Nonce in Cryptography: Ensuring Unique Transactions
Nonce is an arbitrary number, intended to be used only once; it is generated when the transaction is hashed by the miner.
What is nonce?
Nonce (literal meaning for once) is a method of sequencing and separating transactions on the Ethereum blockchain and other smart contract platforms. In cryptography, it is used as a non-repeating number to protect communications. An Ethereum wallet can transmit multiple transactions from an account to the network without significant latency between them. Therefore, a mechanism is needed to determine which transaction is processed first. Otherwise there will be failures caused by conflicting transactions related to account balance transfers.
In this process, however, problems can arise because if a transaction with a lower nonce value gets stuck (due to gas volume), then all transactions received after that with a higher nonce value will also get stuck.
In the case where a transaction is stuck and not approved, users can raise the gas price and send the same transaction with the same nonce number. Since the nonce number remains the same and the fee has been increased, the probability of that transaction being approved is higher. In some wallets, both of these functions are automated.