  Blockchains have attracted a great deal of attention as a technology for the
distributed management of register information at multiple nodes without a
centralized system. However, they possess the drawbacks of low transaction
throughput and long approval time. These problems can be addressed by
shortening the block generation interval; however, shortening this interval
alone has the effect of increasing the frequency of forks. In this study, we
aim to shorten the block generation interval without increasing the fork
generation rate by improving the network topology of the nodes and shortening
the propagation time. We propose a neighbor node selection method forming a
network topology with a short block propagation time. A blockchain simulator is
used to demonstrate the effect of the proposed neighbor node selection method
on the propagation delay of the network. This result indicates that the
proposed method improves block propagation time.
