[IMAGE: https://cdn.steemitimages.com/DQmbPWtFXt3b7pD9rEEzy3b29tvwnRuBceefTXTcSXpMczQ/image.png]
Short explanation: https://www.technologyreview.com/s/611187/how-to-get-blockchains-to-talk-to-each-other/
MIT research paper: https://arxiv.org/pdf/1805.05934.pdf