The NCA have released the image of Worthing man Daniel Farrar to The Argus, who was one of the website’s 300 users across 38 countries.
The 21-year-old, of Compton Avenue, was found in possession of the indecent category A images in April.
He was handed a six-month suspended prison term.
He was also ordered to complete 31 days at a rehabilitation group.
The NCA confirmed Farrar is one of seven men from the UK who, so far, have been found to have used the site.
More than 250,000 horrific videos of sexual abuse of children were available through the website called “Welcome To Video”.
Paedophiles from around the world, who did not upload their own abuse videos, paid in bitcoin to download the videos.
Chilling images released by the NCA, which show what the website looked like, reveal users were told not to upload porn over the age of 15.
To download videos, users either had to spend points – obtained when they uploaded their own videos of abuse, or purchased with near-untraceable currency, Bitcoin.
NCA uncovered the “horrific” website during an investigation into British paedophile Dr Matthew Falder.
Cambridge graduate Falder admitted 137 offences which included encouraging child rape, and sharing images of the abuse of a newborn baby.
He has been jailed for 25 years.
Another man sentenced for his involvement was Kyle Fox, 26.
Fox, from Surrey, admitted 14 charges against a five-year-old boy including seven rapes and and five charges of sexual assault against a three-year-old girl.
Footage of him abusing the girl was uploaded to the Welcome To Video site.
The US Department of Justice have charged South Korean suspect Jong Woo Son, 23, with running the website which was available on the “dark web”.
There have been 337 suspected arrested globally, in countries including America, Ireland, Saudi Arabia, Germany and Spain.
Nikki Holland, NCA Director of Investigations, said: “Dark web child sex offenders – some of whom are the very worst offenders – cannot hide from law enforcement.
“They’re not as cloaked as they think they are.
“They’re not as safe as they think they are.
“I’m immensely proud of the role we played in catching some very depraved and dangerous global offenders and for beginning the work that eventually caught Jong Woo Son.”
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