BIP-0173

Elixir implementation of Bitcoin's address format for native SegWit outputs.

Upstream GitHub repository: stampery/elixir-bip0173

About BIP-0173, BIP-0350 and Bech32 and Bech32m

BIP-0173 proposes a checksummed base32 format, "Bech32", and a standard for native segregated witness output addresses using it.

BIP-0141 defines Segregated Witness v0 and witness programs.

BIP-0350 Bech32m format for v1+ witness addresses.

You can find more information in the original proposal by @sipa and @gmaxwell.

Installation

1. Add bip0173 to your list of dependencies in mix.exs:

  def deps do
    [{:bip0173, "~> 0.1.2"}]
  end

How to use

You can find the full API reference and examples in the online documentation at Hexdocs.

Bech32

Encoding data to Bech32 and Bech32m string

iex> Bech32.encode("bech32", [0, 1, 2], :bech32)
"bech321qpz4nc4pe"

iex> Bech32.encode("bech32", [0, 1, 2], :bech32m)
"bech321qpzq0geym"

iex> Bech32.encode("bc", [0, 14, 20, 15, 7, 13, 26, 0, 25, 18, 6, 11, 13,
...> 8, 21, 4, 20, 3, 17, 2, 29, 3, 12, 29, 3, 4, 15, 24,20, 6, 14, 30, 22], :bech32)
"bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4"

Decoding data from Bech32 and Bech32m string

iex> Bech32.decode("bech321qpz4nc4pe")
{:ok, {"bech32", [0, 1, 2], :bech32}}

iex> Bech32.decode("bech321qpzq0geym")
{:ok, {"bech32", [0, 1, 2], :bech32m}}

iex> Bech32.decode("bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4")
{:ok, {"bc", [0, 14, 20, 15, 7, 13, 26, 0, 25, 18, 6, 11, 13, 8, 21,
  4, 20, 3, 17, 2, 29, 3, 12, 29, 3, 4, 15, 24, 20, 6, 14, 30, 22], :bech32}}

SegwitAddr

Encoding a SegWit program into BIP-0350 format

iex> SegwitAddr.encode("bc", "0014751e76e8199196d454941c45d1b3a323f1433bd6")
"bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4"

iex> SegwitAddr.encode("bc", 0, [117, 30, 118, 232, 25, 145, 150, 212,
...> 84, 148, 28, 69, 209, 179, 163, 35, 241, 67, 59, 214])
"bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4"

Decoding a BIP-0350 address into a SegWit program and formatting it as an hexadecimal ScriptPubKey

iex> SegwitAddr.decode("bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4")
{:ok, {"bc", 0, [117, 30, 118, 232, 25, 145, 150, 212,
84, 148, 28, 69, 209, 179, 163, 35, 241, 67, 59, 214]}}

iex> SegwitAddr.to_script_pub_key(0, [117, 30, 118, 232, 25, 145, 150,
...> 212, 84, 148, 28, 69, 209, 179, 163, 35, 241, 67, 59, 214])
"0014751e76e8199196d454941c45d1b3a323f1433bd6"

Development

Running tests

$ mix deps.get
$ mix test

Running static analysis

This package uses Erlang's dialyzer to find software discrepancies such as definite type errors, code which has become dead or unreachable due to some programming error, unnecessary tests, etc.

$ mix deps.get
$ mix dialyzer