OBSR (Observer Coin) is a utility cryptocurrency that facilitates the trading of crowdsourced weather data. Users obtain OBSR by sending personal weather observations (such as air temperature, pressure, humidity, and fine dust concentration) to the Observer Foundation. Whenever an observation is successfully made, the details are recorded in coins and ROT, and the data provider receives OBSR as a reward. All observations are quality-controlled by meteorological experts and managed through big data technology. Data buyers can purchase OBSR from cryptocurrency exchanges for weather data and obtain data through the Observer Foundation.