Crypto
2 min read

Wallet

Software or hardware that stores cryptographic keys and lets users send, receive, and interact with crypto assets. Wallets do not actually hold tokens — they hold the keys that control them on-chain.

What a wallet actually is

The technical reality:

  • Wallet stores keys, not coins.
  • Private key — secret that authorizes spending.
  • Public key / address — receives funds.
  • Coins exist on the blockchain, not in the wallet.
  • Wallet is the interface for managing keys and signing transactions.

Lose the keys, lose access. The wallet itself is replaceable; the keys aren't.

Wallet types

Major categories:

Each makes different trade-offs.

Custody spectrum

Several models:

  • Self-custody — you control keys; full responsibility.
  • Custodial — exchange or service holds keys; convenience and counterparty risk.
  • Smart contract wallets — programmable custody (account abstraction).
  • MPC wallets — distributed key management.

The convenience-vs-control trade-off has many points along the spectrum.

Common wallet mistakes

Frequent errors:

  • Sharing seed phrase — never share with anyone.
  • Photographing seed phrase — defeats the security model.
  • Single backup location — losing the only backup is permanent loss.
  • Wrong network — sending tokens to wrong chain often loses them.
  • Approving malicious contracts — phishing attacks.

Wallet hygiene is critical to crypto safety.

Choosing a wallet

Considerations:

  • Use case — daily spending, long-term holding, DeFi interaction.
  • Chain support — does it support what you use?
  • Track record — established wallets have fewer surprises.
  • UX — varies dramatically.
  • Hardware integration — for higher security.

Many users have multiple wallets for different purposes.

Backup and recovery

Critical practice:

  • Seed phrase — write down, store securely.
  • Multiple copies in geographically separated locations.
  • Metal backups for fire/water resistance.
  • Test recovery before relying on backup.
  • Never digital — no photos, no cloud storage of seed.

Most lost crypto is due to backup failures.

Wallet security

Several practices:

  • Hardware wallet for significant holdings.
  • Separate wallets by purpose (savings, daily, DeFi).
  • Verify addresses before sending.
  • Review contract approvals periodically.
  • Be skeptical of all unsolicited contact about your wallet.

Security is a continuous practice, not one-time setup.

What individuals should know

For all crypto users:

  • Seed phrase is everything — protect accordingly.
  • Self-custody requires real responsibility.
  • Hardware wallets for any meaningful amount.
  • Approve cautiously — most hacks involve user-signed malicious approvals.

Wallets are the foundation of crypto interaction. Understanding the security model and practicing good hygiene is essential to avoiding the most-common ways people lose funds.