a bitcoin block exploer build by react

• setup by create-react-app
• use new code style hock functions
• use material-ui
• display bitcoin block data (some fields are not returned from the API, I left blank there)
• transaction pagination (the API does not return fee's descrption, just hardcode there *****  174.312 sat/B - 79.516 sat/WU - 536 bytes *******)

npm run dev

npm run build

  the test will find the text input, and then put a block hash, wait for the data loading and then check if the block data is matched the input

since the block info api not returning all the information, I set up this server to combine all the api the purpose of building this backend is to build the following api

return basic block data,use anyway and combine result all-in-one object for example,  to calculate the confirmations need the block count from https://blockchain.info/q/getblockcount the difficulty not return from the api, but can get from the bitcoin-cli

$ bitcoin-cli getblockheader 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
{
  ...
  "height": 0,
  ...
  "bits": "1d00ffff",
  "difficulty": 1,
  ...
}

also, the backend can server the frontend's build directory as an dapp.