Qtum (pronounced "quantum") is a blockchain platform that combines a modified Bitcoin Core infrastructure with a compatible version of the Ethereum Virtual Machine (EVM). Launched in 2017 following a successful token sale, Qtum was designed to bridge the reliability of Bitcoin's UTXO transaction model with the smart contract capabilities of Ethereum, targeting enterprise and business-oriented use cases.

The project introduced an Account Abstraction Layer (AAL) that allows Ethereum-compatible smart contracts to run on top of Bitcoin's UTXO model. This hybrid architecture enables Qtum to support Solidity smart contracts while maintaining compatibility with Bitcoin's Simple Payment Verification (SPV) protocol, making it possible to execute smart contracts from lightweight mobile wallets. Qtum uses a Proof-of-Stake consensus mechanism rather than Proof-of-Work.

Qtum's mainnet has been operational since 2017 and has undergone several upgrades to improve performance and compatibility. The platform supports decentralized applications, token issuance, and smart contract execution while maintaining backward compatibility with both Ethereum contracts and Bitcoin gateways. The Qtum Foundation, based in Singapore, oversees ongoing development and ecosystem growth. The project represents one of the notable efforts to combine the strengths of the two largest blockchain ecosystems into a single platform.

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