Nejcoin

Copyright (c) 2019-2019 Nejcraft.
Copyright (c) 2014-2019 The Monero Project.
Portions Copyright (c) 2012-2013 The Cryptonote developers.

Table of Contents

• Development resources
• Vulnerability response
• Research
• Announcements
• Translations
• Build
  • IMPORTANT
• Coverage
• Introduction
• About this project
• Supporting the project
• License
• Contributing
• Scheduled software upgrades
• Release staging schedule and protocol
• Compiling Nejcoin from source
  • Dependencies

Development resources

• Web: getnejcoin.org
• Forum: forum.getnejcoin.org
• Mail: dev@getnejcoin.org
• GitHub: https://github.com/honzapatCZ/nejcoin
• IRC: #nejcoin-dev on Freenode

Vulnerability response

• Our Vulnerability Response Process encourages responsible disclosure
• We are also available via HackerOne

Research

The Nejcoin Research Lab is an open forum where the community coordinates research into Nejcoin cryptography, protocols, fungibility, analysis, and more. We welcome collaboration and contributions from outside researchers! Because not all Lab work and publications are distributed as traditional preprints or articles, they may be easy to miss if you are conducting literature reviews for your own Nejcoin research. You are encouraged to get in touch with our researchers if you have questions, wish to collaborate, or would like guidance to help avoid unnecessarily duplicating earlier or known work.

Our researchers are available on IRC in #nejcoin-research-lab on Freenode or by email:

• Sarang Noether, Ph.D.: sarang@getnejcoin.org or sarang.noether@protonmail.com; research repository
• Surae Noether (Brandon Goodell), Ph.D.: surae@getnejcoin.org or surae.noether@protonmail.com; research repository

Announcements

• You can subscribe to an announcement listserv to get critical announcements from the Nejcoin core team. The announcement list can be very helpful for knowing when software updates are needed.

Translations

The CLI wallet is available in different languages. If you want to help translate it, see our self-hosted localization platform, Pootle, on translate.getnejcoin.org. Every translation must be uploaded on the platform, pull requests directly editing the code in this repository will be closed. If you need help with Pootle, you can find a guide with screenshots here.  

If you need help/support/info about translations, contact the localization workgroup. You can find the complete list of contacts on the repository of the workgroup: nejcoin-translations.

Build

IMPORTANT

These builds are of the master branch, which is used for active development and can be either unstable or incompatible with release software. Please compile release branches.

Operating System	Processor	Status
Ubuntu 16.04	i686
Ubuntu 16.04	amd64
Ubuntu 16.04	armv7
Debian Stable	armv8
macOS 10.11	amd64
macOS 10.12	amd64
macOS 10.13	amd64
FreeBSD 11	amd64
DragonFly BSD 4.6	amd64
Windows (MSYS2/MinGW)	i686
Windows (MSYS2/MinGW)	amd64

Coverage

Type	Status
Coverity
Coveralls
License

Introduction

Nejcoin is a private, secure, untraceable, decentralised digital currency. You are your bank, you control your funds, and nobody can trace your transfers unless you allow them to do so.

Privacy: Nejcoin uses a cryptographically sound system to allow you to send and receive funds without your transactions being easily revealed on the blockchain (the ledger of transactions that everyone has). This ensures that your purchases, receipts, and all transfers remain absolutely private by default.

Security: Using the power of a distributed peer-to-peer consensus network, every transaction on the network is cryptographically secured. Individual wallets have a 25 word mnemonic seed that is only displayed once, and can be written down to backup the wallet. Wallet files are encrypted with a passphrase to ensure they are useless if stolen.

Untraceability: By taking advantage of ring signatures, a special property of a certain type of cryptography, Nejcoin is able to ensure that transactions are not only untraceable, but have an optional measure of ambiguity that ensures that transactions cannot easily be tied back to an individual user or computer.

Decentralization: The utility of nejcoin depends on its decentralised peer-to-peer consensus network - anyone should be able to run the nejcoin software, validate the integrity of the blockchain, and participate in all aspects of the nejcoin network using consumer-grade commodity hardware. Decentralization of the nejcoin network is maintained by software development that minimizes the costs of running the nejcoin software and inhibits the proliferation of specialized, non-commodity hardware.

About this project

This is the core implementation of Nejcoin. It is open source and completely free to use without restrictions, except for those specified in the license agreement below. There are no restrictions on anyone creating an alternative implementation of Nejcoin that uses the protocol and network in a compatible manner.

As with many development projects, the repository on Github is considered to be the "staging" area for the latest changes. Before changes are merged into that branch on the main repository, they are tested by individual developers in their own branches, submitted as a pull request, and then subsequently tested by contributors who focus on testing and code reviews. That having been said, the repository should be carefully considered before using it in a production environment, unless there is a patch in the repository for a particular show-stopping issue you are experiencing. It is generally a better idea to use a tagged release for stability.

Anyone is welcome to contribute to Nejcoin's codebase! If you have a fix or code change, feel free to submit it as a pull request directly to the "master" branch. In cases where the change is relatively small or does not affect other parts of the codebase it may be merged in immediately by any one of the collaborators. On the other hand, if the change is particularly large or complex, it is expected that it will be discussed at length either well in advance of the pull request being submitted, or even directly on the pull request.

Supporting the project

Nejcoin is a 100% community-sponsored endeavor. If you want to join our efforts, the easiest thing you can do is support the project financially. Nejcoin donations can be made to donate.getnejcoin.org if using a client that supports the OpenAlias standard. Alternatively you can send NEJC to the Nejcoin donation address via the donate command (type help in the command-line wallet for details).

The Nejcoin donation address is: NLVbnG3MFTK7kiv1ZrsZs6gmF2eczrUne82xwogUHFJQZjBtLjYLhEHS6Qb58vGyp5cbBixtMRcnFY7QjnPDTsWP2nfp66G

License

See LICENSE.

Contributing

If you want to help out, see CONTRIBUTING for a set of guidelines.

Scheduled software upgrades

Nejcoin uses a fixed-schedule software upgrade (hard fork) mechanism to implement new features. This means that users of Nejcoin (end users and service providers) should run current versions and upgrade their software on a regular schedule. Software upgrades occur during the months of April and October. The required software for these upgrades will be available prior to the scheduled date. Please check the repository prior to this date for the proper Nejcoin software version. Below is the historical schedule and the projected schedule for the next upgrade. Dates are provided in the format YYYY-MM-DD.

Software upgrade block height	Date	Fork version	Minimum Nejcoin version	Recommended Nejcoin version	Details
1009827	2016-03-22	v2	v0.9.4	v0.9.4	Allow only >= ringsize 3, blocktime = 120 seconds, fee-free blocksize 60 kb
1141317	2016-09-21	v3	v0.9.4	v0.10.0	Splits coinbase into denominations
1220516	2017-01-05	v4	v0.10.1	v0.10.2.1	Allow normal and RingCT transactions
1288616	2017-04-15	v5	v0.10.3.0	v0.10.3.1	Adjusted minimum blocksize and fee algorithm
1400000	2017-09-16	v6	v0.11.0.0	v0.11.0.0	Allow only RingCT transactions, allow only >= ringsize 5
1546000	2018-04-06	v7	v0.12.0.0	v0.12.3.0	Cryptonight variant 1, ringsize >= 7, sorted inputs
1685555	2018-10-18	v8	v0.13.0.0	v0.13.0.4	max transaction size at half the penalty free block size, bulletproofs enabled, cryptonight variant 2, fixed ringsize 11
1686275	2018-10-19	v9	v0.13.0.0	v0.13.0.4	bulletproofs required
1788000	2019-03-09	v10	v0.14.0.0	v0.14.1.2	New PoW based on Cryptonight-R, new block weight algorithm, slightly more efficient RingCT format
1788720	2019-03-10	v11	v0.14.0.0	v0.14.1.2	forbid old RingCT transaction format
XXXXXXX	2019-10-XX	XX	XXXXXXXXX	XXXXXXXXX	X

X's indicate that these details have not been determined as of commit date.

Release staging schedule and protocol

Approximately three months prior to a scheduled software upgrade, a branch from Master will be created with the new release version tag. Pull requests that address bugs should then be made to both Master and the new release branch. Pull requests that require extensive review and testing (generally, optimizations and new features) should not be made to the release branch.

Compiling Nejcoin from source

Dependencies

The following table summarizes the tools and libraries required to build. A few of the libraries are also included in this repository (marked as "Vendored"). By default, the build uses the library installed on the system, and ignores the vendored sources. However, if no library is found installed on the system, then the vendored source will be built and used. The vendored sources are also used for statically-linked builds because distribution packages often include only shared library binaries (.so) but not static library archives (.a).

Dep	Min. version	Vendored	Debian/Ubuntu pkg	Arch pkg	Fedora	Optional	Purpose
GCC	4.7.3	NO	build-essential	base-devel	gcc	NO
CMake	3.5	NO	cmake	cmake	cmake	NO
pkg-config	any	NO	pkg-config	base-devel	pkgconf	NO
Boost	1.58	NO	libboost-all-dev	boost	boost-devel	NO	C++ libraries
OpenSSL	basically any	NO	libssl-dev	openssl	openssl-devel	NO	sha256 sum
libzmq	3.0.0	NO	libzmq3-dev	zeromq	cppzmq-devel	NO	ZeroMQ library
OpenPGM	?	NO	libpgm-dev	libpgm	openpgm-devel	NO	For ZeroMQ
libnorm[2]	?	NO	libnorm-dev		`	YES	For ZeroMQ
libunbound	1.4.16	YES	libunbound-dev	unbound	unbound-devel	NO	DNS resolver
libsodium	?	NO	libsodium-dev	libsodium	libsodium-devel	NO	cryptography
libunwind	any	NO	libunwind8-dev	libunwind	libunwind-devel	YES	Stack traces
liblzma	any	NO	liblzma-dev	xz	xz-devel	YES	For libunwind
libreadline	6.3.0	NO	libreadline6-dev	readline	readline-devel	YES	Input editing
ldns	1.6.17	NO	libldns-dev	ldns	ldns-devel	YES	SSL toolkit
expat	1.1	NO	libexpat1-dev	expat	expat-devel	YES	XML parsing
GTest	1.5	YES	libgtest-dev[1]	gtest	gtest-devel	YES	Test suite
Doxygen	any	NO	doxygen	doxygen	doxygen	YES	Documentation
Graphviz	any	NO	graphviz	graphviz	graphviz	YES	Documentation

[1] On Debian/Ubuntu libgtest-dev only includes sources and headers. You must build the library binary manually. This can be done with the following command sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libg* /usr/lib/ [2] libnorm-dev is needed if your zmq library was built with libnorm, and not needed otherwise

Install all dependencies at once on Debian/Ubuntu:

sudo apt update && sudo apt install build-essential cmake pkg-config libboost-all-dev libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libldns-dev libexpat1-dev doxygen graphviz libpgm-dev

Install all dependencies at once on macOS with the provided Brewfile: brew update && brew bundle --file=contrib/brew/Brewfile

FreeBSD one liner for required to build dependencies pkg install git gmake cmake pkgconf boost-libs cppzmq libsodium

Cloning the repository

Clone recursively to pull-in needed submodule(s):

$ git clone --recursive https://github.com/honzapatCZ/nejcoin

If you already have a repo cloned, initialize and update:

$ cd nejcoin && git submodule init && git submodule update

Build instructions

Nejcoin uses the CMake build system and a top-level Makefile that invokes cmake commands as needed.

On Linux and macOS

• Install the dependencies

• Change to the root of the source code directory, change to the most recent release branch, and build:

  cd nejcoin
  git checkout release-v0.14
  make

  Optional: If your machine has several cores and enough memory, enable parallel build by running make -j<number of threads> instead of make. For this to be worthwhile, the machine should have one core and about 2GB of RAM available per thread.

  Note: If cmake can not find zmq.hpp file on macOS, installing zmq.hpp from https://github.com/zeromq/cppzmq to /usr/local/include should fix that error.

  Note: The instructions above will compile the most stable release of the Nejcoin software. If you would like to use and test the most recent software, use git checkout master. The master branch may contain updates that are both unstable and incompatible with release software, though testing is always encouraged.

• The resulting executables can be found in build/release/bin

• Add PATH="$PATH:$HOME/nejcoin/build/release/bin" to .profile

• Run Nejcoin with nejcoind --detach

• Optional: build and run the test suite to verify the binaries:

  make release-test

  NOTE: core_tests test may take a few hours to complete.

• Optional: to build binaries suitable for debugging:

  make debug

• Optional: to build statically-linked binaries:

  make release-static

Dependencies need to be built with -fPIC. Static libraries usually aren't, so you may have to build them yourself with -fPIC. Refer to their documentation for how to build them.

• Optional: build documentation in doc/html (omit HAVE_DOT=YES if graphviz is not installed):

  HAVE_DOT=YES doxygen Doxyfile

On the Raspberry Pi

Tested on a Raspberry Pi Zero with a clean install of minimal Raspbian Stretch (2017-09-07 or later) from https://www.raspberrypi.org/downloads/raspbian/. If you are using Raspian Jessie, please see note in the following section.

• apt-get update && apt-get upgrade to install all of the latest software

• Install the dependencies for Nejcoin from the 'Debian' column in the table above.

• Increase the system swap size:

  sudo /etc/init.d/dphys-swapfile stop  
  sudo nano /etc/dphys-swapfile  
  CONF_SWAPSIZE=2048
  sudo /etc/init.d/dphys-swapfile start

• If using an external hard disk without an external power supply, ensure it gets enough power to avoid hardware issues when syncing, by adding the line "max_usb_current=1" to /boot/config.txt

• Clone nejcoin and checkout the most recent release version:

  git clone https://github.com/honzapatCZ/nejcoin.git
  cd nejcoin
  git checkout tags/v0.14.1.2

• Build:

  make release

• Wait 4-6 hours

• The resulting executables can be found in build/release/bin

• Add PATH="$PATH:$HOME/nejcoin/build/release/bin" to .profile

• Run Nejcoin with nejcoind --detach

• You may wish to reduce the size of the swap file after the build has finished, and delete the boost directory from your home directory

Note for Raspbian Jessie users:

If you are using the older Raspbian Jessie image, compiling Nejcoin is a bit more complicated. The version of Boost available in the Debian Jessie repositories is too old to use with Nejcoin, and thus you must compile a newer version yourself. The following explains the extra steps, and has been tested on a Raspberry Pi 2 with a clean install of minimal Raspbian Jessie.

• As before, apt-get update && apt-get upgrade to install all of the latest software, and increase the system swap size

  sudo /etc/init.d/dphys-swapfile stop
  sudo nano /etc/dphys-swapfile
  CONF_SWAPSIZE=2048
  sudo /etc/init.d/dphys-swapfile start

• Then, install the dependencies for Nejcoin except libunwind and libboost-all-dev

• Install the latest version of boost (this may first require invoking apt-get remove --purge libboost* to remove a previous version if you're not using a clean install):

  cd
  wget https://sourceforge.net/projects/boost/files/boost/1.64.0/boost_1_64_0.tar.bz2
  tar xvfo boost_1_64_0.tar.bz2
  cd boost_1_64_0
  ./bootstrap.sh
  sudo ./b2

• Wait ~8 hours

  sudo ./bjam cxxflags=-fPIC cflags=-fPIC -a install

• Wait ~4 hours

• From here, follow the general Raspberry Pi instructions from the "Clone nejcoin and checkout most recent release version" step.

On Windows:

Binaries for Windows are built on Windows using the MinGW toolchain within MSYS2 environment. The MSYS2 environment emulates a POSIX system. The toolchain runs within the environment and cross-compiles binaries that can run outside of the environment as a regular Windows application.

Note that if you have msys installed somewhere else than c:/msys64 or c:/msys32 as me which have it on e:/Programy/msys64 you will have to tweak MakeFile to make it work with your configuration

Preparing the build environment

• Download and install the MSYS2 installer, either the 64-bit or the 32-bit package, depending on your system.

• Open the MSYS shell via the MSYS2 Shell shortcut

• Update packages using pacman:

  pacman -Syu

• Exit the MSYS shell using Alt+F4

• Edit the properties for the MSYS2 Shell shortcut changing "msys2_shell.bat" to "msys2_shell.cmd -mingw64" for 64-bit builds or "msys2_shell.cmd -mingw32" for 32-bit builds

• Restart MSYS shell via modified shortcut and update packages again using pacman:

  pacman -Syu

• Install dependencies:

  To build for 64-bit Windows:

  pacman -S mingw-w64-x86_64-toolchain make mingw-w64-x86_64-cmake mingw-w64-x86_64-boost mingw-w64-x86_64-openssl mingw-w64-x86_64-zeromq mingw-w64-x86_64-libsodium mingw-w64-x86_64-hidapi

  To build for 32-bit Windows:

  pacman -S mingw-w64-i686-toolchain make mingw-w64-i686-cmake mingw-w64-i686-boost mingw-w64-i686-openssl mingw-w64-i686-zeromq mingw-w64-i686-libsodium mingw-w64-i686-hidapi

• Open the MingW shell via MinGW-w64-Win64 Shell shortcut on 64-bit Windows or MinGW-w64-Win64 Shell shortcut on 32-bit Windows. Note that if you are running 64-bit Windows, you will have both 64-bit and 32-bit MinGW shells.

Cloning

• To git clone, run:

  git clone --recursive https://github.com/honzapatCZ/nejcoin.git

Building

• Change to the cloned directory, run:

  cd nejcoin

• If you would like a specific version/tag, do a git checkout for that version. eg. 'v0.14.1.2'. If you don't care about the version and just want binaries from master, skip this step:

  git checkout v0.14.1.2

• If you are on a 64-bit system, run:

  make release-static-win64

• If you are on a 32-bit system, run:

  make release-static-win32

• The resulting executables can be found in build/release/bin

• Optional: to build Windows binaries suitable for debugging on a 64-bit system, run:

  make debug-static-win64

• Optional: to build Windows binaries suitable for debugging on a 32-bit system, run:

  make debug-static-win32

• The resulting executables can be found in build/debug/bin

On FreeBSD:

The project can be built from scratch by following instructions for Linux above(but use gmake instead of make). If you are running nejcoin in a jail you need to add the flag: allow.sysvipc=1 to your jail configuration, otherwise lmdb will throw the error message: Failed to open lmdb environment: Function not implemented.

We expect to add Nejcoin into the ports tree in the near future, which will aid in managing installations using ports or packages.

On OpenBSD:

OpenBSD < 6.2

This has been tested on OpenBSD 5.8.

You will need to add a few packages to your system. pkg_add db cmake gcc gcc-libs g++ gtest.

The doxygen and graphviz packages are optional and require the xbase set.

The Boost package has a bug that will prevent librpc.a from building correctly. In order to fix this, you will have to Build boost yourself from scratch. Follow the directions here (under "Building Boost"): https://github.com/bitcoin/bitcoin/blob/master/doc/build-openbsd.md

You will have to add the serialization, date_time, and regex modules to Boost when building as they are needed by Nejcoin.

To build: env CC=egcc CXX=eg++ CPP=ecpp DEVELOPER_LOCAL_TOOLS=1 BOOST_ROOT=/path/to/the/boost/you/built make release-static-64

OpenBSD 6.2 and 6.3

You will need to add a few packages to your system. pkg_add cmake zeromq libiconv.

The doxygen and graphviz packages are optional and require the xbase set.

Build the Boost library using clang. This guide is derived from: https://github.com/bitcoin/bitcoin/blob/master/doc/build-openbsd.md

We assume you are compiling with a non-root user and you have doas enabled.

Note: do not use the boost package provided by OpenBSD, as we are installing boost to /usr/local.

# Create boost building directory
mkdir ~/boost
cd ~/boost

# Fetch boost source
ftp -o boost_1_64_0.tar.bz2 https://netcologne.dl.sourceforge.net/project/boost/boost/1.64.0/boost_1_64_0.tar.bz2

# MUST output: (SHA256) boost_1_64_0.tar.bz2: OK
echo "7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332 boost_1_64_0.tar.bz2" | sha256 -c
tar xfj boost_1_64_0.tar.bz2

# Fetch and apply boost patches, required for OpenBSD
ftp -o boost_test_impl_execution_monitor_ipp.patch https://raw.githubusercontent.com/openbsd/ports/bee9e6df517077a7269ff0dfd57995f5c6a10379/devel/boost/patches/patch-boost_test_impl_execution_monitor_ipp
ftp -o boost_config_platform_bsd_hpp.patch https://raw.githubusercontent.com/openbsd/ports/90658284fb786f5a60dd9d6e8d14500c167bdaa0/devel/boost/patches/patch-boost_config_platform_bsd_hpp

# MUST output: (SHA256) boost_config_platform_bsd_hpp.patch: OK
echo "1f5e59d1154f16ee1e0cc169395f30d5e7d22a5bd9f86358f738b0ccaea5e51d boost_config_platform_bsd_hpp.patch" | sha256 -c
# MUST output: (SHA256) boost_test_impl_execution_monitor_ipp.patch: OK
echo "30cec182a1437d40c3e0bd9a866ab5ddc1400a56185b7e671bb3782634ed0206 boost_test_impl_execution_monitor_ipp.patch" | sha256 -c

cd boost_1_64_0
patch -p0 < ../boost_test_impl_execution_monitor_ipp.patch
patch -p0 < ../boost_config_platform_bsd_hpp.patch

# Start building boost
echo 'using clang : : c++ : <cxxflags>"-fvisibility=hidden -fPIC" <linkflags>"" <archiver>"ar" <striper>"strip"  <ranlib>"ranlib" <rc>"" : ;' > user-config.jam
./bootstrap.sh --without-icu --with-libraries=chrono,filesystem,program_options,system,thread,test,date_time,regex,serialization,locale --with-toolset=clang
./b2 toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++" -sICONV_PATH=/usr/local
doas ./b2 -d0 runtime-link=shared threadapi=pthread threading=multi link=static variant=release --layout=tagged --build-type=complete --user-config=user-config.jam -sNO_BZIP2=1 -sICONV_PATH=/usr/local --prefix=/usr/local install

Build the cppzmq bindings.

We assume you are compiling with a non-root user and you have doas enabled.

# Create cppzmq building directory
mkdir ~/cppzmq
cd ~/cppzmq

# Fetch cppzmq source
ftp -o cppzmq-4.2.3.tar.gz https://github.com/zeromq/cppzmq/archive/v4.2.3.tar.gz

# MUST output: (SHA256) cppzmq-4.2.3.tar.gz: OK
echo "3e6b57bf49115f4ae893b1ff7848ead7267013087dc7be1ab27636a97144d373 cppzmq-4.2.3.tar.gz" | sha256 -c
tar xfz cppzmq-4.2.3.tar.gz

# Start building cppzmq
cd cppzmq-4.2.3
mkdir build
cd build
cmake ..
doas make install

Build nejcoin:

env DEVELOPER_LOCAL_TOOLS=1 BOOST_ROOT=/usr/local make release-static

OpenBSD >= 6.4

You will need to add a few packages to your system. pkg_add cmake gmake zeromq cppzmq libiconv boost.

The doxygen and graphviz packages are optional and require the xbase set.

Build nejcoin: env DEVELOPER_LOCAL_TOOLS=1 BOOST_ROOT=/usr/local gmake release-static

Note: you may encounter the following error, when compiling the latest version of nejcoin as a normal user:

LLVM ERROR: out of memory
c++: error: unable to execute command: Abort trap (core dumped)

Then you need to increase the data ulimit size to 2GB and try again: ulimit -d 2000000

On Solaris:

The default Solaris linker can't be used, you have to install GNU ld, then run cmake manually with the path to your copy of GNU ld:

mkdir -p build/release
cd build/release
cmake -DCMAKE_LINKER=/path/to/ld -D CMAKE_BUILD_TYPE=Release ../..
cd ../..

Then you can run make as usual.

On Linux for Android (using docker):

# Build image (for ARM 32-bit)
docker build -f utils/build_scripts/android32.Dockerfile -t nejcoin-android .
# Build image (for ARM 64-bit)
docker build -f utils/build_scripts/android64.Dockerfile -t nejcoin-android .
# Create container
docker create -it --name nejcoin-android nejcoin-android bash
# Get binaries
docker cp nejcoin-android:/src/build/release/bin .

Building portable statically linked binaries

By default, in either dynamically or statically linked builds, binaries target the specific host processor on which the build happens and are not portable to other processors. Portable binaries can be built using the following targets:

• make release-static-linux-x86_64 builds binaries on Linux on x86_64 portable across POSIX systems on x86_64 processors
• make release-static-linux-i686 builds binaries on Linux on x86_64 or i686 portable across POSIX systems on i686 processors
• make release-static-linux-armv8 builds binaries on Linux portable across POSIX systems on armv8 processors
• make release-static-linux-armv7 builds binaries on Linux portable across POSIX systems on armv7 processors
• make release-static-linux-armv6 builds binaries on Linux portable across POSIX systems on armv6 processors
• make release-static-win64 builds binaries on 64-bit Windows portable across 64-bit Windows systems
• make release-static-win32 builds binaries on 64-bit or 32-bit Windows portable across 32-bit Windows systems

Cross Compiling

You can also cross-compile static binaries on Linux for Windows and macOS with the depends system.

• make depends target=x86_64-linux-gnu for 64-bit linux binaries.
• make depends target=x86_64-w64-mingw32 for 64-bit windows binaries.
  • Requires: python3 g++-mingw-w64-x86-64 wine1.6 bc
• make depends target=x86_64-apple-darwin11 for macOS binaries.
  • Requires: cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev
• make depends target=i686-linux-gnu for 32-bit linux binaries.
  • Requires: g++-multilib bc
• make depends target=i686-w64-mingw32 for 32-bit windows binaries.
  • Requires: python3 g++-mingw-w64-i686
• make depends target=arm-linux-gnueabihf for armv7 binaries.
  • Requires: g++-arm-linux-gnueabihf
• make depends target=aarch64-linux-gnu for armv8 binaries.
  • Requires: g++-aarch64-linux-gnu

The required packages are the names for each toolchain on apt. Depending on your distro, they may have different names.

Using depends might also be easier to compile Nejcoin on Windows than using MSYS. Activate Windows Subsystem for Linux (WSL) with a distro (for example Ubuntu), install the apt build-essentials and follow the depends steps as depicted above.

The produced binaries still link libc dynamically. If the binary is compiled on a current distribution, it might not run on an older distribution with an older installation of libc. Passing -DBACKCOMPAT=ON to cmake will make sure that the binary will run on systems having at least libc version 2.17.

Installing Nejcoin from a package

DISCLAIMER: These packages are not part of this repository or maintained by this project's contributors, and as such, do not go through the same review process to ensure their trustworthiness and security.

Packages are available for

• Ubuntu and snap supported systems, via a community contributed build.

  snap install nejcoin --beta

Installing a snap is very quick. Snaps are secure. They are isolated with all of their dependencies. Snaps also auto update when a new version is released.

• Arch Linux (via AUR):

  • Stable release: nejcoin
  • Bleeding edge: nejcoin-git

• Void Linux:

  xbps-install -S nejcoin

• GuixSD

  guix package -i nejcoin

• Docker

  # Build using all available cores
  docker build -t nejcoin .
  
  # or build using a specific number of cores (reduce RAM requirement)
  docker build --build-arg NPROC=1 -t nejcoin .
  
  # either run in foreground
  docker run -it -v /nejcoin/chain:/root/.bitnejcoin -v /nejcoin/wallet:/wallet -p 18080:18080 nejcoin
  
  # or in background
  docker run -it -d -v /nejcoin/chain:/root/.bitnejcoin -v /nejcoin/wallet:/wallet -p 18080:18080 nejcoin

• The build needs 3 GB space.

• Wait one hour or more

Packaging for your favorite distribution would be a welcome contribution!

Running nejcoind

The build places the binary in bin/ sub-directory within the build directory from which cmake was invoked (repository root by default). To run in foreground:

./bin/nejcoind

To list all available options, run ./bin/nejcoind --help. Options can be specified either on the command line or in a configuration file passed by the --config-file argument. To specify an option in the configuration file, add a line with the syntax argumentname=value, where argumentname is the name of the argument without the leading dashes, for example log-level=1.

To run in background:

./bin/nejcoind --log-file nejcoind.log --detach

To run as a systemd service, copy nejcoind.service to /etc/systemd/system/ and nejcoind.conf to /etc/. The example service assumes that the user nejcoin exists and its home is the data directory specified in the example config.

If you're on Mac, you may need to add the --max-concurrency 1 option to nejcoin-wallet-cli, and possibly nejcoind, if you get crashes refreshing.

Internationalization

See README.i18n.md.

Using Tor

There is a new, still experimental, integration with Tor. The feature allows connecting over IPv4 and Tor simulatenously - IPv4 is used for relaying blocks and relaying transactions received by peers whereas Tor is used solely for relaying transactions received over local RPC. This provides privacy and better protection against surrounding node (sybil) attacks.

While Nejcoin isn't made to integrate with Tor, it can be used wrapped with torsocks, by setting the following configuration parameters and environment variables:

• --p2p-bind-ip 127.0.0.1 on the command line or p2p-bind-ip=127.0.0.1 in nejcoind.conf to disable listening for connections on external interfaces.
• --no-igd on the command line or no-igd=1 in nejcoind.conf to disable IGD (UPnP port forwarding negotiation), which is pointless with Tor.
• DNS_PUBLIC=tcp or DNS_PUBLIC=tcp://x.x.x.x where x.x.x.x is the IP of the desired DNS server, for DNS requests to go over TCP, so that they are routed through Tor. When IP is not specified, nejcoind uses the default list of servers defined in src/common/dns_utils.cpp.
• TORSOCKS_ALLOW_INBOUND=1 to tell torsocks to allow nejcoind to bind to interfaces to accept connections from the wallet. On some Linux systems, torsocks allows binding to localhost by default, so setting this variable is only necessary to allow binding to local LAN/VPN interfaces to allow wallets to connect from remote hosts. On other systems, it may be needed for local wallets as well.
• Do NOT pass --detach when running through torsocks with systemd, (see utils/systemd/nejcoind.service for details).
• If you use the wallet with a Tor daemon via the loopback IP (eg, 127.0.0.1:9050), then use --untrusted-daemon unless it is your own hidden service.

Example command line to start nejcoind through Tor:

DNS_PUBLIC=tcp torsocks nejcoind --p2p-bind-ip 127.0.0.1 --no-igd

Using Tor on Tails

TAILS ships with a very restrictive set of firewall rules. Therefore, you need to add a rule to allow this connection too, in addition to telling torsocks to allow inbound connections. Full example:

sudo iptables -I OUTPUT 2 -p tcp -d 127.0.0.1 -m tcp --dport 18081 -j ACCEPT
DNS_PUBLIC=tcp torsocks ./nejcoind --p2p-bind-ip 127.0.0.1 --no-igd --rpc-bind-ip 127.0.0.1 \
    --data-dir /home/amnesia/Persistent/your/directory/to/the/blockchain

Debugging

This section contains general instructions for debugging failed installs or problems encountered with Nejcoin. First, ensure you are running the latest version built from the Github repo.

Obtaining stack traces and core dumps on Unix systems

We generally use the tool gdb (GNU debugger) to provide stack trace functionality, and ulimit to provide core dumps in builds which crash or segfault.

• To use gdb in order to obtain a stack trace for a build that has stalled:

Run the build.

Once it stalls, enter the following command:

gdb /path/to/nejcoind `pidof nejcoind`

Type thread apply all bt within gdb in order to obtain the stack trace

• If however the core dumps or segfaults:

Enter ulimit -c unlimited on the command line to enable unlimited filesizes for core dumps

Enter echo core | sudo tee /proc/sys/kernel/core_pattern to stop cores from being hijacked by other tools

Run the build.

When it terminates with an output along the lines of "Segmentation fault (core dumped)", there should be a core dump file in the same directory as nejcoind. It may be named just core, or core.xxxx with numbers appended.

You can now analyse this core dump with gdb as follows:

gdb /path/to/nejcoind /path/to/dumpfile`

Print the stack trace with bt

To run nejcoin within gdb:

Type gdb /path/to/nejcoind

Pass command-line options with --args followed by the relevant arguments

Type run to run nejcoind

Analysing memory corruption

There are two tools available:

ASAN

Configure Nejcoin with the -D SANITIZE=ON cmake flag, eg:

cd build/debug && cmake -D SANITIZE=ON -D CMAKE_BUILD_TYPE=Debug ../..

You can then run the nejcoin tools normally. Performance will typically halve.

valgrind

Install valgrind and run as valgrind /path/to/nejcoind. It will be very slow.

LMDB

Instructions for debugging suspected blockchain corruption as per @HYC

There is an mdb_stat command in the LMDB source that can print statistics about the database but it's not routinely built. This can be built with the following command:

cd ~/nejcoin/external/db_drivers/liblmdb && make

The output of mdb_stat -ea <path to blockchain dir> will indicate inconsistencies in the blocks, block_heights and block_info table.

The output of mdb_dump -s blocks <path to blockchain dir> and mdb_dump -s block_info <path to blockchain dir> is useful for indicating whether blocks and block_info contain the same keys.

These records are dumped as hex data, where the first line is the key and the second line is the data.