PANews reported on November 21 that the Sign team released the sovereign Layer 2 architecture "SIGN Stack," built on BNB Chain and opBNB, specifically designed for national deployment of digital infrastructure and compliant stablecoins. This solution features customized sequencer permissions, a DID identity system, gas-free stablecoin transfers, and the ability to put national physical assets (RWA) onto the blockchain, aiming to establish BNB Chain as the settlement layer for global sovereign blockchain infrastructure.