To hedge the counterparty risk of entering a CDS transaction, one practice is to buy CDS protection on one's counterparty. The positions are marked-to-market daily and collateral pass from buyer to seller or vice versa to protect both parties against counterparty default, but money does not always change hands due to the offset of gains and losses by those who had both bought and sold protection. Depository Trust & Clearing Corporation, the clearinghouse for the majority of trades in the US over-the-counter market, stated in October 2008 that once offsetting trades were considered, only an estimated $6 billion would change hands on October 21, during the settlement of the CDS contracts issued on Lehman Brothers' debt, which amounted to somewhere between $150 to $360 billion.