Internet reports that Cardano founder Charles Hoskinson launched Cardinal, the first Bitcoin DeFi protocol, on Cardano. The protocol enables unmanaged cross-chain through MuSig2 multi-signature technology, allowing users to directly use Bitcoin UTXO to participate in lending and pledge operations on the Cardano chain, and is also compatible with Ordinals inscriptions as collateral. The technical solution includes BitVMX off-chain verification system and supports interaction with public chains such as Ethereum and Solana.