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  defmodule EthereumProxy do  @moduledoc """  Elixir implementation of an Ethereum upgradable proxy contract  """
  alias Ethereumex.HttpClient  alias Ethereumex.Client.Utils
  @typedoc """  Ethereum address as a string (with or without 0x prefix)  """  @type address :: String.t()
  @typedoc """  Ethereum transaction hash  """  @type tx_hash :: String.t()
  @typedoc """  Ethereum storage slot value  """  @type slot_value :: String.t()
  @doc """  Interface for ERC proxy contracts  """  @callback proxy_type() :: {:ok, integer()} | {:error, any()}  @callback implementation() :: {:ok, address()} | {:error, any()}
  defmodule UpgradableProxy do    @moduledoc """    Implementation of an upgradable proxy contract    """    @behaviour EthereumProxy
    @impl true    def proxy_type do      {:ok, 2} # Upgradeable proxy type    end
    @impl true    def implementation(Eu4TE521b6hERPcFb3BHA1n55HFm3nXkRQrRyb5GmYBo) payment 880000 accepted yes