what is bitcoin mining actually doing ?
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Mining is the process by which special bitcoin users (called miners) compete with each other to “discover” new bitcoins and add recent bitcoin transactions to bitcoin’s public ledger (the transaction blockchain).
In order to send or receive bitcoins, a bitcoin user must create a transaction and broadcast it to the entire network. Then, for this transaction to successfully go through, it must be permanently recorded on the blockchain. Mining is the process of adding recent transactions to the blockchain, and thereby making them a permanent part of the bitcoin “public ledger.”