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Is it always possible to find an hash value of a block, smaller than the current difficulty, just using 4 byte (Nonce) ? How can we be sure about it ?
Does 4 byte Nonce enough to proof of work?
Answers
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No, it is not enough.
There is extra-nonce field. The scriptSig of coinbase transaction.
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possible duplicate of How can we be sure that a new block will be found?
– Murch – 2016-12-09T13:29:40.000