Appendix: Piin inscription digital currency is a fully circulated digital currency with no reservation and no insider trading. It focuses on fairness. Only fairness can truly have cohesion. Piin data is healthy and very beautiful. If you don’t believe it, you can also verify it with the people in the currency circle who understand blockchain around you. Piin can withstand any test and verification. Piin is a fair and ownerless currency. Let the blockchain present fairness again. Whether you hold Piin or not, you and your friends are welcome to come to the SPS meeting to feel the charm of our Piin community, communicate and learn together. At the same time, any friend is also welcome to correct the shortcomings and imperfections of the Piin community. We look forward to you and your friends working together to build the Piin community and welcome a better tomorrow!