Zeus Network has introduced BitcoinKit, a new developer toolkit aimed at integrating Bitcoin into Solana's decentralized finance (DeFi) ecosystem. Released in Epoch 10, BitcoinKit provides libraries, CLI tools, and APIs to facilitate the integration of Bitcoin by decentralized exchanges (DEXs), wallets, and cross-chain protocols. This initiative builds on existing Zeus products such as APOLLO, btcSOL, and LightningFi, and seeks to establish a 'Bitcoin economy on Solana.' The toolkit enables users to lock Bitcoin for zBTC within the DeFi space while ensuring asset security on the native Bitcoin blockchain. The cross-chain model, which depends on nodes and guardians, is currently pending real-world testing to validate its functionality and security.