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Too many public blockchains exist and they all use different API and data structure. If there isn’t a standardized interface that is compatible to all blockchains, it is impossible to interconnect different blockchains. An understandable blockchain environment is especially important, because smart contracts can define various types of data structure and processing. We name the blockchain that provides a series of environments that help to efficiently process and analyze blockchain data as “Understandable Blockchain (UBC)’s)