The Gateway to Bitcoin DeFi. @build_on_bob (Build on Bitcoin) is a hybrid L2 that is closest to the goal of "using DeFi with Bitcoin" by intertwining Bitcoin security with the Ethereum ecosystem. The starting point of the project is simple. Over $1 trillion in Bitcoin capital is almost immobilized and locked (with a DeFi participation rate of about 0.3%), while Ethereum and L2 are rich in liquidity and applications. BOB technically connects the two worlds by layering data availability using Ethereum blobs on top of an EVM execution environment based on the OP Stack, along with finality/economic guarantees through Bitcoin and Babylon. As a result, users can bring native BTC with a single wallet and use Ethereum-style DeFi while minimizing wrapping and custody dependencies. The key differentiator is the bridge. BOB adopts a trust-minimized model using BitVM2, designed to prevent fraudulent withdrawals with just "one honest challenger," unlike traditional multi-sig and custody bridges. In the peg-out process, it combines ZK-SNARK proofs with a 7-day challenge window for hybrid verification, securing both pre-proof (fast UX) and post-challenge (strong oversight). The execution layer also features a hybrid structure that combines optimistic fraud proofs and ZK verification, allowing conservative users to choose ample finality while practical users can opt for shorter confirmation times. Additionally, through a gateway with LayerZero, it connects wBTC.OFT liquidity and provides one-click movement to 11 chains with "Bitcoin intent," simplifying the UX. In terms of governance and security, BOB is still at Stage 0 according to L2Beat standards. Centralization points remain, such as sequencer and upgrade authority, and validator control, and since the BitVM bridge aims for a mainnet launch in Q4 2025, operational risks may follow in the early stages. Therefore, BOB's trust is completed through transparency. Upgrade time locks, forced inclusion SLAs, authority reduction timelines, bug bounties, and external audit scopes should be disclosed quarterly, and actual challenge and dispute resolution cases should be recorded as data. Conversely, the opportunities are clear. As BTC LST expands through Babylon integration, the flywheel of "BTC deposit → yield generation → re-deposit" will turn, and the gateway and SDK will accelerate developer onboarding. The EVM compatibility and Superchain network effects that make it easy to move Ethereum dApps will favorably increase the pathways for "incoming BTC to be used immediately." The content strategy must be as clear as the technical structure. The external message is simple: "Your BTC, your yield," but the narrative filling it is composed of three layers. First, it compares why BitVM is safe against multi-sig and threshold signatures, numerically and procedurally, and unpacks all steps of peg-in/out in diagrams. Second, it presents user pathways through real-time cost comparisons, showing the process of moving anywhere on 11 chains for staking, LP, and vaults via the gateway's one-click feature with tutorials, screenshots, and fee receipts. Third, it enhances yield visibility by providing a dashboard that aligns bank interest, bond coupons, and DeFi APY on the same scale, and publicly shares backtest results for LST, LP, and vault combinations, including fees and slippage as actual figures. Alongside this, regularly updating a comparison table that honestly contrasts "BOB vs Stacks/Rootstock/Merlin" and "wBTC/tBTC/BitVM bridge" including functionality, trust assumptions, and recovery procedures will quickly build trust among users facing decisions. In conclusion, BOB agilely bridges the conservatism of Bitcoin and the innovation of Ethereum. Technically, it combines trust minimization based on BitVM with a hybrid rollup, while commercially, it emphasizes the experience of "BTC directly linked to yield" to persuade capital inflow. The immediate tasks are threefold: to successfully establish the BitVM mainnet, to gradually resolve Stage 0 centralization elements according to the roadmap, and to create tighter pathways for incoming BTC to be used immediately (gateway → LST/vault/DeFi). If these tasks are consistently proven with transparent data and practical guides, BOB is likely to establish itself as a key gateway to convert "99% of Bitcoin's dormant capital" into DeFi productivity.