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 ?
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1possible duplicate of How can we be sure that a new block will be found?– Murch ♦Dec 9, 2016 at 13:29
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1 Answer
No, it is not enough.
There is extra-nonce field. The scriptSig of coinbase transaction.
