When someone asks for your crypto so they can pay you, you hand over a wallet address — a string of letters and numbers. Behind that address sits a public key, and behind that, a private key you never reveal. People often blur the address and the public key together, but they are different links in one chain. Here is what each is, how they are derived from one another, and which one is safe to share.
Start with the private key
Everything begins with the private key: a secret number that must never be shared. Through one-way math, the private key produces a public key. The process only runs in that direction — you can compute the public key from the private key, but you cannot work backward from the public key to the private one. That one-way relationship is what makes the whole system safe to use in the open.
The public key
The public key is derived directly from the private key and is used by the network to verify that a transaction was really signed by the matching private key — without the private key ever being exposed. In some cases the public key becomes visible on the blockchain when you spend funds. It is longer and less convenient to pass around than the short address most people actually use.
The wallet address
The wallet address is a shortened, encoded version of the public key, produced by running it through additional hashing and formatting. This is the compact string you copy, share, or turn into a QR code so others can send you crypto. Because it is derived from the public key, which came from the private key, all three are mathematically linked — but only the address is meant for everyday sharing.
Which is safe to share
The address, and by extension the public key, are safe to give out: they let people send you funds and verify your transactions, but neither can be used to spend your coins. Only the private key can do that, which is why it must stay secret. Sharing your address is like giving someone your account number to receive a payment — useful and harmless, as long as the private key behind it stays yours alone.
The bottom line
A private key generates a public key, and the public key is compressed and encoded into a wallet address. The address is the short, shareable form you give out to receive funds; the public key is the longer value the network uses to verify signatures. Both are safe to share because neither can spend your crypto — that power belongs only to the private key you keep hidden. To keep learning the fundamentals, follow more from Bitbase Academy.
Disclaimer: This article is educational content from Bitbase Academy, provided for information only. It does not constitute investment, trading, tax, or financial advice. Crypto assets are volatile; assess your own risk. Written as of June 2026; refer to the latest official information.
References
[1] Investopedia, "Private Key: What It Is, How It Works, Best Ways to Store" investopedia.com
[2] Investopedia, "Cryptocurrency Explained With Pros and Cons for Investment" investopedia.com
[3] Bitcoin BIPs, "BIP-32: Hierarchical Deterministic Wallets" github.com
