Digital currency settlement system and settlement method and payment device

A digital currency settlement system, comprising a payment device (1), a digital currency block chain system (3), a network server (4), a management center (5), and a settlement terminal (6), wherein the management center (5) is respectively connected with the network server (2) and the digital currency block chain system (3), the settlement terminal (6) is connected to the management center (5) through the network server (2), and there are also nodes 1 . . . n connected that can confirm transactions in the digital currency block chain system (3) in addition to user B and the management center (5),

• the payment device (1) is used for paying digital currency to other users, and the payment device (1) at least stores account addresses of the users in the digital currency block chain (3),
• when the user A pays or transfers the digital currency to the user B by using the payment device (1),
• the settlement terminal (6) reads at least an account address of user A in the digital currency block chain (3) from the payment device (1), and generates a transaction after identifying the information, the transaction is sent to the management center (5) through the network server (2), and the transaction information comprises the account address of the user A in the digital currency block chain read by the payment device (1), an account address of the user B who receives a payment in the digital currency block chain, and an amount y of digital currency moved from the account address of the user A in the digital currency block chain to the account address of the user B in the digital currency block chain,
• the management center (5) stores at least the account addresses of the user A and the user B, and an account address of the management center (5) in the block chain, wherein accounts of the user A and the user B are used for transferring the intermediate currency, and a certain amount of intermediate currency is pre-stored in the account of the user A, the management center (5) converts the amount y of digital currency in the transaction information into a corresponding amount Y0 of intermediate currency according to the received transaction, and moves the corresponding amount Y0 of intermediate currency from the account of the user A to the account of the user B, after a certain time or after the intermediate currency transferred to the account of the user B reaches a certain amount, the management center (5) counts a total amount Y of intermediate currency in the account of the user B, converts the total amount Y of intermediate currency into a corresponding amount Z of digital currency, and sends the transaction to the digital currency block chain (3), and records the transaction as a block at an end of the block chain and after confirmation by the nodes (1 . . . n), the transaction information comprises the account address of the management center (5) in the block chain, the account address of the user B in the block chain, and the amount Z of digital currency moved from the account address of the management center (5) to the account address of the user B in the block chain;
• after the digital currency is successfully moved, the management center (5) subtracts a corresponding amount of intermediate currency from the account of the user B.