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Getting the pubkey is very much just (in VB.NET):
Dim ecKey As New Nethereum.Signer.EthECKey("0000000000000000000000000000000000000000000000000000000000000000") Dim pubKey = ecKey.GetPubKey
Though if your input are mnemonics we might want to try something else
Ah. That ties to your earlier remark about BIP32, which using the parent's public key as a seed you'd derive the child public keys....
I haven't personally tried this before... But HdWallet allows the wallet to be initialised with a seed (overload Wallet(byte seed, string path = DEFAULT_PATH, IRandom random = null)) - Was wondering if this would help?