returns the root key that the deterministichierarchy was created with . concode_field_sep Map<ImmutableList<ChildNumber>,DeterministicKey> keys concode_elem_sep int MAX_CHILD_DERIVATION_ATTEMPTS concode_elem_sep Map<ImmutableList<ChildNumber>,ChildNumber> lastPrivDerivedNumbers concode_elem_sep ImmutableList<ChildNumber> rootPath concode_elem_sep Map<ImmutableList<ChildNumber>,ChildNumber> lastPubDerivedNumbers concode_field_sep ChildNumber getNextChildNumberToDerive concode_elem_sep void putKey concode_elem_sep DeterministicKey get concode_elem_sep DeterministicKey deriveChild concode_elem_sep DeterministicKey deriveChild concode_elem_sep DeterministicKey deriveNextChild concode_elem_sep Map<ImmutableList<ChildNumber>,ChildNumber> getLastDerivedNumbers