With the advent of autonomous vehicles, the Vehicular Ad-hoc NETworks (VANETs) are emerging as an important technology for intelligent transportation systems. A privacy-preserving authentication scheme is considered as a promising solution for the evolving attacks in VANET environment. The existing ring-signature based authentication solutions in VANET either lack traceability of the signers or have high computation cost making it unsuitable for practical applications. To address this we propose an authentication scheme which offers both privacy and traceability with computation cost linear in the size of the ring O(n). The other problem is that existing schemes assume the certificate authority to be trusted. But this has serious implication if it is compromised. To address this the proposed work leverages Hyperledger Fabric to achieve transparency of the certificate authority. The network participants can monitor and hence verify the activities of a certificate authority. The performance of proposed work is measured and compared with the existing schemes. A security proof illustrating that the proposed work achieves the security goals of a privacy-preserving authentication scheme is also presented.