What is Public Key?

A public key is the openly shareable half of a cryptographic key pair. It is mathematically linked to your private key but cannot be used to derive it. Your wallet address is generated from your public key, and the network uses the public key to verify that a signature really came from the matching private key.

This matters because it is the mechanism that lets the blockchain confirm you authorised a transaction without ever exposing your secret. It is the trust math underneath every payment.

Example: when you sign a transaction with your private key, validators use your public key to check the signature is valid, proving ownership without you revealing anything sensitive.

Safety note: a public key is safe to share, unlike the private key it is paired with. The whole security model depends on keeping the private key and seed phrase secret while the public key and address can be public. Do not let confusing terminology trick you; if anyone asks for a “key” to receive funds, they only ever need your public address, never your private key. Related terms include private key, wallet address, message signing, and EOA.