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Python library and commandline client for communicating with TREZOR Hardware Wallet

See for more information


Python-trezor requires Python 3.5 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.

Quick installation

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

pip3 install --upgrade setuptools
pip3 install trezor

On Windows, you also need to install libusb and the appropriate drivers. This is, unfortunately, a topic bigger than this README.

Older Trezor One support

If your Trezor One is on firmware 1.6.3 or older, you will need HIDAPI support for it to be recognized. That requires additional packages.

Debian / Ubuntu

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

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


On a Windows based system, you can install these (for more info on choco, refer to this):

choco install vcbuildtools python3 protoc
pip3 install protobuf

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

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:

pip3 install trezor[ethereum,hidapi]


On FreeBSD you can install the packages:

pkg install security/py-trezor

or build via ports:

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

Building from source

Sometimes you might need to install the latest-and-greatest unreleased version straight from GitHub. You will need some prerequisites first:

sudo apt-get install protobuf-compiler protobuf-dev
pip3 install protobuf

If you just need to install the package, you can use pip again:

pip3 install git+

If you want to work on the sources, make a local clone:

git clone
cd python-trezor
python3 prebuild
python3 develop

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/ sub folder for detailed examples and options.

NOTE: An older version of the trezorctl command is available for Debian Stretch (and comes pre-installed on Tails OS).

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/ 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:

7 8 9
4 5 6
1 2 3

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

2 8 3
5 4 6
7 9 1

You have to enter: 3795


Python-trezor pulls coins info and protobuf messages from 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:

git submodule update --init --remote

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

python3 prebuild

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