While browsing through the local craigslist ads, I realized there might be a need for a centralized database where people could report addresses that are involved in or associated with scams.
Its not possible. Someone make transaction from this address. What then? Its still scam involved address? Or someone else bought that bitcoin and he have no idea where it come from? Or bitcoin from scam involvd address tumbled it/sold it to exchange. What then? Its noble idea but with no chance to success, its same as you would mark $ bills that were involved in crime 