Qtum wallet

Secure your (QTUM) assets

Secure your Qtum assets with the most trusted hardware wallet. Cold storage wallets are typically encrypted devices that store users' Qtum assets offline, providing a layer of security against the evolving threats emerging from being connected to the Internet.




Discover our wallets How to manage Qtum with Ledger devices

Secure your Qtum (QTUM)

Secure multiple assets, including Qtum, using a Ledger Hardware Wallet.
Your private keys, giving access to your assets, remain safe in a certified secure chip.

Ledger Nano S

Ledger Nano S

Protect your Qtum assets with the first and only
independently-certified Qtum wallet on the market.

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Ledger Nano X

Ledger Nano X

The Ledger Nano X is a Bluetooth® enabled secure and
CES award winning device that protect your Qtum assets.

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How to manage your Qtum (QTUM)

Ledger Live

Directly manage your Qtum with Ledger Live, our own desktop and mobile application. Check your balance in real-time, send and receive your Qtum and 1000+ other assets directly from Ledger Live.

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What is Qtum (QTUM)

QTUM is a smart contracts cryptocurrency platform built on Bitcoin’s UTXO transaction model that layers a virtual machine on top of it to enable Turing-complete smart contracts. In fact, QTUM enables two virtual machines -- Ethereum’s EVM and QTUM’s native x86 VM.


Qtum (QTUM) features

QTUM raised $15 million in its 2017 ICO, and its ecosystem’s development is overseen by the QTUM Foundation, which is based in Singapore.

QTUM deploys a proof-of-stake (PoS) consensus mechanism to help the network scale on-chain and also has a unique decentralized governance protocol (DGP). The recently unveiled QTUM x86 VM prototype is the most significant development for the platform since its launch, enabling developers to program decentralized applications (dapps) in the C language.

Account Abstraction Layer, Governance, and the x86 Virtual Machine

What separates QTUM from other smart contracts platform is its reliance on a UTXO transaction scheme while enabling Turing-complete smart contracts functionality. Other smart contracts platforms (i.e., Ethereum) rely on an account-based model due to the sophisticated problems that arise from combining UTXO and Turing-complete applications.

QTUM achieves both using its proprietary account abstraction layer (AAL), a layer in the system stack between the UTXO set and virtual machine (EVM or x86) that allows for developers to build applications and contracts as if it were an account-based model. The AAL is very complex, and also is the critical factor that affords QTUM the ability to add new virtual machines -- such as x86.

The consensus of the QTUM network is validated using an optimized PoS protocol, derived from Blackcoin. Technically, QTUM can scale to between 70 and 100 transactions per second, but the network is focusing on layer two solutions for scaling.

The DGP is QTUM’s independent governance protocol that allows developers to control consensus parameters like block sizes on a limited basis. However, they are not intended for major network upgrades nor do they eliminate the need for hard or soft forks.

The landmark development of QTUM since its launch has been the x86 VM, which the team provides extensive documentation on. Along with the EVM, x86 is the virtual machine of QTUM, which is basically the smart contracts engine that executes programs on the network and can operate across different platforms such as Macs, PCs, cloud servers, etc.

Currently, x86 supports the C programming language but is scheduled to integrate support for Python, C++, Rust, and other languages on the QTUM roadmap. The x86 VM is currently in the prototype stage and is scheduled for mainnet integration at the end of 2019.

Future Developments and Monetary Policy

Besides the primary QTUM platform, the QTUM team has also developed an independent, enterprise-focused blockchain network called Unita -- previously known as QtumX. Unita is a private/permissioned network that substitutes proof-of-authority consensus for the PoS consensus of the core protocol for the QTUM blockchain.

In recent news, QTUM unveiled that users can deploy full nodes on Google’s Cloud Platform, which presents a copy of the QTUM blockchain and developer environment for users to host on Google’s cloud service for a few dollars. The platform also has some interesting developments on its horizon, including a public testnet of the Lightning Network and on-chain scaling improvements.

Coming out of the ICO, there was a total fixed supply of 100 million QTUM, of which, 51 million were sold to the public and the remaining 49 million was allocated to the founders, early adopters, and the development team. The maximum supply is just over 107 million now, and there are just under 96 million QTUM in circulation.

Originally a hybrid of Bitcoin and Ethereum, QTUM has evolved into a unique smart contracts platform with two virtual machines.

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