Explosion of information and communication technologies providing worldwide connection through the Internet as well as the unstoppable development of technology is transforming how development is done locally and globally. Blockchain technology aims to build applications based on decentralized architecture, in which has received extensive attention currently. A decentralized peer-to-peer system is applied to record pseudonymous transactions in trustless environment. It is believed that blockchain has a significant role for the rapid growth of application domains such as public services, Internet of Things, supply chain management. We provided a short introduction of blockchain technology. Finally, we also discussed the impacts and challenges when applying this promising technology in Vietnam context.
We propose a new proof-of-work protocol called "Flexible Proof-of-Work" to generate an unpredictable set of numbers. This can be seen as a component of a general framework for a decentralized random number generator. The algorithm ensures experimentally that the result is feasible and unpredictable. Moreover we demonstrate that the algorithm can be easily implemented on Ethereum blockchain system by smart contracts, and miners who have limited resource are still able to compute solutions. Meanwhile during the process, the problems are changing continuously by taking new solutions into account, making an adversary hard to attack the protocol by pre-calculating the final results.
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