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Since 2017, blockchain projects have appeared like a blowout; by the end of 2017, more than 80,000 projects were uploaded on GitHub. With the increase in the types of cryptocurrencies and the expansion of the market size, the problem of low interoperability between blockchains and limiting the application space of various projects has also emerged. In order to "open up" the value transmission channel; teams including Ripple and the Ethereum Foundation have successively proposed solutions that can realize interoperability between different chains - cross-chain technology.