!! Important Announcement !!
This repository is no longer maintained since Bitcreds has been rebranded as Alterdot as of version v1.8.0. The new repository can be found here.
master 
Copyright (c) 2017-2021 Bitcreds Developers
Note for this version: v1.7.3 represents the first part of a transition process that will result in upgrading our codebase to newer standards from Dash, this version by itself will be rejected by the network by block 1,040,000 (or earlier) so it is necessary to upgrade right away when the next version gets released. After block 1,034,000 all Bitcreds nodes running this version will switch to lite mode, disabling Masternodes, InstantSend, PrivateSend and allowing only the basic operations inherited from Bitcoin.
- Coin Suffix: BCRS
- PoW Mining Algorithm: Argon2d250 until January 30, 2021 6:00:00 PM UTC; Argon2d16000 afterwards
- PoW Difficulty Algorithm: DELTA
- PoW Target Spacing: 128 Seconds until block 1,000,000; 360 Seconds afterwards
- PoW Reward per Block: See Below
- Maturity: 10 Blocks
- PoW Blocks: ~675 per day until block 1,000,000; ~240 per day afterwards
- Masternode Collateral Amount: 10,000 BCRS
- Masternode Min Confirmation: 16 Blocks
- Masternode Reward: See Below
- Total Coins (until 2 PoW / 2 MN / 2 DevFund reward): ~13,914,700* (after ~5 Years from Genesis)
- Min TX Fee: 0.0001 BCRS
*Some blocks did not pay full rewards therefore the actual total supply is lower.
Bitcreds uses peer-to-peer technology to operate securely with no central authority (decentralisation): managing transactions and issuing currency (BCRS) are carried out collectively by the Bitcreds network. Bitcreds is the name of open source software which enables the use of the currency BCRS.
Bitcreds utilises Masternodes, Privatesend and InstantSend to provide anonymous and near instant transaction confirmations.
Bitcreds implements Gavin Andresens signature cache optimisation from Bitcoin for significantly faster transaction validation.
Masternode/Privatesend Network Information Utilisation of InstantSend for near-instant transactions and PrivateSend for anonymous transactions.
MainNet Parameters P2P Port = 31000 RPC Port = 31050 Masternodes = 31000 Magic Bytes: 0x2f 0x32 0x45 0x51
TestNet Parameters P2P Port = 31400 RPC Port = 31450 Masternodes = 31400 Magic Bytes: 0x1f 0x22 0x05 0x30
RegTest Parameters P2P Port = 31500 RPC Port = 31550 Masternodes = 31500 Magic Bytes = 0x1f 0x22 0x05 0x2f
Rewards Structure
| Year | Blocks | PoW | Masternodes | Development Fund | Total Generated |
|---|---|---|---|---|---|
| 2017 | 0 - 375,000 | 10 BCRS | 1 BCRS | 0 BCRS | 11 BCRS |
| 2018 | 375,001 - 500,000 | 8 BCRS | 2 BCRS | 0.5 BCRS | 10.5 BCRS |
| 2018 | 500,001 - 550,000 | 7 BCRS | 3 BCRS | 0.5 BCRS | 10.5 BCRS |
| 2019 | 550,001 - 625,000 | 7 BCRS | 3 BCRS | 1 BCRS | 11 BCRS |
| 2019 | 625,001 - 750,000 | 6 BCRS | 4 BCRS | 0.5 BCRS | 10.5 BCRS |
| 2019 | 750,001 - 875,000 | 5 BCRS | 5 BCRS | 0.5 BCRS | 10.5 BCRS |
| 2020 | 875,001 - 1,000,000 | 4 BCRS | 6 BCRS | 0.5 BCRS | 10.5 BCRS |
| 2021 | 1,000,001 - 1,043,800 | 6 BCRS | 6 BCRS | 2 BCRS | 14 BCRS |
| 2021 | 1,043,801 - 1,087,600 | 5 BCRS | 5 BCRS | 2 BCRS | 12 BCRS |
| 2022 | 1,087,601 - 1,131,400 | 4 BCRS | 4 BCRS | 2 BCRS | 10 BCRS |
| 2022 | 1,131,401 - 1,175,200 | 3 BCRS | 3 BCRS | 2 BCRS | 8 BCRS |
| 2023 | 1,175,201 - ∞ | 2 BCRS | 2 BCRS | 2 BCRS | 6 BCRS |
Some notes on how to build Bitcreds in Unix.
Always use absolute paths to configure and compile Bitcreds and the dependencies, for example, when specifying the the path of the dependency:
../dist/configure --enable-cxx --disable-shared --with-pic --prefix=$BDB_PREFIX
Here BDB_PREFIX must absolute path - it is defined using $(pwd) which ensures the usage of the absolute path.
./autogen.sh
./configure
make
make install # optionalThis will build bitcreds-qt as well if the dependencies are met.
These dependencies are required:
| Library | Purpose | Description |
|---|---|---|
| libssl | SSL Support | Secure communications |
| libboost | Boost | C++ Library |
| libevent | Networking | OS independent asynchronous networking |
Optional dependencies:
| Library | Purpose | Description |
|---|---|---|
| miniupnpc | UPnP Support | Firewall-jumping support |
| libdb4.8 | Berkeley DB | Wallet storage (only needed when wallet enabled) |
| qt | GUI | GUI toolkit (only needed when GUI enabled) |
| protobuf | Payments in GUI | Data interchange format used for payment protocol (only needed when GUI enabled) |
| libqrencode | QR codes in GUI | Optional for generating QR codes (only needed when GUI enabled) |
| libzmq3 | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.x) |
For the versions used in the release, see release-process.md under Fetch and build inputs.
C++ compilers are memory-hungry. It is recommended to have at least 3 GB of memory available when compiling Bitcreds.
Build requirements:
sudo apt-get install build-essential libtool automake autotools-dev autoconf pkg-config libssl-dev libcrypto++-dev libevent-dev git
for Ubuntu 12.04 and later or Debian 7 and later libboost-all-dev has to be installed:
sudo apt-get install libboost-all-dev
db4.8 packages are available here. You can add the repository using the following command:
sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update
Ubuntu 12.04 and later have packages for libdb5.1-dev and libdb5.1++-dev, but using these will break binary wallet compatibility, and is not recommended.
for Debian 7 (Wheezy) and later: The oldstable repository contains db4.8 packages. Add the following line to /etc/apt/sources.list, replacing [mirror] with any official debian mirror.
deb http://[mirror]/debian/ oldstable main
To enable the change run
sudo apt-get update
for other Debian & Ubuntu (with ppa):
sudo apt-get install libdb4.8-dev libdb4.8++-dev
Optional (see --with-miniupnpc and --enable-upnp-default):
sudo apt-get install libminiupnpc-dev
ZMQ dependencies (provides ZMQ API 4.x):
sudo apt-get install libzmq3-dev
If you want to build Bitcred-Qt, make sure that the required packages for Qt development
are installed. Qt 5 is necessary to build the GUI.
If both Qt 4 and Qt 5 are installed, Qt 5 will be used. Pass --with-gui=qt5 to configure to choose Qt5.
To build without GUI pass --without-gui.
For Qt 5 you need the following:
sudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler libcrypto++-dev libdb++-dev
libqrencode (optional) can be installed with:
sudo apt-get install libqrencode-dev
Once these are installed, they will be found by configure and a bitcreds-qt executable will be built by default.
The release is built with GCC and then "strip bitcredsd" to strip the debug symbols, which reduces the executable size by about 90%.
miniupnpc may be used for UPnP port mapping. It can be downloaded from here. UPnP support is compiled in and turned off by default. See the configure options for upnp behavior desired:
--without-miniupnpc No UPnP support miniupnp not required
--disable-upnp-default (the default) UPnP support turned off by default at runtime
--enable-upnp-default UPnP support turned on by default at runtime
To build:
tar -xzvf miniupnpc-1.6.tar.gz
cd miniupnpc-1.6
make
sudo su
make install
It is recommended to use Berkeley DB 4.8. If you have to build it yourself:
BITCREDS_ROOT=$(pwd)
# Pick some path to install BDB to, here we create a directory within the Bitcreds directory
BDB_PREFIX="${BITCREDS_ROOT}/db4"
mkdir -p $BDB_PREFIX
# Fetch the source and verify that it is not tampered with
wget 'http://download.oracle.com/berkeley-db/db-4.8.30.NC.tar.gz'
echo '12edc0df75bf9abd7f82f821795bcee50f42cb2e5f76a6a281b85732798364ef db-4.8.30.NC.tar.gz' | sha256sum -c
# -> db-4.8.30.NC.tar.gz: OK
tar -xzvf db-4.8.30.NC.tar.gz
# Build the library and install to our prefix
cd db-4.8.30.NC/build_unix/
# Note: Do a static build so that it can be embedded into the exectuable, instead of having to find a .so at runtime
../dist/configure --prefix=/usr/local --enable-cxx
make
sudo make install
# Configure Bitcreds to use our own-built instance of BDB
cd $BITBCRS_ROOT
./configure (other args...) LDFLAGS="-L${BDB_PREFIX}/lib/" CPPFLAGS="-I${BDB_PREFIX}/include/"Note: You only need Berkeley DB if the wallet is enabled (see the section Disable-Wallet mode below).
If you need to build Boost yourself:
sudo su
./bootstrap.sh
./bjam install
To help make your Bitcreds installation more secure by making certain attacks impossible to exploit even if a vulnerability is found, binaries are hardened by default. This can be disabled with:
Hardening Flags:
./configure --enable-hardening
./configure --disable-hardening
Hardening enables the following features:
-
Position Independent Executable Build position independent code to take advantage of Address Space Layout Randomization offered by some kernels. An attacker who is able to cause execution of code at an arbitrary memory location is thwarted if he doesn't know where anything useful is located. The stack and heap are randomly located by default but this allows the code section to be randomly located as well.
On an Amd64 processor where a library was not compiled with -fPIC, this will cause an error such as: "relocation R_X86_64_32 against `......' can not be used when making a shared object;"
To test that you have built PIE executable, install scanelf, part of paxutils, and use:
scanelf -e ./bitcredsdThe output should contain: TYPE ET_DYN
-
Non-executable Stack If the stack is executable then trivial stack based buffer overflow exploits are possible if vulnerable buffers are found. By default, bitcreds should be built with a non-executable stack but if one of the libraries it uses asks for an executable stack or someone makes a mistake and uses a compiler extension which requires an executable stack, it will silently build an executable without the non-executable stack protection.
To verify that the stack is non-executable after compiling use:
scanelf -e ./bitcredsdthe output should contain: STK/REL/PTL RW- R-- RW-
The STK RW- means that the stack is readable and writeable but not executable.
When the intention is to run only a P2P node without a wallet, Bitcreds may be compiled in disable-wallet mode with:
./configure --disable-wallet
In this case there is no dependency on Berkeley DB 4.8.
Mining is also possible in disable-wallet mode, but only using the getblocktemplate RPC call.
For increased performance when mining, AVX2 optimisations can be enabled.
This can be done either prior to running the build commands by setting:
CPPFLAGS=-march=native
or at configure time:
--enable-avx2
CPUs with AVX2 support:
Intel
Haswell processor, Q2 2013
Haswell E processor, Q3 2014
Broadwell processor, Q4 2014
Broadwell E processor, Q3 2016
Skylake processor, Q3 2015
Kaby Lake processor, Q3 2016(ULV mobile)/Q1 2017(desktop/mobile)
Coffee Lake processors, 2017
Cannon Lake processors, 2018
Ice Lake processors, 2019
Comet Lake processors, 2019
AMD
Carrizo processors, Q2 2015
Ryzen processors, Q1 2017
For increased performance when mining, AVX512F optimisations can be enabled.
At configure time:
--enable-avx512f
CPUs with AVX512F support:
Intel
Xeon Phi x200/Knights Landing processors, 2016
Knights Mill processors, 2017
Skylake-SP processors, 2017
Skylake-X processors, 2017
Cannon Lake processors, 2018
Cascade Lake processors, 2019
Ice Lake processor, 2019
Cooper Lake processors, 2020
Tiger Lake processor, 2020
Whether or not your CPU has AVX2 and AVX512F support is, in general, easily available information on the Web so we recommend looking it up yourself as not all compatibile processors are shown in the lists above. These two Wikipedia articles https://en.wikipedia.org/wiki/Advanced_Vector_Extensions and https://en.wikipedia.org/wiki/AVX-512 offer quite a bit of information in this sense.
Qt Wallet and Deamon, CLI version build:
./autogen.sh && ./configure --with-gui && make
CLI and Deamon Only Buld:
./autogen.sh && ./configure --without-gui && make