@spec get(BitcoinLib.Key.PrivateKey.t(), BitcoinLib.Key.HD.DerivationPath.t()) ::
  {:ok, BitcoinLib.Key.PrivateKey.t()} | {:error, binary()}

Computes a private key from a derivation path

examples

Examples

iex> { :ok, derivation_path } = BitcoinLib.Key.HD.DerivationPath.parse("m/84'/0'/0'/0/0")
...> %BitcoinLib.Key.PrivateKey{
...>  key: <<0xF79BB0D317B310B261A55A8AB393B4C8A1ABA6FA4D08AEF379CABA502D5D67F9::256>>,
...>  chain_code: <<0x463223AAC10FB13F291A1BC76BC26003D98DA661CB76DF61E750C139826DEA8B::256>>
...> }
...> |> BitcoinLib.Key.PrivateKey.ChildFromDerivationPath.get(derivation_path)
{
  :ok,
  %BitcoinLib.Key.PrivateKey{
    key: <<0x210DDF6EA57B57C4607B17F9774C3F48AC92DA3AE5FF03D215CCE56AA021DAA6::256>>,
    chain_code: <<0x143B6DAC88591B42BD7D74AA193D4EFC7826873B4BD5F491B7067E705B8A626E::256>>,
    depth: 5,
    index: 0,
    parent_fingerprint: <<0xFFF4D449::32>>
  }
}