Another reason Bitcoin mining remains by email. While the rewards are lower than they were a few byte of data a satoshi.
This can increase the speed and reduce the difficulty of mining, putting profitability within reach. A blockchain is a decentralized ledger of all the transactions across a network. You can increase your chances at profitability by joining a pool, but your rewards are based on your contribution to the mining effort, i. Because each hash created is random and impossible to predict, it can take millions of guesses, or hashes, before the target is met and a miner wins the right to fill the next block and add it to the blockchain.