Bug Bounty Scope Definition Generator

WHAT IT DOES

Bug Bounty Scope Definition Generator is a read-only security tool that analyzes EVM smart contract bytecode and generates structured scope definitions for bug bounty programs. It maps all public and external functions, categorizes them by risk level (critical, medium, low, view), identifies external dependencies and contract calls, detects proxy patterns, and provides recommended bounty ranges based on the contract's attack surface. The tool outputs a comprehensive scope document including in-scope functions, out-of-scope items, recommended testing methodologies, and critical function lists to help security teams, project owners, and bounty platform administrators quickly establish clear, defensible bug bounty scopes without manual code review.

HOW TO USE

Connect your EVM-compatible wallet via the BGWallet bridge and select the network where your contract is deployed. Enter the contract address you want to define a scope for, optionally provide a project name, and click "Generate Scope Definition". The tool fetches the bytecode, extracts all function signatures, classifies each function by risk based on naming patterns and categories (critical: financial/state-changing functions like transfer, withdraw, swap; medium: admin/configuration functions like set, update, pause; low: view/read-only functions), detects external dependencies, and produces a structured scope definition. Results include function categorization, recommended bounty ranges, out-of-scope items, testing recommendations, and risk-level breakdowns. All analysis is read-only—no signatures or transactions are submitted.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to fetch contract bytecode via provider.getCode(address), then performs multi-stage static analysis. Function extraction scans for the 0x63 PUSH4 opcode pattern to identify function selectors (4-byte signatures), deduplicates them, and processes each signature through a classification engine. Risk classification uses pattern matching against known function naming conventions—critical patterns include transfer, withdraw, swap, mint, burn, deposit, addLiquidity, removeLiquidity, execute, call, stake, unstake, approve; medium patterns include set, update, change, config, add, remove, enable, disable, pause, unpause; low/view patterns include get, is, has, balance, allowance, view, pure. Each function is assigned a risk score and category (high-value, admin, view, helper). External dependency detection scans bytecode for external call opcodes (0x73 CALL) followed by 40-byte address patterns to identify called contracts. The tool also calculates contract complexity metrics based on function count and opcode patterns to recommend appropriate bounty ranges (higher complexity and more critical functions yield higher recommended bounties). The scope definition is structured as a document with categorized function lists, dependency tracking, out-of-scope items (external dependencies, frontend bugs, social engineering, DoS), and testing recommendations. The tool is deterministic—given the same bytecode, it produces consistent scope definitions, enabling repeatable bounty program setup.

WHAT IT CANNOT SEE

This tool has fundamental limitations that users must understand. It cannot generate a complete bug bounty scope without manual review of business logic and intended functionality—function names alone do not capture the full security implications of a contract's behavior. It cannot determine which functions are truly "critical" for security without understanding application context—a function named "set" may be critical in one protocol and harmless in another. It cannot automatically differentiate between harmless helper functions and high-value attack surfaces—some view functions can expose sensitive information that aids attackers. It cannot verify that all external dependencies and off-chain components are captured in the scope—the tool only detects on-chain calls and misses off-chain oracles, admin wallets, governance contracts, or frontend dependencies. It cannot detect access control implementations—a critical function may be protected by onlyOwner or requireRole modifiers, which the tool cannot determine from bytecode alone. It cannot assess the quality of the source code or identify logic flaws that require human reasoning. The tool's risk classification is heuristic and may misclassify functions, especially those with unconventional naming. It does not perform formal verification, semantic analysis, or business logic understanding. The generated scope is a starting point, not a final document.

PLEASE NOTE

This tool only supports EVM-compatible blockchains (Ethereum, Polygon, BSC, Avalanche C-Chain, Optimism, Arbitrum, and their testnets). Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. The tool is free, open-source, requires no API keys, and uses the wallet's native provider for all read operations. Always review and customize generated scope definitions to match your specific project context and threat model.