Monero-Classic

Copyright (c) 2014-2022 The Monero-Classic Project.
Portions Copyright (c) 2012-2013 The Cryptonote developers. Portions Copyright (c) 2012-2024 The Monero developers.

Table of Contents

• Development resources
• Announcements
• Coverage
• Introduction
• About this project
• Supporting the project
• License
• Scheduled software upgrades
• Release staging schedule and protocol
• Compiling Monero from source
  • Dependencies
• Internationalization
• Using Tor
• Pruning
• Debugging
• Known issues

Development resources

• Web: Monero-classic.org
• Mail: dev@Monero-classic.org
• GitHub: https://github.com/monero-classic-lab/monero-classic-v3

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.

Coverage

Type	Status
Coverity
OSS Fuzz
Coveralls
License

Introduction

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

About this project

This is the core implementation of Monero-classic. 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-classic 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-classic'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-classic 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-classic and Bitcoin donations can be made to donate.monero-classic.org if using a client that supports the OpenAlias standard. Alternatively, you can send XMC to the Monero-classic donation address via the donate command (type help in the command-line wallet for details).

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

License

See LICENSE.

Scheduled software upgrades

Monero-Classic V3 is a new version that no longer inherits the block data of V1. V3 XMC restarts from block height 0. All V1 XMC need to be mapped to V3 XMC

Release staging schedule and protocol

Approximately one 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-Classic 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	Void pkg	Fedora pkg	Optional	Purpose
GCC	5	NO	build-essential	base-devel	base-devel	gcc	NO
CMake	3.5	NO	cmake	cmake	cmake	cmake	NO
pkg-config	any	NO	pkg-config	base-devel	base-devel	pkgconf	NO
Boost	1.58	NO	libboost-all-dev	boost	boost-devel	boost-devel	NO	C++ libraries
OpenSSL	basically any	NO	libssl-dev	openssl	libressl-devel	openssl-devel	NO	sha256 sum
libzmq	4.2.0	NO	libzmq3-dev	zeromq	zeromq-devel	zeromq-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	unbound-devel	NO	DNS resolver
libsodium	?	NO	libsodium-dev	libsodium	libsodium-devel	libsodium-devel	NO	cryptography
libunwind	any	NO	libunwind8-dev	libunwind	libunwind-devel	libunwind-devel	YES	Stack traces
liblzma	any	NO	liblzma-dev	xz	liblzma-devel	xz-devel	YES	For libunwind
libreadline	6.3.0	NO	libreadline6-dev	readline	readline-devel	readline-devel	YES	Input editing
expat	1.1	NO	libexpat1-dev	expat	expat-devel	expat-devel	YES	XML parsing
GTest	1.5	YES	libgtest-dev[1]	gtest	gtest-devel	gtest-devel	YES	Test suite
ccache	any	NO	ccache	ccache	ccache	ccache	YES	Compil. cache
Doxygen	any	NO	doxygen	doxygen	doxygen	doxygen	YES	Documentation
Graphviz	any	NO	graphviz	graphviz	graphviz	graphviz	YES	Documentation
lrelease	?	NO	qttools5-dev-tools	qt5-tools	qt5-tools	qt5-linguist	YES	Translations
libhidapi	?	NO	libhidapi-dev	hidapi	hidapi-devel	hidapi-devel	YES	Hardware wallet
libusb	?	NO	libusb-1.0-0-dev	libusb	libusb-devel	libusbx-devel	YES	Hardware wallet
libprotobuf	?	NO	libprotobuf-dev	protobuf	protobuf-devel	protobuf-devel	YES	Hardware wallet
protoc	?	NO	protobuf-compiler	protobuf	protobuf	protobuf-compiler	YES	Hardware wallet
libudev	?	NO	libudev-dev	systemd	eudev-libudev-devel	systemd-devel	YES	Hardware wallet

[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 then:

• on Debian: sudo mv libg* /usr/lib/
• on Ubuntu: sudo mv lib/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 libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libexpat1-dev libpgm-dev qttools5-dev-tools libhidapi-dev libusb-1.0-0-dev libprotobuf-dev protobuf-compiler libudev-dev 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

Install all dependencies at once on Arch:

sudo pacman -Syu --needed base-devel cmake boost openssl zeromq libpgm unbound libsodium libunwind xz readline expat gtest python3 ccache doxygen graphviz qt5-tools hidapi libusb protobuf systemd

Install all dependencies at once on Fedora:

sudo dnf install gcc gcc-c++ cmake pkgconf boost-devel openssl-devel zeromq-devel openpgm-devel unbound-devel libsodium-devel libunwind-devel xz-devel readline-devel expat-devel gtest-devel ccache doxygen graphviz qt5-linguist hidapi-devel libusbx-devel protobuf-devel protobuf-compiler systemd-devel

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 libexpat-devel libminiupnpc-devel libsodium-devel libunwind-devel unbound-devel cmake doxygen ccache fdupes gcc-c++ libevent-devel libopenssl-devel pkgconf-pkg-config readline-devel xz-devel libqt5-qttools-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 12.1 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-classic-lab/monero-classic-v3.git

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

cd monero-classic-v3 && 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 after changing branches to build successfully.

Build instructions

Monero-classic 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-classic-v3
  
  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: The instructions above will compile the most stable release of the Monero-classic 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-classic-v3//build/Linux/main/release/bin" to .profile

• Run Monero-Classic with moneroclassicd --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

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

  sudo apt install ccache

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 Monero-Classic 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 Monero-Classic and checkout the most recent release version:

  git  clone --recursive https://github.com/monero-classic-lab/monero-classic-v3.git
  cd monero-classic-v3
  

• Build:

  USE_SINGLE_BUILDDIR=1 make release

• Wait 4-6 hours

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

• Add export PATH="$PATH:$HOME/monero-classic-v3/build/Linux/main/release/bin" to $HOME/.profile

• Run source $HOME/.profile

• Run Monero-classic with moneroclassicd --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 Monero-Classic is a bit more complicated. The version of Boost available in the Debian Jessie repositories is too old to use with Monero-classic, 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 Monero-Classic except for libunwind and libboost-all-dev

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

  cd
  wget https://sourceforge.net/projects/boost/files/boost/1.72.0/boost_1_72_0.tar.bz2
  tar xvfo boost_1_72_0.tar.bz2
  cd boost_1_72_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 Monero-Classic 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.

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 mingw-w64-x86_64-unbound

  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 mingw-w64-i686-unbound

• 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/monero-classic-lab/monero-classic-v3.git 

Building

• Change to the cloned directory, run:

  cd monero-classic-v3

• If you would like a specific version/tag, do a git checkout for that version. eg. 'v0.18.2.2.3'. If you don't care about the version and just want binaries from master, skip this step:

• 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

Running moneroclassicd

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/moneroclassicd

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

To run as a systemd service, copy moneroclassicd.service to /etc/systemd/system/ and moneroclassicd.conf to /etc/. The example service assumes that the user moneroclassic 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 moneroclassic-wallet-cli, and possibly moneroclassicd, 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 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-classic 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 moneroclassicd.conf to disable listening for connections on external interfaces.
• --no-igd on the command line or no-igd=1 in moneroclassicd.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, moneroclassicd uses the default list of servers defined in src/common/dns_utils.cpp.
• TORSOCKS_ALLOW_INBOUND=1 to tell torsocks to allow moneroclassicd 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/moneroclassicd.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 moneroclassicd through Tor:

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

A helper script is in contrib/tor/monero-classic-over-tor.sh. It assumes Tor is installed already, and runs Tor and Monero-classic 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 ./moneroclassicd --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

Pruning

As of April 2022, the full Monero-classic blockchain file is about 130 GB. One can store a pruned blockchain, which is about 45 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-classic-blockchain-prune tool or using the --prune-blockchain moneroclassicd 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 Monero-classic-pedia

Debugging

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

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 moneroclassicd. 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/moneroclassicd /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-classic within gdb:

Type gdb /path/to/moneroclassicd

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

Type run to run moneroclassicd

Analysing memory corruption

There are two tools available:

ASAN

Configure Monero-classic 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-classic tools normally. Performance will typically halve.

valgrind

Install valgrind and run as valgrind /path/to/moneroclassicd. 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-classic/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.

Known Issues

Protocols

Socket-based

Because of the nature of the socket-based protocols that drive monero-classic, 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-classic node operator:

• Run moneroclassicd on a "secured" machine. If operational security is not your forte, at a very minimum, have a dedicated a computer running moneroclassicd 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 moneroclassicd with --restricted-rpc. This is a must.

Blockchain-based

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

• When receiving monero-classic, be aware that it may be locked for an arbitrary time if the sender elected to, preventing you from spending that monero-classic 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.