Protocol Upgrade Compatibility Review: SparkLend

Target Protocol : SparkLend (TVL: $5057.3M)

SparkLend

Protocol Upgrade Compatibility Review

TVL: ≈ $5.06 B (Ethereum + L2)

Date: 23 Oct 2026

Prepared by: [Your Name], Senior DeFi Security Researcher & Smart‑Contract Auditor

1. Executive Summary

SparkLend is a high‑value, multi‑chain money market that leverages a proxy‑based upgrade architecture to evolve its core logic (interest‑rate models, collateral factors, liquidation mechanisms, etc.) without disrupting user balances. The protocol’s current upgrade pathway consists of:

Component Pattern Upgrade Authority Storage Layout

Core Lending Engine Transparent/Universal Upgradeable Proxy (UUPS) Spark Governance (Timelock + Multisig) Fixed‑slot mapping (reserve data, user balances)

Interest Rate Model Separate implementation contract called via delegatecall Same as Core Uses same storage slot layout as Core (via struct ReserveData )

L2 Bridge Adapter Minimal proxy (EIP‑1967) L2 Bridge DAO Independent…