Though I just saw this from a proposed transcript: The answers are Jackson's.
Q: Did anybody pay you any money to help throw that series in favor of Cincinnati?
A: They did.
Q: How much did they pay?
A: They promised me $20,000, and paid me $5,000.
Q: Who promised you the twenty thousand?
A: “Chick Gandil.
Q: Who is Chick Gandil?
A. He was their first baseman on the White Sox Club.
Q: Who paid you the $5,000?
A: Left Williams brought it in my room and threw it down.
Q: Who is Lefty Williams?
A: The pitcher on the White Sox Club.
Q: Where did he bring it, where is your room?
A: At that time I was staying at the Lexington Hotel, I believe it is.
Q. On 21st and Michigan?
A. 22nd and Michigan, yes.
Q: Who was in this room at the time?
A: Lefty and myself, I was in there, and he came in.
Q: Where was Mrs. Jackson?
A: Mrs. Jackson–let me see–I think she was in the bathroom. It was [a]suite; yes, she was in the bathroom, I am pretty sure.
Q: Does she know that you got $5,000 for helping throw these games?
A: She did that night, yes.
The whole transcript is here, surprised I haven't seen it before..
http://law2.umkc.edu/faculty/projects/ftrials/blacksox/shoelessjoe.pdf