python-trezor
=============

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Python library and commandline client for communicating with TREZOR
Hardware Wallet

See <https://trezor.io> for more information

Install
-------

Python-trezor requires Python 3.3 or higher, and libusb 1.0. The easiest
way to install it is with `pip`. The rest of this guide assumes you have
a working `pip`; if not, you can refer to [this
guide](https://packaging.python.org/tutorials/installing-packages/).

### Trezor T only

On a typical Linux / Mac / BSD system, you already have all you need.
Install `trezor` with:

```sh
pip3 install --upgrade setuptools
pip3 install trezor
```

On Windows, you also need to install
[libusb](https://github.com/libusb/libusb/wiki/Windows) and the
appropriate [drivers](https://zadig.akeo.ie/). This is, unfortunately, a
topic bigger than this README.

### Trezor One support

In addition to the above, you need to install development headers for
HIDAPI.

On a Debian or Ubuntu based system, you can install these:

```sh
sudo apt-get install python3-dev python3-pip cython3 libusb-1.0-0-dev libudev-dev
```

When installing the trezor library, you need to specify that you want
`hidapi`:

```sh
pip3 install --upgrade setuptools
pip3 install trezor[hidapi]
```

### Ethereum support

Ethereum requires additional python packages. Instead of
`pip3 install trezor`, specify `pip3 install trezor[ethereum]`.

You can combine it with the above, to get both HIDAPI and Ethereum
support:

```sh
pip3 install trezor[ethereum,hidapi]
```

### FreeBSD

On FreeBSD you can install the packages:

```sh
pkg install security/py-trezor
```

or build via ports:

```sh
cd /usr/ports/security/py-trezor
make install clean
```

Command line client (trezorctl)
------------------------------

The included `trezorctl` python script can perform various tasks such as
changing setting in the Trezor, signing transactions, retrieving account
info and addresses. See the [docs/](docs/) sub folder for detailed
examples and options.

NOTE: An older version of the `trezorctl` command is [available for
Debian Stretch](https://packages.debian.org/en/stretch/python-trezor)
(and comes pre-installed on [Tails OS](https://tails.boum.org/)).

Python Library
--------------

You can use this python library to interact with a Bitcoin Trezor and
use its capabilities in your application. See examples here in the
[tools/](tools/) sub folder.

PIN Entering
------------

When you are asked for PIN, you have to enter scrambled PIN. Follow the
numbers shown on TREZOR display and enter the their positions using the
numeric keyboard mapping:

<table>
<tr><td>7<td>8<td>9
<tr><td>4<td>5<td>6
<tr><td>1<td>2<td>3
</table>

Example: your PIN is **1234** and TREZOR is displaying the following:

<table>
<tr><td>2<td>8<td>3
<tr><td>5<td>4<td>6
<tr><td>7<td>9<td>1
</table>

You have to enter: **3795**

Contributing
------------

Python-trezor pulls coins info and protobuf messages from
[trezor-common](https://github.com/trezor/trezor-common) repository. If
you are developing new features for Trezor, you will want to start
there. Once your changes are accepted to `trezor-common`, you can make a
PR against this repository. Don't forget to update the submodule with:

```sh
git submodule update --init --remote
```

Then, rebuild the protobuf messages and get `coins.json` by running:

```sh
python3 setup.py prebuild
```

To get support for BTC-like coins, these steps are enough and no further
changes to the library are necessary.