Metadata-Version: 2.4
Name: pymatt
Version: 0.1.0
Summary: Merkleize All The Things
Author-email: Salvatore Ingala <salvatoshi@protonmail.com>
License:                                  Apache License
                                   Version 2.0, January 2004
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License-File: LICENSE
Keywords: bitcoin,covenant,smart contracts
Requires-Python: >=3.8
Requires-Dist: typing-extensions>=4.9.0
Provides-Extra: examples
Requires-Dist: prompt-toolkit<3.1,>=3.0.31; extra == 'examples'
Requires-Dist: python-dotenv==0.13.0; extra == 'examples'
Description-Content-Type: text/markdown

# pymatt

## WIP Python framework for MATT smart contracts

This repository contains a (very much Work In Progress) framework to create and test smart contracts using the `OP_CHECKCONTRACTVERIFY` opcode.

## Prerequisites

  * [python](https://www.python.org) (3.9+)
  * [pip](https://pypi.org/project/pip)
  * [docker](https://www.docker.com)

## Installing the library

Optionally, create a python environment:

```bash
$ python -m venv .venv
$ source .venv/bin/activate
```

Install the library with:

```bash
$ pip install pymatt
```

## Run bitcoin-inquisition MATT in regtest mode

The fastest way to get started is [this docker container](https://github.com/Merkleize/docker):

```bash
$ docker pull bigspider/bitcoin_matt
$ docker run -d -p 18443:18443 bigspider/bitcoin_matt
```

Alternatively, build the same yourself from [this branch](https://github.com/Merkleize/bitcoin/tree/inq-ccv). Here's the `bitcoin.conf` file used for these examples:

<details>
  <summary> <tt>bitcoin.conf</tt> </summary>

  ```
  regtest=1
  printtoconsole=1
  server=1
  txindex=1
  fallbackfee=0.00001
  minrelaytxfee=0
  blockmintxfee=0

  [regtest]
  rpcbind=0.0.0.0
  rpcallowip=0.0.0.0/0
  rpcuser=rpcuser
  rpcpassword=rpcpass
  ```
</details>

### Case studies

The `examples` folder contains some utility scripts to work with regtest bitcoin-core:
- [init.sh](examples/init.sh) creates/loads and funds a wallet named `testwallet`. Run it once before the
examples and you're good to go.
- [fund.sh](examples/fund.sh) that allows to fund a certain address.

The following examples are currently implemented

- [Vault](examples/vault) [cli]: an implementation of a vault, largely compatible with [OP_VAULT BIP-0345](https://github.com/bitcoin/bips/pull/1421).
- [Rock-Paper-Scissors](examples/rps) [cli]: play Rock-Paper-Scissors on bitcoin.
- [RAM](examples/ram) [cli]: a a contract that uses a Merkle tree to store a vector of arbitrary
length in size, with transitions that allow to modify one element of the vector.
- [game256](examples/game256): Implements an end-2-end execution of the toy example for fraud proofs [drafted in bitcoin-dev](https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-November/021205.html).

For the ones marked with [cli], a simple interactive tool allows to play with the contract.
More code examples can be found in the test suite.

## Docs

See the [docs](./docs) folder for high-level documentation on how to design smart contracts using MATT.

As the framework is still in development, we recommend looking at the code examples below for developer documentation on using pymatt.

## Contribution

### Prerequisites

The examples in this repository can be installed and set up using [uv](https://docs.astral.sh/uv).

If you do not have `uv` installed, run one of the following commands.

<details>
  <summary> Install using <tt>pipx</tt> </summary>

  ```bash
  pipx install uv
  ```
</details>

<details>
  <summary> Install using standalone installer (Darwin and Linux) </summary>

  ```bash
  curl -LsSf https://astral.sh/uv/install.sh | sh
  ```
</details>

<details>
  <summary> Install using Homebrew (Darwin) </summary>

  ```bash
  brew install uv
  ```
</details>

The following commands help you set up and activate a Python virtual environment where `uv` can download project dependencies from the `PyPI` open-sourced registry defined under `pyproject.toml` file.

<details>
  <summary> Set up environment and synchronize project dependencies </summary>

  ```bash
  git clone git@github.com:Merkleize/pymatt.git
  cd pymatt
  uv venv --python 3.9
  source .venv/bin/activate
  uv sync --dev
  ```
</details>

### Run examples

All the examples use the `RPC_USER`, `RPC_PASSWORD`, `RPC_HOST`, `RPC_PORT` environment variables
to set up a connection with the regtest bitcoin node; the default values are the same as set
in the container.

If they differ in your system, make sure to set them appropriately, or create a `.env` file
similar to the following:

```
RPC_HOST = "localhost"
RPC_USER = "rpcuser"
RPC_PASSWORD = "rpcpass"
RPC_PORT = "18443"
```

NOTE: the examples do not handle fee management and will send transactions with 0 fees; those
are rejected with the default settings of bitcoin-core.

If not using the container above, please see an [example of custom bitcoin.conf](https://github.com/Merkleize/docker/blob/master/bitcoin.conf)
to work with the scripts in this repository.

You can use the following command to install the extra dependencies required for
running the examples in the repository.

<details>
  <summary> Install dependencies for the examples </summary>

  ```bash
  uv sync --dev --extra examples
  ```
</details>

### Tests

This project uses `pytest` to run automated tests. Install the dependencies with:

```bash
uv sync --dev
```

The test suite requires a running instance of the MATT-enabled bitcoin-inquisition,
for example using the container above. The [init.sh](examples/init.sh) script makes
sure that a funded test wallet is loaded.

```bash
$ docker run -d -p 18443:18443 bigspider/bitcoin_matt
$ bash ./examples/init.sh
```

Then, run the tests with 

```bash
$ pytest
```

Refer to the [pytest documentation](https://docs.pytest.org/) for more advanced options.

### Report

Some tests produce additional illustrative info about the transactions produced during
the contract execution, in a Markdown report called `report.md`.
