The Citrea network has launched its Bitcoin Layer 2 mainnet, utilizing zero-knowledge proof technology to expand Bitcoin's financial ecosystem. This development allows sophisticated financial applications to operate directly on-chain, enabling capital management and settlement within the Bitcoin network. Citrea's architecture processes transactions off-chain, increasing throughput while maintaining Bitcoin's security. Citrea's mainnet introduces the ctUSD stablecoin, a dollar-pegged asset facilitating DeFi activities without Bitcoin's price volatility. This launch positions Citrea as a significant player in the Bitcoin Layer 2 landscape, offering a platform for smart contracts and decentralized finance applications. The success of Citrea's mainnet could redefine Bitcoin's role beyond a store of value, unlocking new financial opportunities.