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A nonce is an arbitrary number intended for ONE-TIME use. It is often combined with a fine-grained timestamp to ensure that its identity is associated with a single point in time. A nonce does not need to be a random number, but generating a pseudorandom nonce is one WAY to increase its effectiveness.
A cryptographic nonce is used in cryptography to enhance secure communications. For instance, a nonce may be part of a two-factor authentication SYSTEM, where one of the factors may be used only once.
In cryptocurrencies such as bitcoin, nonces are used in the creation of cryptographic HASHES that securely connect a blockchain.
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