Bitcoin was intentionally crafted with a restricted script to diminish the attack surface of the blockchain, enhancing its security and resilience. The Base layer, exemplified by bBTC, introduces programmability atop Bitcoin. Base, intricately connected to Bitcoin through its consensus mechanism known as Proof of Transfer, facilitates the utilization of Bitcoin’s security, allowing Base apps to interact with Bitcoin’s state despite operating on a distinct blockchain. With the Nakamoto release and the introduction of bBTC, a 1-1 Bitcoin-backed asset, Base propels decentralized movement of BTC in and out of Bitcoin layers.