Protocol Upgrade Compatibility Review: HashKey Exchange

HashKey Exchange, a high-throughput DEX with $1.575B TVL on Ethereum L1 and L2s, utilizes a UUPS proxy-based architecture for its core contracts, including the MatchingEngine and Settlement. Similarly, SparkLend, a multi-chain money market with approximately $5.06B TVL, employs a proxy-based upgrade system to modify interest-rate models and liquidation mechanisms. Both protocols leverage OpenZeppelin standards to evolve core logic and maintain system compatibility without disrupting user balances or operational stability across various networks.