That has worried some skeptics, as it means a hack could be catastrophic in wiping out people’s bitcoin wallets, with less hope for reimbursement. No one controls these blocks, because blockchains are decentralized across every computer that has a bitcoin wallet, which you only get if you buy bitcoins. The exchange rate that BitPay has calculated for every payment is disclosed on the payment request by clicking on the circular “” icon in the upper right corner. There are several differences between a blockchain and a database, including the level of control. Is Bitcoin allowed in Saudi Arabia? Bitcoin is legal is Saudi Arabia. OneRead More →