According to CoinDesk, Anduro, a multi-chain second-layer network incubated by Bitcoin miner Marathon Digital Holdings, has introduced the decentralized exchange (DEX) network Portal to Bitcoin, aiming to enhance the practicality of the world's earliest blockchain network. Anduro uses a process called merged mining, where participating miners can receive Bitcoin-denominated income from transactions on these chains while continuing to mine Bitcoin on the base layer. In addition, Anduro may provide miners with further sources of income. Portal uses Bitcoin's second-layer network Lightning to allow users to convert assets such as ETH to BTC through atomic swaps. This practice is common on Ethereum-based assets and other blockchains, but it is a more recent development on Bitcoin.