What is the key_file's format

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1

Hello, I have a question that, in the cert-issuer, the key_file = .
What is the format of the file? Should it contains “ecdsa-koblitz-pubkey:”? Could you give me an example? Thank you.

2

Text file is fine, and no, it should just be the private key WIF as it is. No appending anything to it.

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3

I have pasted the WIF private key in key.txt file but when I run the command as cert-issuer -c conf.ini I got an error as:
pycoin.encoding.EncodingError: unexpected first byte of WIF
help me, please!