A Community-Oriented Bitcoin Layer2 BRC20 Trading Platform with Fairness, Shared Benefits, Transparency, and Low Gas Fees SATSAT is an order book trading system for BRC20 tokens that is built on the Bitcoin second-layer network, MAP Protocol. It functions similarly to the existing Bitcoin Layer 1 order book trading systems but distinguishes itself by being constructed on the Bitcoin second-layer network MAP Protocol, offering a transaction system with significantly lower gas fees. Additionally, the transaction fee revenues are allocated to the community members.