What Is a Wallet?

A wallet is your identity in web3. It replaces usernames, passwords, and login systems with cryptographic key pairs.

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The mental model

Think of a wallet as a keychain, not a bank account:

• Public key (address) — your identity. Like an email address, you share it freely.
• Private key — your proof of ownership. Like a password, you never share it.

The wallet doesn't "store" your tokens — they live on the blockchain. The wallet stores the private key that proves you own them.

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Types of wallets

Browser extension wallets (hot wallets)

• MetaMask (EVM), Phantom (Solana, EVM), Coinbase Wallet (EVM)
• Private key stored in the browser extension, encrypted with a password
• Convenient but vulnerable to malware, phishing, and compromised devices
• Best for: daily use, small amounts

Hardware wallets (cold wallets)

• Ledger, Trezor
• Private key stored on a physical device, never exposed to the internet
• Transactions are signed on the device — even if your computer is compromised, the key is safe
• Best for: large holdings, long-term storage

Mobile wallets

• MetaMask Mobile, Phantom Mobile, Trust Wallet
• Same as browser extensions but on your phone
• Best for: on-the-go transactions, dApp browsing

Smart contract wallets (account abstraction)

• Safe (formerly Gnosis Safe), Argent
• The wallet itself is a smart contract with custom logic
• Enables: multi-signature approval, spending limits, social recovery, gas sponsorship
• The future of wallets — more flexible, but more complex

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How wallets work with dApps

When you visit a dApp (decentralized application) and click "Connect Wallet":

1. The dApp detects available wallets via browser APIs
2. You choose which wallet to connect
3. The wallet shares your public address with the dApp
4. The dApp can now show your balances and request signatures

What the dApp CAN do:

• See your public address
• See your token balances (this is public on-chain data anyway)
• Request you to sign messages or transactions

What the dApp CANNOT do:

• Access your private key
• Move your funds without your approval
• Do anything you don't explicitly approve in the wallet popup

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EVM vs Solana wallets

Cross-chain wallets like Phantom now support both EVM and Solana, but you'll have different addresses on each.

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Seed phrases

When you create a wallet, you get a seed phrase (mnemonic) — 12 or 24 words:

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This seed phrase can regenerate your private key. If you lose your device, the seed phrase is the only way to recover your wallet.

Rules:

• Write it on paper (not digital)
• Store it somewhere safe (not in cloud storage, not in a screenshot)
• Never share it — anyone with the seed phrase has full access to your wallet
• No support team will ever ask for it — if they do, it's a scam

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Security checklist

• Seed phrase is written down physically, stored securely
• Never share private key or seed phrase with anyone
• Use a hardware wallet for large amounts
• Disconnect from dApps you don't use
• Verify URLs before connecting (bookmark trusted dApps)
• Revoke old token approvals periodically
• Use a separate "hot" wallet for risky interactions (new dApps, airdrops)