodes. For example, a consortium of three game companies plan to launch a blockchain with cryptocurrencies which can be spent in their games. Each of them runs a node to verify transactions and mine blocks. Game players, however, only have access to reading blocks and sending transactions. In this situation, just the three authorized nodes need to reach a consensus on block producing.
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