Umar Patek was found guilty on all six charges at a court surrounded by snipers and bomb defusal experts.
Aside from his role in the Bali bombings, he also mixed chemicals for 13 bombs that detonated in five churches in the capital on Christmas Eve in 2000 and killed around 15 people.
The Bali bombs were a watershed for Indonesia, which has the world's largest Muslim population, forcing the secular state to confront the presence of violent militants. It has since been largely successful in containing militant attacks.
Patek, 45, was captured in the same Pakistan town where US forces killed Osama bin Laden, and security officials say he belonged to the banned Jemaah Islamiah group linked to the al Qaeda.
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