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In crypto, a hash is the output of a function that is used to secure the blockchain and confirm transactions. The process of creating a hash is called “mining”, and the computers or nodes participating in the mining process are called “miners”.

Miners take a batch of transactions, called a block, and apply a hash function to it. The output of this function is a unique, fixed-length string of characters, called a “block hash”, which is then added to the blockchain, along with the block of transactions.

In addition, each block in the blockchain contains the hash of the previous one, which creates an almost unalterable chain, since manipulating one hash would imply doing the same with all the following ones.