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Blockchain, a trustless and distributed consensus system, allows you to send and/or receive money from someone without turning to third-party services. By creating a distributed network of ledgers that work together to keep all transactions, contracts and accounts public, they eliminate the need for mediation to large extent via a concept named as Proof of work. Proof of work is a requirement to define an expensive computer calculation, also called mining, that needs to be performed in order to create a new group of trustless transactions (the so-called block) on a distributed ledger called blockchain. All the network’s miners compete to be the first to find a solution for the mathematical problem that concerns the candidate block, a problem that cannot be solved in other ways than through brute force, essentially requiring a huge number of attempts. When a miner finally finds the right solution, he/she announces it to the whole network at the same time, receiving a cryptocurrency prize (the reward) provided by the protocol.