My biggest regret was when I first was made aware about Bitcoin. It was when I first looked into the darkweb way back 2011/2012 and was immediately made aware of the existence of Bitcoin and that there it was being used as a main form of currency of exchange. I regret not researching more into cryptocurrency and its complete potential because of underlying blockchain technology since I had this initial shady impression of Bitcoin being associated with the transactions going on in the darkweb.