Skip to content

README

Interactive tools to assist with blockchain analysis and research. These tools are provided free to use, and are intended to be minimalistic and easily accessible to anyone with a browser. Should they outgrow this space, they will be made available externally via Github and/or other dedicated services.

Copyright © 2026 DNZN // RESEARCH
BSD 3-Clause License - https://opensource.org/license/bsd-3-clause

Eth Wallet Analyzer

A client-side browser tool for analyzing Ethereum wallet transactions. Fetches ETH transactions (including internal transactions from contract interactions) and ERC20 token transfers from Etherscan API, then generates a detailed markdown report showing inflows, outflows, top counterparties, and recent transaction history.

Launch Tool →

Usage

  1. Get a free API key at etherscan.io/apis
  2. Enter a wallet address and your API key
  3. Set additional/optional configurations.
  4. Click "Analyze Wallet"

Privacy

  • All processing happens client-side in your browser
  • API key is stored in localStorage, and never sent to DNZN
  • Etherscan API responses are cached locally in the browser localStorage for 1 hour
  • Source available at js/tools/eth-wallet-analyzer/wallet-analyzer.js

Limitations

  • Ethereum mainnet only
  • 10,000 transaction limit per endpoint
  • ERC20 tokens only (no NFTs)

Technical Details

Endpoints

  • txlist - ETH transactions
  • txlistinternal - Internal transactions (contract calls)
  • tokentx - ERC20 transfers

Caching

  • Keyed by endpoint + parameters (API key excluded)
  • 1 hour expiry, cleaned on page load
  • Manual clear available

Gas

  • Outgoing ETH includes gas costs (gasUsed x gasPrice)

Troubleshooting

  • "Missing API key": Get one free at etherscan.io/apis
  • "Invalid address": Must start with 0x and be 42 characters
  • "No data found": No transactions in selected period, or Etherscan API down
  • Stale data: Click "Clear Cache" and re-run

Self Audit

Independent AI Review

Security analysis was performed by a separate AI context that had no prior knowledge of this tool's development.

Verdict: Safe for use.

Key findings:

  • No data exfiltration: Requests go directly to Etherscan's public API
  • Read-only operations: All Etherscan API calls are read-only queries (no transactions signed, no write operations)
  • API key protection: Stored in localStorage, stripped from cache keys, never logged
  • Input validation: Addresses validated against ^0x[a-fA-F0-9]{40}$
  • Cache expiry: Entries expire after 1 hour, cleaned on page load

Additional notes:

  • Markdown rendering uses marked.js with internally-generated content (not user input)
  • Wallet history stored locally (max 10 addresses), user-clearable
  • API key show/hide/delete controls with confirmation prompts