If you want to keep your transaction private, you may want to not use a contract assignment form at all. When I wholesale property, I use a standard contract, one for buying and one for selling the property. I submit both to the title company and they do a double closing, using the buyers' cash to fund the purchase price to the seller and cutting me a check for the difference. I'm sure there's more information elsewhere on this site about double closings, why they're favorable to contract assignments, and how they work.