According to Wu, Charles Hoskinson, the founder of Cardano, announced the launch of the first Bitcoin DeFi protocol, Cardinal, on Cardano. This protocol enables non-custodial cross-chain transactions through MuSig2 multi-signature technology, allowing users to directly use Bitcoin UTXOs to participate in lending and staking operations on the Cardano blockchain, while also being compatible with Ordinals inscriptions as collateral. The technical solution includes the BitVMX off-chain verification system and supports interaction with public chains such as Ethereum and Solana. This is the first solution that allows Bitcoin to connect to the Cardano ecosystem without the need for custody.