Usage: keychain.getHardenedDIP9FeatureHDKey(type)
Description: Return a safier root key to derivate from

Parameters:

parameters	type	required	Description
type	string	no (default:HDPrivateKey)	Enter a valid type (one of: ['HDPrivateKey','HDPublicKey'])

Returns : HDPrivateKey (of path: m/9'/1' on testnet or m/9'/5' on livenet)

Example:

const hdPrivateKey = keychain.getHardenedDIP9FeatureHDKey();
const { privateKey } = hdPrivateKey;