A method of collecting peer-to-peer (P2P)-based content sending/reception information is disclosed herein. In the method of collecting P2P-based content sending/reception information, a first peer accesses a second peer, and exchanges buffer maps with the second peer. The first peer requests the second peer to send a piece of content not owned by the first peer. When the reception of the piece of the content is completed, the first peer generates a receipt message and then signs the receipt message. The first peer sends the signed receipt message to the second peer. The second peer signs the signed receipt message again. The second peer sends the dually signed receipt message to a server.