  Determining the trust of an individual Bitcoin wallet is a difficult problem.
There are no ratings, that offer vendors or exchanges meaningful information
about the level of the taint of Bitcoins they are receiving. Lack of such
information places exchanges liable in an event when the received Bitcoins are
stolen or ill-gotten. In this paper, we try to solve this problem by
introducing a Bitcoin address taint score called TaintRank. It provides insight
into a specific wallet by taking the addresses it interacted with throughout
history into consideration. This ranking method provides such Bitcoin exchange
companies insight with whom they are trading.
