Users who agree a deal on such a site visit a dedicated Kevin website and chat with the bot, which asks for details of the transaction and then sends a unique link which the user shares with their counterparty. Kevin then checks to see if the reputations of both parties are good. If they are, it creates a transaction on blockchain to timestamp that they have agreed to the deal. The bot then automatically buys $10 worth of bitcoin. If the transaction ends well, Kevin sells $10 worth of bitcoin but if it does not and a payout is needed, $100 is added to the open balance sheet.

https://www.finextra.com/newsarticle/30146/kevin-the-bot-uses-blockchain-to-offer-insurance-for-p2p-transactions?utm_medium=twitter&utm_source=dlvr.it