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For block to be considered legitimate it has to have hash value lower than set target. There is no minimum target. Proof-of-work PoW is designed so that miners expend resources hardware and electricity to secure the network, which concurrently creates an incentive for miners to secure the network because their reward for mining is received directly in bitcoins and they have invested electricity and hardware into acquiring bitcoins. Why is the difficulty important? Bitcoin has multiple nuanced components that make it a successful and novel technology, and its difficulty adjustment is assuredly one of its most profound. A larger blockchain requires more storage capacity for regular full nodes, which confers a burden on users who run full clients, eventually forcing many of them to stop running nodes because their consumer laptop or desktop cannot adequately store the blockchain that is characteristic of full nodes.