Public Key
A cryptographic code that serves as your public address for receiving cryptocurrency. Derived from your private key, it can be safely shared with others to receive funds.
Last updated: January 5, 2025
What is a Public Key?
A public key is a cryptographic address derived from your private key that allows others to send cryptocurrency to you. Think of it like your email address—you can share it publicly so people know where to send funds, but they can’t access your account with it alone.
How Public Keys Work
The Key Pair System
- Private key: Your secret password (never share)
- Public key: Derived from private key (safe to share)
- Address: Often a shortened/hashed version of public key
Cryptographic Relationship
- Private key generates public key mathematically
- Public key cannot reverse-engineer private key
- This one-way relationship is the foundation of crypto security
Public Key vs Wallet Address
While related, they’re not identical:
| Aspect | Public Key | Wallet Address |
|---|---|---|
| Length | Long (256+ characters) | Shorter (26-42 characters) |
| Format | Raw cryptographic output | Encoded/hashed version |
| Usage | Technical operations | Receiving funds |
Most users interact with wallet addresses, which are derived from public keys.
Why Public Keys Matter
Transaction Verification
- Proves ownership without revealing private key
- Enables digital signature verification
- Secures the entire blockchain network
Safe Sharing
- Can be posted publicly without risk
- Required for receiving any cryptocurrency
- Used to verify transaction authenticity
Best Practices
- Always verify addresses when sending (double-check first and last characters)
- Use QR codes to avoid typing errors
- Generate new addresses for privacy when possible
Exchanges like Coinbase and Kraken manage public keys automatically through custodial wallets.
Ready to Start Trading?
Now that you understand public key, explore the best exchanges to begin your crypto journey.