The block chain is a core technology that will lead the fourth industrial revolution with robots, big data, AI (AI), and Internet (IoT). Recently, due to the popularity of encrypted money based on block chaining such as bit coin and etherium, discussions on the introduction of block chains into the whole industry have been spreading beyond finance. It has been considered that the ultra-long-term block chain technology can be applied by financial technology, but it is spreading to various applications with various advantages. In recent years, block-chain technology has been used in various fields such as energy, automobiles, communities, sound sources, contents, distribution, and medical care. Block Chain Based Encryption The currency industry is still in its infancy and is experiencing many trials and errors. In particular, illegal drugs, weapons, and pornography, such as the Internet black market silk road, are causing side effects, but the block chain technology will play a key role in the fourth industrial revolution in the near future. In Korea, we are also making a variety of smart contracts, financing, and harbors through the block-chain EV charging stations of KEPCO and Nex leisure based on the block chain platform of Samsung SDS. It is considered that the case of Australia and Japan to watch the case of the block chain technology such as ICO, etc.