# 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

```bash
./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.