Update miner.py

[tabVersion]

there is something wrong the error is TypeError: the JSON object must be str, not 'bytes' the solution is from stackoverflow

https://stackoverflow.com/questions/42683478/typeerror-the-json-object-must-be-str-not-bytes

[HourGlss]

This does not fix my issue

[HourGlss]

It's a problem with putting some ECDSA keys. Just make sure that there's no "+" in either the public or public key... works fine for me now. I don't know you "shortened" the key

[ikebo]

same issue here, is there anyone to merge?