Monero

Copyright (c) 2014-2026, The Monero Project
Portions Copyright (c) 2012-2013 The Cryptonote developers.

Table of Contents

• Development resources
• Vulnerability response
• Research
• Announcements
• Introduction
• About this project
• Supporting the project
• License
• Contributing
• Scheduled software/network upgrades
• Release staging schedule and protocol
• Compiling Monero from source
• Dependencies
• Guix builds
• Installing Monero from a package
• Running monerod
• Using Tor
• Pruning
• Debugging
• Known issues

Development resources

• Web: getmonero.org
• Mail: dev@getmonero.org
• GitHub: https://github.com/monero-project/monero
• IRC: #monero-dev on Libera
• It is HIGHLY recommended that you join the #monero-dev IRC channel if you are developing software that uses Monero. Due to the nature of this open source software project, joining this channel and idling is the best way to stay updated on best practices and new developments in the Monero ecosystem. All you need to do is join the IRC channel and idle to stay updated with the latest in Monero development. If you do not, you risk wasting resources on developing integrations that are not compatible with the Monero network. The Monero core team and community continuously make efforts to communicate updates, developments, and documentation via other platforms – but for the best information, you need to talk to other Monero developers, and they are on IRC. #monero-dev is about Monero development, not getting help about using Monero, or help about development of other software, including yours, unless it also pertains to Monero code itself. For these cases, checkout #monero.

Vulnerability response

• Our Vulnerability Response Process encourages responsible disclosure
• We are also available via HackerOne
• Monero is continuously fuzzed by OSS-Fuzz

Research

The Monero Research Lab is an open forum where the community coordinates research into Monero 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 Monero research. You are encouraged to get in touch with the Monero research community if you have questions, wish to collaborate, or would like guidance to help avoid unnecessarily duplicating earlier or known work.

The Monero research community is available on IRC in #monero-research-lab on Libera, which is also accessible via Matrix.

Announcements

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

Introduction

Monero 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: Monero 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 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 should be encrypted with a strong passphrase to ensure they are useless if ever stolen.

Untraceability: By taking advantage of ring signatures, a special property of a certain type of cryptography, Monero 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 Monero depends on its decentralised peer-to-peer consensus network - anyone should be able to run the monero software, validate the integrity of the blockchain, and participate in all aspects of the monero network using consumer-grade commodity hardware. Decentralization of the monero network is maintained by software development that minimizes the costs of running the monero software and inhibits the proliferation of specialized, non-commodity hardware.

About this project

This is the core implementation of Monero. 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 Monero 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 Monero'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

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

The Monero donation address is:
888tNkZrPN6JsEgekjMnABU4TBzc2Dt29EPAvkRxbANsAnjyPbb3iQ1YBRk1UXcdRsiKc9dhwMVgN5S9cQUiyoogDavup3H
Viewkey:
f359631075708155cc3d92a32b75a7d02a5dcf27756707b47a2b31b21c389501
Base address for restoring with address and viewkey:
44AFFq5kSiGBoZ4NMDwYtN18obc8AemS33DBLWs3H7otXft3XjrpDtQGv7SqSsaBYBb98uNbr2VBBEt7f2wfn3RVGQBEP3A

The Bitcoin donation address is:
1KTexdemPdxSBcG55heUuTjDRYqbC5ZL8H

Core development funding and/or some supporting services are also graciously provided by sponsors:

<img height="26" hspace="6" src="https://www.getmonero.org/img/sponsors/tarilabs.png" />
<img height="30" hspace="6" src="https://www.getmonero.org/img/sponsors/macstadium.png" />
<img height="26" hspace="6" src="https://www.getmonero.org/img/sponsors/cakewallet.png" />
<img height="30" hspace="6" src="https://www.getmonero.org/img/sponsors/symas.png" />
<img height="30" hspace="6" src="https://www.getmonero.org/img/sponsors/cypherstack.png" />

License

See LICENSE.

Contributing

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

Scheduled software/network upgrades

Monero uses a scheduled software/network upgrade (hard fork) mechanism to implement new features into the Monero software and network. This means that users of Monero (end users and service providers) should run current versions and upgrade their software when new releases are available. Software upgrades occur when new features are developed and implemented in the codebase. Network upgrades occur in tandem with software upgrades that modify the consensus rules of the Monero network. The required software for network upgrades will be available prior to the scheduled network upgrade date. Please check the repository prior to this date for the proper Monero software version. Below is the historical schedule and the projected schedule for the next upgrade.

Dates are provided in the format YYYY-MM-DD. The "Minimum" is the software version that follows the new consensus rules. The "Recommended" version may include bug fixes and other new features that do not affect the consensus rules.

| 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
| 1978433 | 2019-11-30 | v12 | v0.15.0.0 | v0.16.0.0 | New PoW based on RandomX, only allow >= 2 outputs, change to the block median used to calculate penalty, v1 coinbases are forbidden, rct sigs in coinbase forbidden, 10 block lock time for incoming outputs
| 2210000 | 2020-10-17 | v13 | v0.17.0.0 | v0.17.3.2 | New CLSAG transaction format
| 2210720 | 2020-10-18 | v14 | v0.17.1.1 | v0.17.3.2 | forbid old MLSAG transaction format
| 2688888 | 2022-08-13 | v15 | v0.18.0.0 | v0.18.5.1 | ringsize = 16, bulletproofs+, view tags, adjusted dynamic block weight algorithm
| 2689608 | 2022-08-14 | v16 | v0.18.0.0 | v0.18.5.1 | forbid old v14 transaction format

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 Monero 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).

Install all dependencies at once on Debian/Ubuntu:

sudo apt update && sudo apt install build-essential cmake pkg-config libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind-dev libreadline-dev libhidapi-dev libusb-1.0-0-dev libprotobuf-dev protobuf-compiler libboost-chrono-dev libboost-date-time-dev libboost-filesystem-dev libboost-locale-dev libboost-program-options-dev libboost-regex-dev libboost-serialization-dev libboost-system-dev libboost-thread-dev python3 ccache doxygen graphviz git curl

Install all dependencies at once on Arch:

sudo pacman -Syu --needed base-devel cmake boost boost-libs openssl zeromq unbound libsodium libunwind readline python ccache doxygen graphviz hidapi libusb protobuf

Install all dependencies at once on Fedora:

sudo dnf install gcc gcc-c++ cmake pkgconf boost-devel openssl-devel zeromq-devel unbound-devel libsodium-devel libunwind-devel readline-devel ccache doxygen graphviz hidapi-devel libusb1-devel protobuf-devel protobuf-compiler

Install all dependencies at once on openSUSE:

sudo zypper ref && sudo zypper in cppzmq-devel libboost_chrono-devel libboost_date_time-devel libboost_filesystem-devel libboost_locale-devel libboost_program_options-devel libboost_regex-devel libboost_serialization-devel libboost_system-devel libboost_thread-devel libsodium-devel libunwind-devel unbound-devel cmake doxygen ccache fdupes gcc-c++ libevent-devel libopenssl-devel pkgconf-pkg-config readline-devel patterns-devel-C-C++-devel_C_C++

Install all dependencies at once on macOS with the provided Brewfile:

brew update && brew bundle --file=contrib/brew/Brewfile

FreeBSD one-liner required to build dependencies:

pkg install git gmake cmake pkgconf boost-libs libzmq4 libsodium unbound

Cloning the repository

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

git clone --recursive https://github.com/monero-project/monero

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

cd monero && git submodule init && git submodule update

Note: If there are submodule differences between branches, you may need to use git submodule sync && git submodule update --init after changing branches to build successfully.

Build instructions

Monero 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 monero
    git checkout release-v0.18
    make

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

Note: The instructions above will compile the most stable release of the Monero 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/monero/build/release/bin" to .profile

• Run Monero with monerod --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: build documentation in doc/html (omit HAVE_DOT=YES if graphviz is not installed):

    HAVE_DOT=YES doxygen Doxyfile

• Optional: use ccache not to rebuild translation units, that haven't really changed. Monero's CMakeLists.txt file automatically handles it

    sudo apt install ccache

On the Raspberry Pi

Tested on a Raspberry Pi 5B with a clean installation of Raspberry Pi OS (64-bit) with Debian 12 from https://www.raspberrypi.com/software/operating-systems/.

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

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

• Optional: 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 "usb_max_current_enable=1" to /boot/firmware/config.txt

• Clone Monero and checkout the most recent release version:

    git clone --recursive https://github.com/monero-project/monero.git
    cd monero
    git checkout v0.18.5.1

• Build:

    USE_SINGLE_BUILDDIR=1 make release

• Wait a few hours

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

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

• Run source $HOME/.profile

• Run Monero with monerod --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

On Windows:

Binaries for Windows can be 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.

Preparing the build environment

• Download and install the MSYS2 installer. Installing MSYS2 requires 64-bit Windows 10 or newer.
• Open the MSYS shell via the MSYS2 MSYS shortcut
• Update packages using pacman:

    pacman -Syu

• Install dependencies:

    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 mingw-w64-x86_64-unbound

• Open the MingW shell via MSYS2 MINGW64 shortcut.

Cloning

• To git clone, run:

    git clone --recursive https://github.com/monero-project/monero.git

Building

• Change to the cloned directory, run:

    cd monero

• If you would like a specific version/tag, do a git checkout for that version. eg. 'v0.18.5.1'. If you don't care about the version and just want binaries from master, skip this step:

    git checkout v0.18.5.1

• To build Monero, run:

    make release-static -j $(nproc)

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

• Optional: to build Windows binaries suitable for debugging, run:

    make debug -j $(nproc)

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 Monero in a jail, you need to add sysvsem="new" to your jail configuration, otherwise lmdb will throw the error message: Failed to open lmdb environment: Function not implemented.

Monero is also available as a port or package as monero-cli.

On OpenBSD:

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

The doxygen and graphviz packages are optional and require the xbase set. Running the test suite also requires py3-requests package.

Build monero: gmake

Note: you may encounter the following error when compiling the latest version of Monero 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 NetBSD:

Check that the dependencies are present: pkg_info -c libexecinfo boost-headers boost-libs protobuf readline libusb1 zeromq git-base pkgconf gmake cmake | more, and install any that are reported missing, using pkg_add or from your pkgsrc tree. Readline is optional but worth having.

Third-party dependencies are usually under /usr/pkg/, but if you have a custom setup, adjust the "/usr/pkg" (below) accordingly.

Clone the monero repository recursively and checkout the most recent release as described above. Then build monero: gmake BOOST_ROOT=/usr/pkg LDFLAGS="-Wl,-R/usr/pkg/lib" release. The resulting executables can be found in build/NetBSD/[Release version]/Release/bin/.

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.

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: g++-mingw-w64-x86-64
• You also need to run:

    update-alternatives --set x86_64-w64-mingw32-g++ $(which x86_64-w64-mingw32-g++-posix) && 
    update-alternatives --set x86_64-w64-mingw32-gcc $(which x86_64-w64-mingw32-gcc-posix)

• make depends target=x86_64-apple-darwin for Intel macOS binaries.
• Requires: clang-19 lld-19
• make depends target=arm64-apple-darwin for Apple Silicon macOS binaries.
• Requires: clang-19 lld-19
• You also need to run:

    export PATH="/usr/lib/llvm-19/bin/:$PATH"

• 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
• make depends target=riscv64-linux-gnu for RISC V 64 bit binaries.
• Requires: g++-riscv64-linux-gnu
• make depends target=x86_64-unknown-freebsd for freebsd binaries.
• Requires: clang
• make depends target=arm-linux-android for 32bit android binaries
• make depends target=aarch64-linux-android for 64bit android binaries

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 Monero 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.

Trezor hardware wallet support

If you have an issue with building Monero with Trezor support, you can disable it by setting USE_DEVICE_TREZOR=OFF

USE_DEVICE_TREZOR=OFF make release

For more information, please check out Trezor src/device_trezor/README.md.

Guix builds

See contrib/guix/README.md.

Building and running monerod with Docker

# Build image
docker build -t monerod .

# Create a directory on the host for the blockchain
mkdir -p /path/to/bitmonero

# Run it
docker run -d --user $(id -u):$(id -g) -v /path/to/bitmonero:/.bitmonero -p 127.0.0.1:18080:18080 -p 127.0.0.1:18081:18081 monerod

Installing Monero 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

• Debian 12 (Bookworm) or later

    sudo apt install monero

• Arch Linux:

    sudo pacman -S monero

• NixOS:

    nix-shell -p monero-cli

• Guix:

    guix package -i monero

• Alpine Linux:

    apk add monero

• macOS (homebrew)

    brew install monero

Packaging for your favorite distribution would be a welcome contribution!

Running monerod

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 the foreground:

./bin/monerod

To list all available options, run ./bin/monerod --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/monerod --log-file monerod.log --detach

To run as a systemd service, copy monerod.service to /etc/systemd/system/ and monerod.conf to /etc/. The example service assumes that the user monero 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 monero-wallet-cli, and possibly monerod, if you get crashes refreshing.

Using Tor

> There is a new, still experimental, integration with Tor. The feature allows connecting over IPv4 and Tor simultaneously - 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 Monero 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 monerod.conf to disable listening for connections on external interfaces.
• 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 monerod through Tor:

monerod --proxy 127.0.0.1:9050 --p2p-bind-ip 127.0.0.1

A helper script is in contrib/tor/monero-over-tor.sh. It assumes Tor is installed already, and runs Tor and Monero with the right configuration.

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 ./monerod --p2p-bind-ip 127.0.0.1 --rpc-bind-ip 127.0.0.1 
    --data-dir /home/amnesia/Persistent/your/directory/to/the/blockchain

Pruning

As of June 2026, the full Monero blockchain file is about 280 GB. One can store a pruned blockchain, which is about 95 GB. A pruned blockchain can only serve part of the historical chain data to other peers, but is otherwise identical in functionality to the full blockchain. To use a pruned blockchain, it is best to start the initial sync with --prune-blockchain. However, it is also possible to prune an existing blockchain using the monero-blockchain-prune tool or using the --prune-blockchain monerod option with an existing chain. If an existing chain exists, pruning will temporarily require disk space to store both the full and pruned blockchains.

For more detailed information see the 'Pruning' entry in the Moneropedia

Debugging

This section contains general instructions for debugging failed installs or problems encountered with Monero. 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/monerod `pidof monerod`

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 monerod. 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/monerod /path/to/dumpfile

Print the stack trace with bt

• If a program crashed and cores are managed by systemd, the following can also get a stack trace for that crash:

coredumpctl -1 gdb

To run Monero within gdb:

Type gdb /path/to/monerod

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

Type run to run monerod

Analysing memory corruption

There are two tools available:

ASAN

Configure Monero 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 monero tools normally. Performance will typically halve.

valgrind

Install valgrind and run as valgrind /path/to/monerod. 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 ~/monero/external/db_drivers/liblmdb && make

The output of mdb_stat -ea will indicate inconsistencies in the blocks, block_heights and block_info table.

The output of mdb_dump -s blocks and mdb_dump -s block_info 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.

Known Issues

Protocols

Socket-based

Because of the nature of the socket-based protocols that drive monero, certain protocol weaknesses are somewhat unavoidable at this time. While these weaknesses can theoretically be fully mitigated, the effort required (the means) may not justify the ends. As such, please consider taking the following precautions if you are a monero node operator:

• Run monerod on a "secured" machine. If operational security is not your forte, at a very minimum, have a dedicated computer running monerod and do not browse the web, use email clients, or use any other potentially harmful apps on your monerod machine. Do not click links or load URL/MUA content on the same machine. Doing so may potentially exploit weaknesses in commands which accept "localhost" and "127.0.0.1".
• If you plan on hosting a public "remote" node, start monerod with --restricted-rpc. This is a must.

Blockchain-based

Certain blockchain "features" can be considered "bugs" if misused. Consequently, please consider the following:

• When receiving monero, be aware that it may be locked for an arbitrary time if the sender elected to, preventing you from spending that monero until the lock time expires. You may want to hold off acting upon such a transaction until the unlock time lapses. To get a sense of that time, you can consider the remaining blocktime until unlock as seen in the show_transfers command.