[HashKey Releases HSK White Paper 2.0: Defining 'On-Chain Financial Infrastructure'] This white paper systematically presents the capability upgrade path of HashKey Chain in the direction of on-chain financial infrastructure, focusing on institutional-grade permissioned chains, a one-stop asset tokenization and circulation system for RWA, as well as on-chain identity and payment capabilities tailored for the AI agent economy. It further explores the structural trend of global financial activities shifting from 'off-chain' to 'on-chain'.