In "The Crucible" Corey charges that Putnam is "killing his neighbors for their land." What does Danforth demand as proof?

Corey's charge is based on the testimony of "an honest man who heard Putnam say it", so Danforth demands:  "You will surely tell us the name" of the man who said this.  Corey refuses, and we can't blame him.  Corey says that "I mentioned my wife's name once and I'll burn in hell long enough for that.  I stand mute."  Plus, he just witnessed over 90 people be arrested for signing their name to a petition.  Danforth insists Corey reveal the name, claiming that "if you informant tells the truth let him come here openly like a decent man."  Corey still refuses, and in the end, is arrested for contempt of court.