Major Challenges to Blockchain Mainstream Adoption: Industry View

Source: The Cointelegraph
Blockchain technology is still largely the preserve of the tech savvy and yet its benefits are widely lauded across the financial sector - and increasingly so across others too. Yet despite the major benefits of cost cutting, simplifying and securing, where is the widespread mainstream adoption in business?
With this in mind, CCgroup put it to those CEOs who have adopted technology: what are the major challenges to mainstream adoption of Blockchain technology?