Designed to operate on top of the Bitcoin blockchain, layer-2s are emerging rapidly, fueled by years of innovation in the Ethereum ecosystem. Now, they promise to bring decentralized finance (DeFi) solutions to the original blockchain. Despite locking millions in value onchain in a few months, Bitcoin layer-2s are still in their infancy. As with any early-stage development, there are still challenges to overcome, including security issues and user experience concerns. At the Bitcoin 2024 conference in Nashville, Tennessee, the Cointelegraph team sat down with protocols that have recently onboa…