Sidera is a project that is included in the Blockchain-based technology category. the project is from Lithuania, a country in northeastern Europe. Sidera project was born since September 2016 when almost 2 years ago I indicated that this project was well thought out.
So, no worry about the scam thing because it has been 2 years old since the project was built in the September 2016, it's a great thumbs up for them to keep developing the project without no problem until now.