Storage Slot Risk Explainer

WHAT IT DOES

Storage Slot Risk Explainer is a read-only tool that analyzes storage slots in contracts for risks including collisions, overwrites, and incompatible layouts, generating AI-powered plain-language explanations of storage risks and mitigation strategies. It reads storage slot contents, storage layout, variable types, slot collisions, storage overwrite patterns, proxy storage layout, implementation storage, storage gaps, storage collision indicators, upgrade history, event logs, transaction history, contract bytecode, and privileged function signatures. The tool then presents this data alongside an AI-generated analysis of storage slot risks, identifying what storage slots are at risk, what could cause corruption, and recommending mitigation strategies — helping you understand storage safety before interacting with or relying on the contract.

HOW TO USE

Connect your wallet using the BGWallet bridge and select your target network. Enter the contract address you want to analyze. Optionally enter the implementation address for proxy contracts. Click "Analyze storage slots" to read on-chain storage data. The tool displays the contract address, implementation address, number of storage slots analyzed, collision risk level (Low/Medium/High), and storage slot risk level (Low/Medium/High). Detailed information includes layout type, storage gaps, overwrite patterns, slot collisions, proxy layout, implementation layout, upgrade history, and privileged functions. A mitigation strategy box provides specific recommendations. An AI explanation appears below the on-chain data, analyzing the contract's storage slots for risks including collisions, overwrites, and incompatible layouts, explaining what storage slots are at risk, what could cause corruption, and recommending mitigation strategies such as storage gaps, namespaced storage, or layout verification before you interact with or rely on the contract. The wallet's own signature step still protects you — this explanation is informational only and does not replace reviewing what you approve in your wallet.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 with the provider from the BGWallet bridge to read on-chain storage data. No hardcoded contract addresses are used — you are always in control of which contract you trust. When analyzing storage slot risks, the tool reads storage slot contents via provider.getStorageAt(contract, slot), reads the storage layout by analyzing the contract's bytecode and variable declarations, identifies variable types from the ABI or bytecode, detects slot collisions by comparing storage slots between proxy and implementation, detects storage overwrite patterns by analyzing write operations, reads proxy storage layout by reading proxy-specific storage slots (e.g., EIP-1967 implementation slot), reads implementation storage by reading the implementation contract's storage, detects storage gaps by analyzing unused storage slots, detects storage collision indicators by comparing slot usage, reads upgrade history by scanning event logs (e.g., Upgraded events), reads event logs by scanning for storage-related events, reads transaction history via provider.getTransactionCount(contract), reads contract bytecode via provider.getCode(contract), and reads privileged function signatures by analyzing function selectors. The tool fetches event logs by walking backwards in chunks and halving chunk size on failure, ensuring logs are properly read despite varying RPC limitations. The data is formatted and passed to the AI bridge via BGAI.generate() with a structured prompt that includes all the on-chain data read. The AI is instructed to analyze the contract's storage slots for risks including collisions, overwrites, and incompatible layouts, explain what storage slots are at risk, what could cause corruption, and recommend mitigation strategies — while stating plainly that it cannot detect storage slot risks that involve off-chain storage changes or social engineering, cannot guarantee that storage layout will remain compatible across upgrades, and cannot detect storage collisions in contracts using inline assembly or custom storage patterns. The AI response is capped at 1,024 tokens to ensure concise, focused storage slot risk assessments. All computed values are guarded against negative numbers — if a slot count or collision count appears invalid, the tool flags it rather than displaying nonsensical values.

WHAT IT CANNOT SEE

This tool cannot detect storage slot risks that involve off-chain storage changes or social engineering. It cannot guarantee that storage layout will remain compatible across upgrades. It cannot detect storage collisions in contracts using inline assembly or custom storage patterns. It cannot detect malicious intent behind storage manipulation beyond slot analysis. The AI explanation is generated from on-chain data only and cannot detect off-chain storage changes, hidden storage patterns, or social engineering attacks. It cannot predict whether a future upgrade will introduce storage collisions. The tool does not continuously monitor storage risks; each analysis is a snapshot at the time of the lookup. It cannot detect delayed storage corruption, proxy upgrades, or off-chain factors. The tool does not store any data persistently; all state is in-memory and resets on reload. The AI explanation is informational and does not constitute financial advice, legal advice, or a guarantee of storage safety or protection against storage vulnerabilities.

PLEASE NOTE

Storage Slot Risk Explainer works exclusively with EVM-compatible chains. It requires a Web3 wallet (MetaMask or similar) and the BGWallet bridge. Explanations are AI-generated from data the app reads on-chain — always review what you are actually signing in your wallet before approving it. Storage slot vulnerabilities carry significant risk including storage corruption, data loss, and loss of funds. Use this tool as a guide only; always cross-check with independent sources and contract audits for critical decisions. This is experimental software; use at your own risk.