Number Used Once

Number Used Once or Number Once. A nonce, in information technology, is a number generated for a specific use, such as session authentication. Typically, a nonce is some value that varies with time, although a very large random number is sometimes used. In general usage, nonce means “for the immediate occasion” or “for now.” In the case of Blockchain Proof of Work scenarios, the hash value, found by a Miner, matching the network’s Difficulty thus proving the Block Validity is called Nonce as well.

Reference:

http://ethdocs.org/en/latest/glossary.html

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