Security and privacy have been important issues in VANETs. Anonymity is an effective way to achieve privacy protection, and it sometimes requires to be disclosed for determining traffic liability. In most pseudonymschemes, an authority is aware of a vehicle's secret, and its compromise will result in the leakage of a large amount of privacy information. So, the authors propose a distributed traceable pseudonym management scheme in VANETs. In the scheme, a blind signature method is adopted to achieve strict separation of issuance and tracking.