test: http://localhost:8088/skchain/#/test
- cra build ** to Math.pow, should replace
var **=Math.pow
tovar **=(a,b) => a ** b
, at build/js/main.hash.js(TODO:fix at build tool, https://github.com/facebook/create-react-app/issues/10785) - use
node-polyfill-webpack-plugin
to build ipfs