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Node
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Nonce refers to "number only used once," is a random number the miners are solving for getting the Block Reward. This number is part of a block which gets hashed and rehashed to compute and validate based on the difficulty put by the network.
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Non-Repudiation
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Non-Fungible Tokens populary known as NFT are unique, indivisble and non-exchangeable assets that are created using strong cryptographic primitives on top of a Blockchain Network. These NFTs could represent a real-world physical, real-world digital or virtual assets. Examples include Cryptokitties which is a virtual game to breed kitties.