× Bitcoin is a cryptocurrency and worldwide payment system. It is the first decentralized digital currency – the system works without a central repository or single administrator.

× 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.

× In the United States, the bit is equal to one eighth of a dollar or 12 1⁄2 cents. In the U.S., the "bit" as a designation for money dates from the colonial period, when the most common unit of currency used was the Spanish dollar, also known as "piece of eight", which was worth 8 Spanish silver reales.

× Bitcoin to Dollar (usd) is a Bitcoin converter/calculator. Right now, we offer four converters: Satoshi to Bitcoin (BTC) and Bitcoin (BTC) to Satoshi, Bitcoin to usd and Satoshi to usd.