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.
Bitcoins are taking over the crypto-currency marketplace. They’re the largest and most well-known digital currency. Many large companies are accepting bitcoins as a legitimate source of funds from Amazon to Subway.