The sentencing largely met the recommendations of prosecutors.

State prosecutors carried out nationwide raids in July 2017, coordinated by the federal police force, targeting nearly 70 suspects linked to the darknet site known as Elysium.  

Before German authorities shut it down in June 2017, the site had more than  111,000 members worldwide who traded images and video files of “the most serious sexual abuse of children, including babies,” prosecutors said.

They added that suspects used the US-based online group chat service Chatstep to exchange pornographic images and videos of children.

The platform, which had chat rooms in several languages including English,  German, French and Spanish and was online for about six months, was also used 
to plan the sexual molestation of children.

German prosecutors at the time of the raids hailed the cooperation with Chatstep, which was required under US law to report all cases of child pornography.

Darknet sites like the one uncovered in the case are invisible to most internet users and can only be accessed by using encryption technology.

They have repeatedly been used by criminals to trade drugs, weapons and child pornography.