Blockchains are immutable distributed ledger systems usually without a central authority. Blockchains enables people to establish trusted application among untrusted parties. But, the performance of blockchain is a challenge for massive applications. There are many researches to improve the performance of blockchain including side blockchain, interconnection of blockchains. In fact, a distributed application usually needs resource of computing, storage and transportation, even with possible permissioned access. It means that any current blockchain cannot satisfy all the demands simultaneously. This paper proposes a new Blockchain Federation that consolidates several blockchains to support complex distributed applications. Two typical application scenarios are implemented following the proposed concept of Blockchain Federation. The new emerging blockchain technology are combined together to meet the demands of complex peer-to-peer applications. And, the conclusions are drawn and future direction of Blockchain Federation evolution, Federation Blockchain, is discussed as well.
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