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https://github.com/cashubtc/nutshell
Chaumian ecash wallet and mint for Bitcoin
https://github.com/cashubtc/nutshell
bitcoin ecash lightning-network privacy
Last synced: about 1 month ago
JSON representation
Chaumian ecash wallet and mint for Bitcoin
- Host: GitHub
- URL: https://github.com/cashubtc/nutshell
- Owner: cashubtc
- License: mit
- Created: 2022-09-11T01:26:19.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2024-04-13T08:31:06.000Z (8 months ago)
- Last Synced: 2024-04-13T22:05:54.668Z (8 months ago)
- Topics: bitcoin, ecash, lightning-network, privacy
- Language: Python
- Homepage: https://docs.cashu.space
- Size: 22.8 MB
- Stars: 302
- Watchers: 13
- Forks: 59
- Open Issues: 66
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE.md
Awesome Lists containing this project
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- awesome-cashu - Nutshell - to-script-hash (P2SH) tokens. (Wallets)
README
# Cashu Nutshell
**Nutshell is a Chaumian Ecash wallet and mint for Bitcoin Lightning based on the Cashu protocol.**
*Disclaimer: The author is NOT a cryptographer and this work has not been reviewed. This means that there is very likely a fatal flaw somewhere. Cashu is still experimental and not production-ready.*
Cashu is a free and open-source [Ecash protocol](https://github.com/cashubtc/nuts) based on David Wagner's variant of Chaumian blinding called [Blind Diffie-Hellman Key Exchange](https://cypherpunks.venona.com/date/1996/03/msg01848.html) scheme written down [here](https://gist.github.com/RubenSomsen/be7a4760dd4596d06963d67baf140406).
Cashu protocol ·
Quick Install ·
Manual install ·
Configuration ·
Using Cashu ·
Run a mint
### Feature overview
- Bitcoin Lightning support (LND, CLN, et al.)
- Full support for the Cashu protocol [specifications](https://github.com/cashubtc/nuts)
- Standalone CLI wallet and mint server
- Wallet and mint library you can include in other Python projects
- PostgreSQL and SQLite
- Wallet with builtin Tor
- Use multiple mints in a single wallet
### Advanced features
- Deterministic wallet with seed phrase backup
- Programmable ecash: P2PK and HTLCs
- Wallet and mint support for keyset rotations
- DLEQ proofs for offline transactions
- Send and receive tokens on nostr
## The Cashu protocol
Different Cashu clients and mints use the same protocol to achieve interoperability. See the [documentation page](https://docs.cashu.space/) for more information on other projects. If you are interested in developing on your own Cashu project, please refer to the protocol specs [protocol specs](https://github.com/cashubtc/nuts).
## Easy Install: Nutshell wallet
The easiest way to use Cashu is to install the package it via pip:
```bash
pip install cashu
```
To update Cashu, use `pip install cashu -U`.
If you have problems running the command above on Ubuntu, run `sudo apt install -y pip pkg-config` and `pip install wheel`. On macOS, you might have to run `pip install wheel` and `brew install pkg-config`.
You can skip the entire next section about Poetry and jump right to [Using Cashu](#using-cashu).
## Easy Install: Nutshell mint
The easiest way to get a mint running is through Docker.
You can build the image yourself by running the following command. Make sure to adjust the environment variables in `docker-compose.yaml`.
```bash
docker compose up mint
```
Alternatively, you can use the pre-built Docker images, see [Running a mint](#docker).
## Manual install: Poetry
These steps help you install Python via pyenv and Poetry. If you already have Poetry running on your computer, you can skip this step and jump right to [Install Cashu](#poetry-install-cashu).
#### Poetry: Prerequisites
```bash
# on ubuntu:
sudo apt install -y build-essential pkg-config libffi-dev libpq-dev zlib1g-dev libssl-dev python3-dev libsqlite3-dev ncurses-dev libbz2-dev libreadline-dev lzma-dev liblzma-dev
# install python using pyenv
curl https://pyenv.run | bash
# !! follow the instructions of pyenv init to setup pyenv !!
pyenv init
# restart your shell (or source your .rc file), then install python:
pyenv install 3.10.4
# install poetry
curl -sSL https://install.python-poetry.org | python3 -
echo export PATH=\"$HOME/.local/bin:$PATH\" >> ~/.bashrc
source ~/.bashrc
```
#### Poetry: Install Cashu
```bash
# install cashu
git clone https://github.com/cashubtc/nutshell.git cashu
cd cashu
git checkout
pyenv local 3.10.4
poetry install
```
#### Poetry: Update Cashu
To update Cashu to the newest version enter
```bash
git pull && poetry install
```
#### Poetry: Using the Nutshell wallet
Cashu should be now installed. To execute the following commands, activate your virtual Poetry environment via
```bash
poetry shell
```
If you don't activate your environment, just prepend `poetry run` to all following commands.
## Configuration
```bash
mv .env.example .env
# edit .env file
vim .env
```
To use the wallet with the [public test mint](#test-instance), you need to change the appropriate entries in the `.env` file.
#### Test instance
*Warning: this instance is just for demonstration purposes and development only. The satoshis are not real.*
Change the appropriate `.env` file settings to
```bash
MINT_URL=https://testnut.cashu.space
```
# Using Cashu
```bash
cashu info
```
This command shows information about your wallet.
#### Check balance
```bash
cashu balance
```
#### Generate a Lightning invoice
This command will return a Lightning invoice that you need to pay to mint new ecash tokens.
```bash
cashu invoice 420
```
The client will check every few seconds if the invoice has been paid. If you abort this step but still pay the invoice, you can use the command `cashu invoice --id `.
#### Pay a Lightning invoice
```bash
cashu pay lnbc120n1p3jfmdapp5r9jz...
```
#### Send tokens
To send tokens to another user, enter
```bash
cashu send 69
```
You should see the encoded token. Copy the token and send it to another user such as via email or a messenger. The token looks like this:
```bash
cashuAeyJwcm9vZnMiOiBbey...
```
#### Receive tokens
To receive tokens, another user enters:
```bash
cashu receive cashuAeyJwcm9vZnMiOiBbey...
```
# Starting the wallet API daemon
Nutshell wallet can be used in daemon mode that can be controlled through a REST API:
```bash
cashu -d
```
You can find the API docs at [http://localhost:4448/docs](http://localhost:4448/docs).
# Running a mint
This command runs the mint on your local computer. Skip this step if you want to use the [public test mint](#test-instance) instead.
## Docker
```
docker run -d -p 3338:3338 --name nutshell -e MINT_BACKEND_BOLT11_SAT=FakeWallet -e MINT_LISTEN_HOST=0.0.0.0 -e MINT_LISTEN_PORT=3338 -e MINT_PRIVATE_KEY=TEST_PRIVATE_KEY cashubtc/nutshell:0.16.3 poetry run mint
```
## From this repository
Before you can run your own mint, make sure to enable a Lightning backend in `MINT_BACKEND_BOLT11_SAT` and set `MINT_PRIVATE_KEY` in your `.env` file.
```bash
poetry run mint
```
For testing, you can use Nutshell without a Lightning backend by setting `MINT_BACKEND_BOLT11_SAT=FakeWallet` in the `.env` file.
# Running tests
To run the tests in this repository, first install the dev dependencies with
```bash
poetry install --with dev
```
Then, make sure to set up your mint's `.env` file to use a fake Lightning backend and disable Tor:
```bash
MINT_BACKEND_BOLT11_SAT=FakeWallet
TOR=FALSE
```
You can run the tests with
```bash
poetry run pytest tests
```
# Contributing
Developers are invited to contribute to Nutshell. Please see the [contribution guide](CONTRIBUTING.md).