Security · 5 min read

Crypto Wallets Explained: Custody Without Fear

By Joseph Reid, Blockchain Developer Updated January 2026

Close-up of HTML and CSS code on a dark screen

"Not your keys, not your coins" is the oldest saying in crypto — and the most misunderstood. A wallet never holds coins at all. It holds the private keys that prove you own them on the blockchain. Lose the keys, lose the access.

Hot wallets vs. cold wallets

A hot wallet lives on an internet-connected device: a phone app or browser extension. It is perfect for daily spending and fast trades. A cold wallet stays offline — a hardware device or even paper — and is where long-term holdings belong. Most people should use both.

Your seed phrase is the master key

When you create a wallet you receive 12 or 24 words. Anyone holding those words controls everything inside. That means three rules with no exceptions:

  • Write it on paper and store two copies in separate safe places.
  • Never photograph it, email it, or paste it into a website.
  • No legitimate support agent will ever ask for it. Ever.

How the Cryco app protects you

Keys are generated on your phone and never leave it. Biometric unlock guards every transaction, suspicious addresses trigger a warning before you sign, and optional encrypted cloud backup means a lost phone is an inconvenience — not a catastrophe.

Joseph Reid

Cryco's blockchain developer. He built the wallet security the article describes.