Four thousand of those runners were using Lympo Run to track their race, which rewarded them in cryptocurrency for hitting their fitness goals.
source https://www.google.com/url?rct=j&sa=t&url=https://www.runnersworld.com/news/a23086212/lithuanian-marathon-cryptocurrency-rewards/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNGEUsBWWYBBG4o1cqIv0BtRsB1BVw
