# What is a Nonce in Blockchain?

The “Nonce” in the Blockchain is a 32-bit (4-byte) long field, the value of which is set so that the hash of the block will consist of a sequence of bits = 0 running at the beginning.

Blockchain is the foundation of cryptocurrency. To keep the blockchain secure, data from previous blocks is encrypted or has been chopped into a series of numbers and letters. This is done by processing the block input through a function, which produces a fixed length output. The function used to generate the hash is deterministic, meaning it will produce the same result each time the same input is used; can produce an efficient hash input; makes identifying inputs difficult (resulting in mining); and making small changes to the input results in a very different hash.

Any change to the block data (like nonce) will result in the block hash being completely changed. It is impossible to predict which combination of bits will yield a valid hash, so many different nonce will be tried, for each different nonce, the hash will be recalculated until the final hash contains the number. appropriate number of 0 bits. The appropriate number of 0 bits is evaluated based on difficulty. The generated hash must have a value less than the current difficulty and therefore must contain a few leading zeros to be less than the required evaluation. This repetitive calculation process requires time and effort. Therefore, the new block with the correct nonce will constitute a proof of work.

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