Wampum was more than money. Apparently the patterns could convey meanings. By searching for "Anthropology Wampum"
I found a number of sites in which wampum belts recorded treaties.Here's a sample:
Captain Montour lighted the Pipe of peace left here by the Warriors of the Ottawas, handing it to the General and the other Gentlemen of the Army, and Indians, to smoke, then acquainted the Indians by whom the Pipe was left, and upon what Occasion, shewing them the Belts left at the same time.

The General then made the following speeches:

Brethren, Chiefs and Warriors of the several Nations present: As we are met in Council to renew and brighten the Chain of Friendship, with this String of Wampum I open your Ears that you may hear what I am going to say to you.