About Qtum and Mainnet Ignition
Qtum is a decentralized blockchain project built on Bitcoin's UTXO model, with support for Ethereum Virtual Machine based smart contracts, and secured by a proof of stake consensus model. It achieves this through the revolutionary Account Abstraction Layer which allows the EVM to communicate with Qtum's Bitcoin-like UTXO blockchain. For more general information about Qtum as well as links to join our community, go to https://qtum.org
Welcome to the Qtum Ignition Main Network. This is the main network where the tokens hold value and should be guarded very carefully. There will be a testnet setup soon for developers, in the meantime you can use
-regtest mode for testing needs. We will announce details about the token swap from QTUM ERC20 coins to QTUM mainnet tokens soon, watch our website for details about that.
The major features implemented in Qtum Ignition include:
- The Ethereum Virtual Machine, which allows for compatibility with most existing Solidity based smart contracts.
- The Smart Staking Protocol is complete, which is an optimized Proof of Stake implementation designed for a smart contract platform (however, smart contracts can not participate in staking yet).
- An early and basic smart contract GUI has been implemented that can be used for creating contracts, sending data and Qtum to them, and checking their status by executing them locally. This functionality is similar to Mist's UI right now, but it is still an early version. We will be working on this more to improve it.
- Regtest mode, which is ideal for developers who wish to create their own private blockchain. It is tuned specifically to make development easier. It will stake blocks automatically every 30 seconds, and can generate proof-of-work blocks instantly as needed.
- The Decentralized Governance Protocol is completely implemented and functional, which allows certain network parameters to be modified without a fork.
For more technical information for how to start developing with Qtum please read the Guide and also see this tutorial for deploying a simple faucet smart contract (it hasn't yet been updated for Mainnet for obvious reasons, but all the instructions are the same and you can try them in regtest mode)
Note: Qtum Core is considered beta software. We make no warranties or guarantees of its security or stability.
- v0.16.0 - Upgrade Qtum core to bitcoin core 0.16 and bug fixes
- Upgrade Qtum core to bitcoin core 0.16 including segwit wallet, bech32 addresses, HD-wallets by default and more
- Fix a bug where contract transactions with no change would fail in some cases
- Fix a display bug where multiple logs would not show corretly in Qt wallet
- Update gitian build scripts to support ubuntu bionic as building host
- v0.15.3 - Recommended update - Bug fix
- Fix a bug with
waitforlogsrpc calls that caused duplicacte logs to show in some cases
- Add support for building with boost 1.67
- Fix a bug with
- v0.15.2 - Recommended update - Improved seeding and bug fixes
- Fix a staker halving subsidy calculation bug
- Fix some translations errors and typos
- Add Support for openssl 1.1
- Fix CVE-2018-12356 by hardening the regex
- Fix a python tests bug that caused bulk running of tests to fail
- Add static seeds
- Add new dns seed nodes
- Update copyright year
- v0.15.1 - Upgrade Qtum core to bitcoin core 0.15.1 and bug fixes
- Upgrade Qtum core code to bitcoin core 0.15.1 with important performance improvments and other features, read more about bitcoin core 0.15.0 and 0.15.1
- Fix a bug with reindexing when the data directory is empty
- Prevent sending QRC20 tokens to P2SH Qtum addresses in the Qt wallet
- Restore JS number as string support for
- Fix a bug where the wrong block hash would be stored in the transaction receipt for miners with
- v0.14.16 - Improvments and Bug fixes
- Fixed a bug where transactions with low fees would get stuck in the local mempool.
- Fix a bug with clearing cache of StorageResults
- Add contract support to "createrawtransaction" rpc call
- Add sender support to "sendtoaddress" rpc call
- v0.14.15 - Recommended Update
- Add EVM global variables to callcontract
- Update gitian build script
- Update CentOS build instructions
- Add exception data to TransactionReceipt
- Fixed a bug where the gas price could not be parsed correctly on certain platforms (reported by APIS)
- Fixed a bug where the logs were not reverted on disconnect block in certain cases
- v0.14.14 - Mandatory Update
- New Qt GUI
- Fix Qt wallet freeze when syncing from scratch with
- Fix a bug with cacheUTXO (hardfork at block 100000 in mainnet, 84500 in testnet)
- Add update checking functionality to Qt wallet
- Fix a bug in token transfers history dates
- Fix a bug with searchlogs rpc call
- Add an extra check when adding token addresses
- Fix compatibility with boost 1.66
- Add checkpoints
- Update nMinimumChainWork and defaultAssumeValid chain params
- Add minmempoolgaslimit startup argument
- Add Gitian build signatures
- v0.14.13 - Mandatory Update
- Fix a callcontract bug which in very specific cases could cause the node to fail to sync the blockchain
- Add ability to save and restore contract addresses and ABI data
- Make the token confirmation view data correct
- v0.14.12 - Recommended Update
- Added option to disable change address usage
- Fixed bug where heavy RPC usage could cause the wallet to crash
- v0.14.11 - Optional Update
- Changed our versioning scheme to be consistent and avoid the two version number confusion
- Add feature to restore wallet in the Qt wallet
- Add new RPC call "waitforlogs" that is particularly useful for Dapp developers
- Add long-polling support to the gettransaction RPC call
- v1.1.4 - Recommended update
- Fixed a bug that would cause syncing to stop
- Fixed a bug that would cause the wallet to crash when using -logevents
- v1.1.3 - Highly recommended update
- Fixed a bug that caused contact addresses to show in receive token address dropdown
- v1.1.2 - Optional update, but recommended if using QRC tokens
- Fixed a bug with token transactions where the transaction ID displayed was incorrect in the Qt wallet
- Allow adding 0 balance addresses as the token receiver in the Qt wallet
- v1.1.1: When sending to contracts, the sender address is now the default change address to reduce confusion; fix -salvagewallet so it works with token transactions
- v1.1.0: Add GUI support Qtum QRC tokens, allowing full management of tokens on the Qtum blockchain from the Qt wallet
- Sending to a contract no longer requires ABI data, allowing easy participation in simple crowdsale contracts
- v1.0.4: Fix bug where certain circumstances when staking could cause the displayed balance to be inaccurate until completely redownloading the blockchain.
- v1.0.3: Fix staker bug that reported false messages; slightly increases staking performance; optimize staker parameters; fix white send button in GUI
- v1.0.2: Various UI fixes, minor gas overflow consensus fix, per-txout exploit fix, testnet mode setup and functioning
- v1.0.1: Fixed network magic bytes and minimum version to ensure the main network does not conflict with the Skynet network
- v1.0: Initial release
Reindex Required When Upgrading from v1.0.1
When you first start the Qtum 1.0.2 GUI wallet after using Qtum v1.0.1 it will prompt you that it must reindex the database. This is normal and is a result of switching our internal database format from per-transaction to per-txout. If you use
qtumd -daemon it will silently fail to start. You need to use
qtumd -daemon -reindex in this case.
Qtum Documentation and Usage Resources
Basic usage resources:
- Official Qtum Usage Guide
- Unofficial Qtum staking tutorial
- Unofficial Qtum staking tutorial on Raspberry Pi
- Unofficial guide for keeping your wallet safe
- Block explorer
- Unofficial block explorer
- Unofficial Raspberry Pi Web UI
General Info about Qtum:
- Mainnet event AMA
- Qtum's PoS vs CASPER
- Technical article explaining Qtum's PoS model in depth
- Unofficial What is Qtum article
Build Qtum Core
If you want to build it from source, it's recommended to follow the specific "build" documentation for your platform. But mostly it boils down to the following:
Clone the qtum source code and cd into
git clone --recursive https://github.com/qtumproject/qtum.git cd qtum
Configure and build the headless qtum binaries as well as the GUI (if Qt is found).
You can disable the GUI build by passing
./autogen.sh ./configure make
It is recommended to build and run the unit tests to ensure everything is working correctly:
If you encounter an error like:
make: *** No rule to make target ‘cpp-ethereum/utils/libscrypt/b64.c’, needed by ‘cpp-ethereum/utils/libscrypt/libbitcoinconsensus_la-b64.lo’. Stop.
Then you did not checkout the cpp-ethereum submodule for Qtum. To do that, simply:
cd qtum git submodule update --init --recursive
Validate and Reproduce Binaries
Qtum uses a tool called Gitian to make reproducible builds that can be verified by anyone. Instructions on setting up a Gitian VM and building Qtum are provided in doc/gitian-building.md
Make sure to check out these resources as well for more information and to keep up to date with all the latest news about Qtum. At least 1 developer is always around, so if you're developing on Qtum and need help, we'd love to welcome you to our community.
Qtum Smart Contract Limitations
- EVM smart contracts can not receive coins from or send coins to any address type other than pay-to-pubkeyhash (starts with Q) addresses. This is due to a limitation in the EVM
- Contracts are not allowed to create contracts with an initial endowment of coins. The contract must first be created, and then be sent coins in a separate transaction. Humans are also not allowed to create contracts with an initial endowment of coins.
- Although all of the infrastructure is present, Qtum Core does not currently parse Solidity event data. You must parse this yourself using either
- It is not possible to send a contract coins without also executing the contract. This is also the case of Ethereum. This was promised in earlier discussions and technically does work, but due to lack of time for testing this feature was disabled. We hope to reenable this feature with release of the x86 virtual machine in 2018.
- In Qtum there can be multiple addresses used to create a proof-of-stake block. However, the EVM can only see the first output using the
coinbaseoperation in Solidity (this address is also the one registered for the continuous staker rewards after 500 blocks).
If you would like to validate that the binaries you download are exactly the same as those provided and built by the Qtum team, then you can compare your binaries to the following sha256sum hashes: c2ec20b370673e8aacdb3bde09b5cce8e3badc0e6cb72de586b685aee8ebe259 qtum-0.16.0-aarch64-linux-gnu-debug.tar.gz 872e302af7c8aa951ba0691c203bdc73337d856a3980379b79f14ab28586d14a qtum-0.16.0-aarch64-linux-gnu.tar.gz 5ff954f3adc27a37f868b2e3562a8101a524f403b6078d656b7bc4d17b62a1e7 qtum-0.16.0-arm-linux-gnueabihf-debug.tar.gz 36dce83f1cc029986232f745107707f1036bc30ef894c67cb0f24ed702997cbb qtum-0.16.0-arm-linux-gnueabihf.tar.gz 45e1cc279a629155ab14674e1a3e5e5d52eebedef3049ad2a1c41d3c324e2e13 qtum-0.16.0-i686-pc-linux-gnu-debug.tar.gz 457ebfb7c47ea2bdd6c39a40f026c44a86acf893a8e0264b892224675c488c69 qtum-0.16.0-i686-pc-linux-gnu.tar.gz b64c61687dc2e110912c0ff436d4603e37cfadbb16b4f2829e3e3d7829451adc qtum-0.16.0-x86_64-linux-gnu-debug.tar.gz 74d1ba262228da6c67c66a300b5958005b1a1a24b1cb2842adcde43e18a17d14 qtum-0.16.0-x86_64-linux-gnu.tar.gz 7f44ee6a79a926a132436b78651f0f88bd027e58fe3a61abf4fb64a64bf619a5 src/qtum-0.16.0.tar.gz 6ad3d74e4182edca44953b525fcca7d77f9f453a9d20c378b2c137bdcf48ed03 qtum-linux-0.16-res.yml a611f292a3a8b998f2026d2a50ee5f38392c54d79c261d1fdc36b05ae3a0ccad qtum-0.16.0-win-unsigned.tar.gz 101ff28c3185609f80e720b7a459c62350dcdc0836b8374faf2018bc132574ed qtum-0.16.0-win32-debug.zip 5aec9e0167bda6d0cacdbf06767df0664fa79ea5d032f8723f25c23e4c393d76 qtum-0.16.0-win32-setup-unsigned.exe 05be6987402b23cd3f30f9953e3d364651e3ab283b9c165e2499819a13a3c63d qtum-0.16.0-win32.zip 61a9e06a59334f51f8c2313feed4f42d25c0297fa6d998c02f2645947c08fe64 qtum-0.16.0-win64-debug.zip 02f71f3f2397a446476c0df624c28dda9b70272d5db34a954edbe1072ee37d4e qtum-0.16.0-win64-setup-unsigned.exe bc750094105b772ff4545043147fd91938d7eea2ee3b914dee6f7e94753ee3e3 qtum-0.16.0-win64.zip 7d9c89e3dfc2de474268cf324beae1dc7a66bab92057d26e9aeaf846d29ddddf src/qtum-0.16.0.tar.gz 094cb15c4b580adb6444e95b7ec55bebb099b2f4778636d3c131db9703813914 qtum-win-0.16-res.yml ce359262f11e7bdd76aad78e6ad84be3f5ebadae2ad02c81695b0435579fc2a6 qtum-0.16.0-osx-unsigned.dmg cc9ff41c9751e70dd5891bc6f7452d3509e8e957442d156569387f9ed523159a qtum-0.16.0-osx-unsigned.tar.gz f5f3be285f96dccdc5425eea8326cff75cc5b0023760c615f8bb016b9b68ef70 qtum-0.16.0-osx64.tar.gz 7d9c89e3dfc2de474268cf324beae1dc7a66bab92057d26e9aeaf846d29ddddf src/qtum-0.16.0.tar.gz e9c982ba306f2af702bb985afeb54bce8282ef24cce12dca381074ca02706194 qtum-osx-0.16-res.yml