Run this command:
yarn hexify-string --message "hello world"
to produce this output:
68656c6c6f20776f726c64
Run this command:
yarn recover-address --message "hello world" -r "..." -s "..." -v [0|1]
to produce this output:
{ recoveredAddress: '0x6D33805F7878Cc1f33fd804eCae36235db65d7ef' }