What is Giles' proof against Mr. Putnam?

Giles claims that the proof is that if Jacobs hangs for a witch he forfeits his property and only Putnam can buy it. Giles claims that someone told him that he heard Putnam say that his daughter gave him a fair gift of land when she accused Jacobs. Giles refuses to name this person, however. When Danforth threatens Giles with contempt, Giles responds that this is not an official court session. Danforth arrests Giles for contempt, and Giles makes a rush for Putnam, but Proctor holds him back.