Qtum is a cryptocurrency that combines Ethereum's smart contract capabilities with Bitcoin's unspent transaction output model (UTXO) security to produce a platform appropriate for large-scale adoption.The Account Abstraction Layer combines the UTXO account layer from Bitcoin with the Ethereum-inspired smart contract layer. It enables users to create and host programs on virtual machines.The Decentralized Governance Protocol allows smart contracts to adjust network basic characteristics like block size and gas pricing without having to hard fork the blockchain, which might save a lot of time and effort as the network grows.