publicly available information goes back only one year. The numbers provided by each source do not always match because each provider uses different sampling methods. Daily, intraday and real time data is available from S&P Capital IQ through their acquisition of Credit Market Analysis in 2012. According to DTCC, the Trade Information Warehouse maintains the only "global electronic database for virtually all CDS contracts outstanding in the marketplace." The Office of the Comptroller of the Currency publishes quarterly credit derivative data about insured U.S commercial banks and trust companies. Uses Credit default swaps can be used by investors for speculation, hedging and arbitrage. Speculation Credit default swaps allow investors to speculate on changes in CDS spreads of single names or of market indices such as the North American CDX index or the European iTraxx index. An investor might believe that an entity's CDS spreads are too high or too low, relative to the entity's bond yields, and attempt to profit from that view by entering into a trade, known as a basis trade, that combines a CDS with a cash bond and an interest rate swap. Finally, an investor might speculate on an entity's credit quality, since generally CDS spreads increase as credit-worthiness declines, and decline as credit-worthiness increases. The investor might therefore buy CDS protection on a company to speculate that it is about to default. Alternatively, the investor might sell protection if it thinks that the company's creditworthiness might improve. The investor selling the CDS is viewed as being "long" on the CDS and the credit, as if the investor owned the bond. In contrast, the investor who bought protection is "short" on the CDS and the underlying credit. Credit default swaps opened up important new avenues to speculators. Investors could go long on a bond without any upfront cost of buying a bond; all the investor need do was promise to pay in the event of default. Shorting a bond faced difficult practical problems, such that shorting was often not feasible; CDS made shorting credit possible and popular. Because the speculator in either case does not own the bond, its position is said to be a synthetic long or short position. For example, a hedge fund believes that Risky Corp will soon default on its debt. Therefore, it buys $10 million worth of CDS protection for two years from AAA-Bank, with Risky Corp as the reference entity,