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LBRYcrd - The LBRY blockchain

Build Status MIT licensed

LBRYcrd uses a blockchain similar to bitcoin's to implement an index and payment system for content on the LBRY network. It is a fork of bitcoin core. In addition to the libraries used by bitcoin, LBRYcrd also uses icu4c.

Please read the overview for a general understanding of the LBRY pieces. From there you could read the LBRY spec for specifics on the data in the blockchain.

Table of Contents

  1. Installation
  2. Usage
    1. Examples
    2. Data directory
  3. Running from Source
    1. Ubuntu with pulled static dependencies
    2. Ubuntu with local shared dependencies
    3. MacOS (cross-compiled)
    4. MacOS with local shared dependencies
    5. Windows (cross-compiled)
    6. Use with CLion
  4. Contributing
  5. Mailing List
  6. License
  7. Security
  8. Contact


Latest binaries are available from There is no installation procedure; the CLI binaries will run as-is and will have any uncommon dependencies statically linked into the binary. The QT GUI is not supported. LBRYcrd is distributed as a collection of executable files; traditional installers are not provided.


The lbrycrdd executable will start a LBRYcrd node and connect you to the LBRYcrd network. Use the lbrycrd-cli executable to interact with lbrycrdd through the command line. Command-line help for both executables are available through the "--help" flag (e.g. lbrycrdd --help). Examples:


Run ./lbrycrdd -server -daemon to start lbrycrdd in the background.

Run ./lbrycrd-cli -getinfo to check for some basic information about your LBRYcrd node.

Run ./lbrycrd-cli help to get a list of all commands that you can run. To get help on specific commands run ./lbrycrd-cli [command_name] help

Test locally:

./lbrycrdd -server -regtest -txindex  # run this in its own window
./lbrycrd-cli -regtest generate 120   # mine 20 spendable coins
./lbrycrd-cli -regtest claimname my_name deadbeef 1 # hold a name claim with 1 coin
./lbrycrd-cli -regtest generate 1     # get that claim into the block
./lbrycrd-cli -regtest listnameclaims # show owned claims
./lbrycrd-cli -regtest getclaimsforname my_name # show claims under that name
./lbrycrd-cli -regtest stop           # kill lbrycrdd
rm -fr ~/.lbrycrd/regtest/            # destroy regtest data

For further understanding of a "regtest" setup, see the local stack setup instructions here:

The CLI help is also browsable online at

Data directory

Lbrycrdd will use the below default data directories (changeable with -datadir):

Windows:  %APPDATA%\lbrycrd
Mac:      ~/Library/Application Support/lbrycrd
Unix:     ~/.lbrycrd

The data directory contains various things such as your default wallet (wallet.dat), debug logs (debug.log), and blockchain data. You can optionally create a configuration file lbrycrd.conf in the default data directory which will be used by default when running lbrycrdd.

For a list of configuration parameters, run ./lbrycrdd --help. Below is a sample lbrycrd.conf to enable JSON RPC server on lbrycrdd.


Running from Source

The easiest way to compile is to utilize the Docker image that contains the necessary compilers: lbry/build_lbrycrd. This will allow you to reproduce the build as made on our build servers. In this sample we map a local lbrycrd folder and a local ccache folder inside the image:

git clone
cd lbrycrd
docker run -v "$(pwd):/lbrycrd" --rm -v "${HOME}/ccache:/ccache" -w /lbrycrd -e CCACHE_DIR=/ccache lbry/build_lbrycrd packaging/

Some examples of compiling directly:

Ubuntu with pulled static dependencies

sudo apt install build-essential git libtool autotools-dev automake pkg-config bsdmainutils curl ca-certificates
git clone
cd lbrycrd

Other Linux distros would be similar. The build shell script is fairly trivial; take a peek at its contents.

Ubuntu with local shared dependencies

Note: using untested dependencies may lead to conflicting results.

sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install libdb4.8-dev libdb4.8++-dev libicu-dev libssl-dev libevent-dev \
                     build-essential git libtool autotools-dev automake pkg-config bsdmainutils curl ca-certificates \
                     libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev

# optionally include libminiupnpc-dev libzmq3-dev

git clone
cd lbrycrd
./configure --enable-static --disable-shared --with-pic --without-gui CXXFLAGS="-O3 -march=native"
make -j$(nproc)
./src/lbrycrdd -server ...

MacOS (cross-compiled)

sudo apt-get install clang llvm git libtool autotools-dev automake pkg-config bsdmainutils curl ca-certificates \
                     libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev

git clone
cd lbrycrd
# download MacOS SDK from your favorite source
mkdir depends/SDKs
tar ... extract SDK to depends/SDKs/MacOSX10.11.sdk

Look in packaging/ for further understanding.

MacOS with local shared dependencies

brew install boost berkeley-db@4 icu4c libevent
# fix conflict with gawk pulled first:
brew reinstall readline
brew reinstall gawk

git clone
cd lbrycrd/depends
make NO_QT=1
cd ..
CONFIG_SITE=$(pwd)/depends/x86_64-apple-darwin15.6.0/share/ ./configure --enable-static --disable-shared --with-pic --without-gui --enable-reduce-exports CXXFLAGS=-O2
make -j$(sysctl -n hw.ncpu)

Windows (cross-compiled)

Compiling on MS Windows (outside of WSL) is not supported. The Windows build is cross-compiled from Linux like so:

sudo apt-get install build-essential git libtool autotools-dev automake pkg-config bsdmainutils curl ca-certificates \
                     g++-mingw-w64-x86-64 mingw-w64-x86-64-dev

update-alternatives --set x86_64-w64-mingw32-g++ /usr/bin/x86_64-w64-mingw32-g++-posix

git clone
cd lbrycrd

If you encounter any errors, please check doc/build-*.md for further instructions. If you're still stuck, create an issue with the output of that command, your system info, and any other information you think might be helpful. The scripts in the packaging folder are simple and will grant extra light on the build process as needed.

Use with CLion

CLion has not traditionally supported Autotools projects, although some progress on that is now in the works. We do include a cmake build file for compiling lbrycrd. See contrib/cmake. Alas, CLion doesn't support external projects in cmake, so that particular approach is also insufficient. CLion does support "compile_commands.json" projects. Fortunately, this can be easily generated for lbrycrd like so:

pip install --user compiledb
./ && ./configure --enable-static=no --enable-shared --with-pic --without-gui CXXFLAGS="-O0 -g" CFLAGS="-O0 -g" # or whatever normal lbrycrd config
compiledb make -j10

Then open the newly generated compile_commands.json file as a project in CLion. Debugging is supported if you compiled with -g. To enable that you will need to create a target in CLion by going to File -> Settings -> Build -> Custom Build Targets. Add an empty target with your choice of name. From there you can go to "Edit Configurations", typically found in a drop-down at the top of the editor. Add a Custom Build Application, select your new target, select the compiled file (i.e. test_lbrycrd or lbrycrdd, etc), and then add any necessary command line parameters. Ensure that there is nothing in the "Before launch" section.


Contributions to this project are welcome, encouraged, and compensated. For more details, see

We follow the same coding guidelines as documented by Bitcoin Core, see here. To run an automated code formatting check, try: git diff -U0 master -- '*.h' '*.cpp' | ./contrib/devtools/ -p1. This will check any commits not on master for proper code formatting. We try to avoid altering parts of the code that is inherited from Bitcoin Core unless absolutely necessary. This will make it easier to merge changes from Bitcoin Core. If commits are expected not to be merged upstream (i.e. we broke up a commit from Bitcoin Core in order to use a single feature in it), the commit message must contain the string "NOT FOR UPSTREAM MERGE".

The master branch is regularly built and tested, but is not guaranteed to be completely stable. Releases are created regularly to indicate new official, stable release versions.

Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money. Developers are strongly encouraged to write unit tests for new code and to submit new unit tests for old code. Unit tests are compiled by default and can be run with src/test/test_lbrycrd

The Travis CI system makes sure that every pull request is built, and that unit and sanity tests are automatically run. See


Testnet is maintained for testing purposes and can be accessed using the command ./lbrycrdd -testnet. If you would like to obtain testnet credits, please contact or .

It is easy to solo mine on testnet. (It's easy on mainnet too, but much harder to win.) For instructions see SGMiner and Mining Contributions

Mailing List

We maintain a mailing list for notifications of upgrades, security issues, and soft/hard forks. To join, visit


This project is MIT licensed. For the full license, see LICENSE.


We take security seriously. Please contact regarding any security issues. Our PGP key is here if you need it.


The primary contact for this project is @BrannonKing (