[IMAGE: https://cdn.steemitimages.com/DQmVUy85zXNxQeKBfCm6VqoR9K33P57CgbP1jm6NJPhVBA2/pexels-photo-730557.jpeg]In simpler terms, if an owner of a Bitcoin would like to transfer a Bitcoin to another person, he publishes his intention and after the Bitcoin system checks that both these criteria are met; there is a Bitcoin in the wallet of the sender and it has not been sent to another person yet, the transaction gets recorded in a block attached to another block, hence the term blockchain. Once a transaction is completed, it cannot be undone or tampered with.

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