I have fully understood the mnemonic, private key and Keystore.

[WHeB]

I have fully understood the mnemonic, private key and Keystore.
Thank you for your help!
I closed this issue.

Originally posted by @CivelXu in #12 (comment)

[WHeB]

How to get mnemonic for private key import?Thank you!

[ricmoo]

You cannot derive a mnemonic from a private key.

A mnemonic phrase is a one-way relationship, given a mnemonic, you can derive any number of private keys at different paths, but given a private key there is no way to determine what mnemonic (if any) was used to derive it.

Generally, you should use a random price of entropy to generate your mnemonic, which you can then derive private keys from and use.