Public key
Definition
A public key is derived from a private key and can be shared safely; it lets others verify your signatures and send you funds.
Public-key cryptography uses a mathematically linked pair of numbers. The private key is kept secret and used to sign; the public key is derived from it and can be published. Anyone can use the public key to check that a signature genuinely came from the matching private key, without learning that key. On most blockchains your address is a shortened, hashed form of the public key.
Why it matters
This one-way relationship is what makes self-custody possible. You can hand out an address to receive funds, list it publicly, or post it on a website, and none of that endangers your holdings. The link runs in only one direction: it is practical to compute a public key from a private key, but not the reverse.
Common misunderstanding
Some people treat the public key or address as something that must be kept secret. It does not. Sharing an address is like sharing an email address for receiving mail; it reveals your on-chain history to anyone who looks, but it cannot be used to spend. The genuine risk is confusing the two: never expose the private key while trying to share the public one. Note also that a public key and an address are related but not identical, and that block explorers usually display the address rather than the raw public key. In practice, then, treat the address as public information and reserve all your caution for the private key it is derived from.
Related terms
Note: CamoCrypt is security & education only — no prices, no predictions, no investment advice. Verify every address and contract yourself; we cannot recover lost funds and neither can anyone who contacts you claiming they can.