One method <a href='https://medium.com/xiaohuiliu/access-external-data-from-bitcoin-smart-contracts-2ecdc7448c43'>https://medium.com/xiaohuiliu/access-external-data-from-bitcoin-smart-contracts-2ecdc7448c43</a>
One method <a href='https://medium.com/xiaohuiliu/access-external-data-from-bitcoin-smart-contracts-2ecdc7448c43'>https://medium.com/xiaohuiliu/access-external-data-from-bitcoin-smart-contracts-2ecdc7448c43</a>