```
cp secrets.sample.js secrets.js
```
Enter your rpc call info (DM me if you need info for a test server)
`npm run rpc` and response good
Change `scripts/testRpc.js` so that `const blockhash === 'foo'`
`npm run rpc` and get the error msg from the node (`blockhash must be of length 64 (not 3, for 'foo')`)
Change your rpc params in `secrets.js` so that your url is bad
`npm run rpc`, returns false, error msg is logged