Financial technologies that serve the public must always have mechanisms for fraud mitigation and allow a human-in-the-loop to reverse transactions; blockchain

Financial technologies that serve the public must always have mechanisms for fraud mitigation and allow a human-in-the-loop to reverse transactions; blockchain permits neither. Human-in-the-loop is costly. Twitter, Youtube and card payments can't manage fraud mitigation well with all-kinds-of-humans-in-the-loop. Can't hurt to give the blockchain folk some space and time to innovate on cheaper, irreversible transactions.