Based on blockchain technology, crypto-currency is popular around the world for its convenient payment methods, low transaction fees, transparency and neutral operating mechanism, and high-level security and privacy protection. The cryptocurrency has the advantage that transaction record is publicly verifiable and does not depend on a centralized third party. However, since the blockchain system needs to keep every record of valid transaction, as the transaction record accumulates, a user has to face the problem that the system historical transaction data is increasingly large. On the other hand, if a blockchain crashes because of unforeseen reasons, it is difficult to recover the original transaction data due to the lack of an out-of-chain backup mechanism. In response to these problems, this study designs a blockchain scheme for clearing and settlement. In this scheme, all the user chains can back up the data of their transaction status, and the original transaction record can be roughly restored if the user chain collapses. The scheme also proposes a new idea for the construction of digital currency light wallet, through which the user node can reduce the data storage of the original user chain. In addition, by calculating the relative prices of various digital currencies, the full net price of all digital currencies is realized, providing a value ruler for users to cross-chain transactions. This scheme has a multi-level scalability and a high-level security which is ensured by sufficient computing power.
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