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my-homelab-configs/labs/blockchain/WALLET_LAB.md

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Wallet And Signing Lab

This lab is for disposable development wallets only.

Do not use:

  • real seed phrases
  • hardware wallet recovery words
  • funded private keys
  • exchange account keys

Commands

./jeannie blockchain-wallet instructions
./jeannie blockchain-wallet new
export PRIVATE_KEY=0x...
./jeannie blockchain-wallet address
./jeannie blockchain-wallet sign-message "homelab devnet login"

What To Learn

  • A private key controls an address.
  • A signature proves control of a private key without revealing it.
  • A transaction signature authorizes state change on a specific chain.
  • Chain IDs matter because they prevent replay across networks.
  • Seed phrases and private keys are secrets, not configuration.

Safe Practice Flow

  1. Start the devnet with ./jeannie blockchain-devnet up.
  2. Use one of Anvil's printed dev private keys or generate a disposable key.
  3. Derive the address.
  4. Sign a harmless message.
  5. Verify the address and signature with Foundry/Cast experiments.
  6. Throw away the key when done.