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Analyzing Market
Glossary

Public Key

A public key is a cryptographic value derived from a private key. It can be shared freely and is used to receive funds and to let others verify that a transaction was genuinely signed by the matching private key.

How it works

Public-key cryptography uses a pair of keys. The private key signs; the public key verifies. A wallet address is typically a shortened, encoded form of the public key. When you receive crypto, the sender is sending it to an address derived from your public key; when you spend, the network checks your signature against that public key to confirm you are authorised.

Why it matters

This one-way relationship is what makes blockchains trustless: you can prove ownership and authorise transfers without ever revealing the secret that controls your funds. Sharing a public key or address is safe; sharing a private key is not.

Example

The address you paste into an exchange’s “withdraw” field is generated from your wallet’s public key.

Public Key: Frequently Asked Questions

What is the difference between a public key and a private key?
They are a matched pair. The private key is secret and signs transactions; the public key is derived from it, can be shared freely, and is used to verify those signatures. A wallet address is usually a shortened, encoded form of the public key. Sharing a public key or address is safe, but the private key must stay secret.
Is it safe to share my public key or address?
Yes. A public key, and the address derived from it, is meant to be shared so others can send you funds and verify your signatures. The one-way relationship with the private key means revealing the public key does not expose the secret that controls your funds. Only the private key must be kept confidential.
How is a public key used when I receive crypto?
When someone sends you crypto, they send it to an address derived from your public key. When you later spend those funds, the network checks your signature against the public key to confirm you are authorized, without ever seeing your private key. This lets you prove ownership and receive funds while keeping the controlling secret hidden.
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