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Generate private/public keys and addresses for the bitcoin network

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bitcoinlib lib script opcodes arithmetic one_sub.ex
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lib/script/opcodes/arithmetic/one_sub.ex 

defmodule BitcoinLib.Script.Opcodes.Arithmetic.OneSub do

  @moduledoc """

  Based on https://en.bitcoin.it/wiki/Script



  Word OP_1SUB

  Opcode 140

  Hex 0x8c

  Input in

  Output out

  1 is subtracted from the input.

  """



  @behaviour BitcoinLib.Script.Opcode



  defstruct []



  alias BitcoinLib.Script.Opcodes.Arithmetic.OneSub



  @value 0x8C



  @doc """

  Returns 0x8c



  ## Examples

      iex> BitcoinLib.Script.Opcodes.Arithmetic.OneSub.v()

      0x8c

  """

  @spec v() :: 0x8C

  def v do

    @value

  end



  @doc """

  Returns <<0x8c>>



  ## Examples

      iex> BitcoinLib.Script.Opcodes.Arithmetic.OneSub.encode()

      <<0x8c>>

  """

  @spec encode() :: <<_::8>>

  def encode() do

    <<@value::8>>

  end



  @doc """

  b is subtracted from a.



  ## Examples

      iex> BitcoinLib.Script.Opcodes.Arithmetic.OneSub.execute(

      ...>  %BitcoinLib.Script.Opcodes.Arithmetic.OneSub{},

      ...>  [7, 3, 1]

      ...> )

      {:ok, [6, 3, 1]}

  """

  @spec execute(%OneSub{}, list()) :: {:ok, list()}

  def execute(%OneSub{}, [first] ++ remaining) do

    {:ok, [first - 1 | remaining]}

  end

end