17/10/2017
A transaction is a transfer of value between Bitcoin wallets that gets included in the block chain. Bitcoin wallets keep a secret piece of data called a private key or seed, which is used to sign transactions, providing a mathematical proof that they have come from the owner of the wallet.So the blockchain system has been designed to use nodes agreement to order transactions and prevent the fraud described above. The Bitcoin network orders transaction by putting them together into groups called blocks, each block contains a definite amount of transactions and a link to the previous block.
