A Memory-Hard Blockchain Protocol

Bitcoins cryptocurrency is a decentralized digital currency released as open-source software in 2009. In these 9 years of development, the mining devices are changed from the public CPUs into a professional ASICs. The ASICs is a application-specific integrated circuit, which is designed exclusively for mining. Because of its outstanding computing power, the ASICs gradually replaced other devices and monopolies the Bitcoin market. In this paper, we propose a new blockchain chain protocol, which allows us to adjust the loading time of the mining process. This strategy reduces the ASIC and CPU mining rate of the gap. So that the using of ASIC mining is limited. Finally, we analyzed the safety of this new chain structure and compared it to the original chain protocol.