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An Open-Sourced Blockchain Application Platform.
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Qtum (QTUM) is a blockchain aiming for "socio-technical application suitability, the adoption of formal semantics language expressiveness, and the provision of smart-contract template libraries for rapid best-practice industry deployment".
Its blockchain combines a UTXO model with a Proof-of-Stake (PoS) consensus mechanism, thanks to the use of a Account Abstraction Layer. In addition, Qtum allows for multiple virtual machines, such as the Ethereum Virtual Machine (EVM) and the x86 VM, and supports several programming languages including C, C++, Rust, and Python.
The QTUM token is required to fuel transaction on Qtum and thus acts as some kind of "gas".
Qtum also has a decentralized governance protocol (DGP) to directly modify a predefined list of parameters such as the block-size and gas costs.