Short answers, pulled from the story.
Great Britain paid the United States $15.5 million on the 8th of September 1873. This sum balanced against damages of $1,929,819 paid by the United States to Great Britain for illegal Union blockade practices.
Britain sent Sir Alexander Cockburn while the United States included Charles Francis Adams with William Maxwell Evarts serving as counsel. Italy provided Federico Sclopis and Switzerland contributed Jakob Stämpfli. Brazil sent Marcos Antônio de Araújo, Viscount of Itajubá.
The Senate ratified that treaty on the 24th of May 1871. The final award formed part of the Treaty of Washington signed in March 1871 following negotiations at Suitland, Maryland.
Such acts may have lengthened the Civil War by two years. This extension cost 400,000 more lives of soldiers and civilians on both sides.
Sir Alexander Cockburn ruled that her release did not violate Britain's neutrality because she was not outfitted with guns when leaving port. This legal decision allowed the vessel to begin its destructive campaign against the United States.