#includeCKey key; bool is_valid = key.IsValid();
#includeIn this example, we convert the private key from a string to CKey instance and then use the IsValid method to check if it's valid or not. Overall, CKey IsValid function is a useful tool to ensure the validity of private keys in the Bitcoin system. It's part of the Bitcoin Core library.std::string priv_key_str = "KxL3QTXzg9P9LZbRNvkvPWjKgPzR6USWU6rHwJgkc81Do1hj9XpC"; CKey key = CKey::FromString(priv_key_str); bool is_valid = key.IsValid();