The idea behind the creation of the Qtum platform was to combine the UTXO transaction model (Unspent Transaction Outputs), known from bitcoin with the Ethereum virtual machine, allowing the creation of advanced smart contracts and decentralized applications. Thanks to this, the Qtum network is not only compatible with implementations prepared for BTC, such as SegWit or Lightning Network, but also allows you to create smart contracts with the completeness of Turing, like Ethereum. What's more, the still developing programming interface for Qtum called x86VM is to allow smart programming in the most popular languages, such as C ++, Python, Go or Rust, which is a big advantage compared to Ethereum, which allows programming only in native language Solidity. One of the goals of the Qtum team is to maintain the compatibility of smart contracts with EVM.
There are no miners in the Qtum network, and the full nodes that stack their QTUMs are responsible for creating new transaction blocks and confirming transactions. The block's time is about 120 seconds, while the prize for the block is 4 QTUM, along with transaction fees in a particular block.
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