Coin Review: Countries are trying to replace the status of the US dollar; the EU has tried, Japan has tried... all have failed, while the mysterious Bitcoin has emerged. Mobile and Unicom never expected that the one to take away the SMS business would be WeChat. The one taking away business may not be a competitor; it could be the development of the times and technological progress, it is a trend, it is a fashion. Sovereign currencies may have quietly drifted away, just like the gradual fading of newspapers, radio, television, and publishing that have flourished for hundreds of years.