2eec7e1600
Previously this function would not switch to a different chain if the current chain contained the preferred block. This was not the intended behaviour: if there is a *stronger* chain that *also* contains the preferred block, we should jump to that. Note that with this commit there will now always be a preferred block (defaults to genesis). Previously, it might seem that often there was none, but actually in practice if the user used the GUI context menu to switch servers even once, there was one (usually genesis). Hence, with the old code, if an attacker mined a single header which then got reorged, auto_connect clients which were connected to the attacker's server would never switch servers (jump chains) even without the user explicitly configuring preference for the stale branch.
Electrum - Lightweight Bitcoin client
=====================================
::
Licence: MIT Licence
Author: Thomas Voegtlin
Language: Python (>= 3.6)
Homepage: https://electrum.org/
.. image:: https://travis-ci.org/spesmilo/electrum.svg?branch=master
:target: https://travis-ci.org/spesmilo/electrum
:alt: Build Status
.. image:: https://coveralls.io/repos/github/spesmilo/electrum/badge.svg?branch=master
:target: https://coveralls.io/github/spesmilo/electrum?branch=master
:alt: Test coverage statistics
.. image:: https://d322cqt584bo4o.cloudfront.net/electrum/localized.svg
:target: https://crowdin.com/project/electrum
:alt: Help translate Electrum online
Getting started
===============
(*If you've come here looking to simply run Electrum,* `you may download it here`_.)
.. _you may download it here: https://electrum.org/#download
Electrum itself is pure Python, and so are most of the required dependencies,
but not everything. The following sections describe how to run from source, but here
is a TL;DR::
sudo apt-get install libsecp256k1-0
python3 -m pip install --user .[gui,crypto]
Not pure-python dependencies
----------------------------
If you want to use the Qt interface, install the Qt dependencies::
sudo apt-get install python3-pyqt5
For elliptic curve operations, `libsecp256k1`_ is a required dependency::
sudo apt-get install libsecp256k1-0
Alternatively, when running from a cloned repository, a script is provided to build
libsecp256k1 yourself::
sudo apt-get install automake libtool
./contrib/make_libsecp256k1.sh
Due to the need for fast symmetric ciphers, either one of `pycryptodomex`_
or `cryptography`_ is required. Install from your package manager
(or from pip)::
sudo apt-get install python3-cryptography
If you would like hardware wallet support, see `this`_.
.. _libsecp256k1: https://github.com/bitcoin-core/secp256k1
.. _pycryptodomex: https://github.com/Legrandin/pycryptodome
.. _cryptography: https://github.com/pyca/cryptography
.. _this: https://github.com/spesmilo/electrum-docs/blob/master/hardware-linux.rst
Running from tar.gz
-------------------
If you downloaded the official package (tar.gz), you can run
Electrum from its root directory without installing it on your
system; all the pure python dependencies are included in the 'packages'
directory. To run Electrum from its root directory, just do::
./run_electrum
You can also install Electrum on your system, by running this command::
sudo apt-get install python3-setuptools python3-pip
python3 -m pip install --user .
This will download and install the Python dependencies used by
Electrum instead of using the 'packages' directory.
It will also place an executable named :code:`electrum` in :code:`~/.local/bin`,
so make sure that is on your :code:`PATH` variable.
Development version (git clone)
-------------------------------
Check out the code from GitHub::
git clone git://github.com/spesmilo/electrum.git
cd electrum
git submodule update --init
Run install (this should install dependencies)::
python3 -m pip install --user -e .
Create translations (optional)::
sudo apt-get install python-requests gettext
./contrib/pull_locale
Finally, to start Electrum::
./run_electrum
Creating Binaries
=================
Linux (tarball)
---------------
See :code:`contrib/build-linux/sdist/README.md`.
Linux (AppImage)
----------------
See :code:`contrib/build-linux/appimage/README.md`.
Mac OS X / macOS
----------------
See :code:`contrib/osx/README.md`.
Windows
-------
See :code:`contrib/build-wine/README.md`.
Android
-------
See :code:`contrib/android/Readme.md`.