How did you came to know about Blacklist ?
Is it referred in Parivahan or got a notice or have sold the car and then came to know
> Do you have all original tax receipts ?
> Is any traffic offence pending on car or by any chance was involved in court case ?
> Is it a Used car, bought from some other other ?
> Any Commercial registration involved ?
If none of above then suggest to approach in local RTO with vehicle papers and documents
Also, for benefit of others - do update this post on the findings you get