My app is able to create a public and private key from BIP39. The uncompressed private key is concatenated with a sha256 (private key) and then encrypted via AES and saved to a file. To decrypt, you will need to decrypt the entire file, then take a hash from the first order of bytes and compare with the second half.
I plan to add support for BIP32, 43, 44 and am already working on it, but I am faced with the issue of storing information for creating backup.
My way of creating a file is not suitable, so I’m wondering if there is a ready-made BIP to solve this problem.