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(ID: hashpai), author: not broken, reproduced with authorization.Blockchain is a kind of distributed ledger technology. Each blockchain is equivalent to an independent ledger. Usually, value transfer between different ledgers cannot be realized.With the development of technology and market, there are more and more types of cryptocurrencies, and at the same time, a large number of different blockchains have emerged. Collaboration between different chains has become a new demand of users from operation and value circulation, so the "cross-chain technology" of blockchain came into being.the so-called"Cross-chain" means that the assets originally stored on a specific blockchain can be converted into assets on another chain, thereby realizing the circulation of value

. It can also be understood as an exchange behavior between different asset holders. This process does not actually change the total value on each blockchain.Just like the currency trading provided by the trading platform

, Different types of digital currencies can be exchanged, but this behavior of the trading platform does not happen on the blockchain.