All possible nonce values are quickly scanned by modern bitcoin ASIC hardware, so with the same timestamp and extranonce you only have a tiny amount of work. The extranonce is part of the generation transaction, the transaction that generates new coins, which is the first transaction in the block. Nonces are used to defend against attacks on other users, for which they are fine, and you can't create a valid nonce for another user with this method. – janh Dec 29 '17 at 15:29 You're right, if they are user specific then it should suffice. Bitcoin (dont fork from here, fork from bitcoin/bitcoin) - TheBlueMatt/bitcoin Goto, multiple returns, continue, and/or multiple breaks in a loop are often used to build complex or non-local control flow in software. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchange The nonce does not need to be secret and can be saved together with the file without being encrypted. This is not insecurity, only the key is secret. The nonce helps to use a key securely for more than once. It is secure as long as a (key, nonce) pair never occurs twice. However, in order to decrypt any data, the nonce is also required.
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