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Block explorer refers to application or websites which display information and status of transactions of a given public blockchain network. They usually do this by running their own nodes (they become part of the network), and then index information that may be relevant to the users. This opens up access to the data of a blockchain and allows regular users to look at progress of transactions or verify that a transaction has occurred without needing to run a node themselves.
A byzantine fault is where an error has occured, yet a computer system does not know due which component/what failed to the lack of information and continues to iterate on a given instruction.
A Qtum PoS miner using their own coins for staking. Qtum blockchain launched with Solo Stakers and will continue to have this available after offline staking launches.
