  Blockchain is a core technology to manage the value of cryptocurrencies, or
to record trails of important business trades. The Smart Contract on blockchain
is expected to improve security on blockchain system with automated operation,
but it cannot be the solution when the application service required to operate
tightly related blockchain ledgers as service business logic. This paper
proposed the method to extend the functionality of traditional Smart Contract
on blockchain, and introduced the prototype system, named 'ConnectionChain'.
