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6

nTime: blocks must have a higher timestamp than the median of the 11 previous blocks, and a lower timestamp than two hours in the future of the validating node's own clock. Assuming a regular block interval of ten minutes and a correctly set local time, the block can therefore be stamped between about one hour in the past and two hours in the future. nBits: ...


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nBits cannot be changed at all. Its value must equal the (compact encoding of) the target value for that block, which is determined entirely by the predecessors of the block. In other words, if the prevblock hash is given, so is nBits. nVersion: can be modified arbitrarily, though its value is subject to interpretation under BIP34 (requiring it to be at ...


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