ED25519 Child Key Derivation
A general common technique is used in PGP 
"key rings" or "key chains". You generate a master public-key pair and distribute your master public key. Use this master private key to certify your other generated keys so that you can store your private key securely, probably off-line, and use the other keys for daily usage. With your master public key, the certificates of the other generated keys in the chain can be verified.