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Ethereum Applications GuildEAG Developer Course

29. BG Labs: Burner Wallets

Overview

Section titled “Overview”

A practical lesson on burner wallets — throwaway, low-stakes wallets you use for testing, experiments, and unknown dApps. It reinforces the wallet-safety habits from Module 1 with an operational rule that experienced developers live by: never mix the keys you experiment with and the keys that hold real value.

Key concepts

Section titled “Key concepts”
  • What a burner wallet is — a wallet created quickly, holding little or no real value, meant to be disposable. Scaffold-ETH and many of Austin’s tools use burner wallets so you can start transacting instantly without ceremony.
  • Why separate wallets — every time you connect a wallet to a new dApp, sign a message, or grant an approve, you take on some risk. Doing that from a burner means the worst case is losing a wallet that never held anything important.
  • The key rule: isolate real funds — keep a clear boundary between throwaway/test wallets and the wallet holding assets you care about. A leaked or compromised burner should never be able to touch your real holdings, because they’re simply different accounts.
  • Fits the course workflow — for all the labs and SpeedRun challenges you use testnet burners funded from faucets. That’s exactly the intended pattern: practice freely, risk nothing.
  • Connects to the approval risk — because burners limit blast radius, they’re the safe place to click through unfamiliar approve prompts you’d never sign from your main wallet (recall the Token Vendor allowance discussion in Module 3).

Common pitfalls

Section titled “Common pitfalls”
  • Using one wallet for everything — testing tutorials and holding real funds. One bad signature or leaked key then risks everything.
  • Assuming a burner is safe to load up “just this once.” The moment it holds real value it stops being a burner and inherits all the risk.
  • Reusing a burner’s seed phrase or key somewhere that matters. Burners are disposable by design; treat them that way.

Check yourself

Section titled “Check yourself”
  • What is a burner wallet, and what is it for?
  • Why should the wallet you test unknown dApps with never hold real assets?
  • How does using burners reduce the risk of signing an unfamiliar approve?

Watch the Video

Section titled “Watch the Video”
BG Labs: Burner Wallets

Video credit: Austin Griffith · Duration: 16 minutes

Course Position

Section titled “Course Position”

Module 4: L2, Indexing, Security & Web3 Identity.