"The sheer number of individuals Finkbiner exploited and extorted justifies a sentence Finkbiner is almost certain not to outlive," prosecutors said in court documents filed June 18 in U.S. District Court in Terre Haute, Ind.
The judge, as is customary with sexual offenders, also ordered Finkbiner to be supervised by federal officials for the rest of his life following his release.
Finkbiner's defense attorney, Monica Foster, didn't return phone calls from The Associated Press seeking comment.
He was charged in April 2012 with operating a "sextortion" scheme that targeted hundreds of minors across the country, some as young as 12 years old. Investigators who analyzed electronic media seized from him found more than 22,000 video files captured from webcam feeds, about half of which depict sexual conduct, court documents say.
According to prosecutors, Finkbiner met most or all of his victims on a video chat website, omegle.com, which offers users random, anonymous one-on-one chats with strangers. The site says it is not for use by children under 13 or teens younger than 18 who don't have the permission of a parent or guardian.
Prosecutors say the teens thought they were looking at live images of people who were acting sexually and encouraging the teens to do the same, but the images were actually recordings Finkbiner was showing them. He would later contact the teens again and threaten to upload their explicit images to porn websites unless they made more videos for his private use, prosecutors say.
The alleged victims ranged in age from 12 to 16 years and lived in nine states — Indiana, West Virginia, Iowa, Wisconsin, Ohio, New York, Michigan, Illinois and Colorado.
In one case cited in court records, a 12-year-old Michigan boy pleaded with Finkbiner not to upload explicit videos of him after he refused to do any more, but Finkbiner posted them on the Internet anyway.
Prosecutors said the case is an example of "sextortion," a crime that authorities are seeing with greater frequency in which Internet predators catch victims in embarrassing situations online and threaten to expose them unless they create sexually explicit photos or videos.