A sign of the times in Johnson City, where city leaders are considering a measure to allow cryptocurrency mines in town. The Johnson City planning commission will consider an ordinance on Tuesday to change some zoning rules to allow for such mines within the city limits. However, cryptocurrency mines have been controversial in other communities. Residents in rural Washington County, tennessee, have long complained about loud server fan noise at an operation on Bailey Bridge Road. A lawsuit has resulted in the cryptocurrency mine being forced to move by the end of next year.