A cryptocurrency wallet is your personal bank in the world of digital assets. But unlike a traditional bank, here you and only you are solely responsible for the safety of your funds. The foundation of this security lies in two concepts: the public and private key. Understanding their role is the first and most important step towards securely storing your cryptocurrency.
An Analogy That Explains Everything: The Mailbox
To understand the difference, imagine a regular mailbox:
- Public Key (and Your Address) — This is the address of your mailbox, which is written on it. You can safely give this address to anyone so they can send you letters (cryptocurrency). Knowing only the address, no one can get into your mailbox and steal anything.
- Private Key — This is the physical key to your mailbox lock. Only you have it. Only with this key can you open the box and retrieve letters from it. If you lose this key or it is stolen, you will permanently lose access to your mailbox and all its contents.
In the world of cryptocurrencies, it’s exactly the same.
Public Key and Wallet Address
A public key is a long string of letters and numbers created using cryptography. It is used to verify the digital signature that you create with your private key. You will rarely directly encounter the public key.
For convenience, a shorter and more user-friendly wallet address is generated from the public key (for example, 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa). This is the address you provide to a pool for receiving payouts or to another person for transferring coins. It is completely safe to share.
Private Key: Your Main Secret
A private key is also a long string of characters, but it is your main secret. It is mathematical proof that you are indeed the owner of the coins at the corresponding address.
When you want to send cryptocurrency, your wallet uses the private key to create a unique digital signature for that transaction. The network verifies this signature using your public key and, if everything matches, confirms the operation.
Remember the main rule: never show your private key to anyone. He who possesses the private key, possesses the coins.
Seed Phrase: The Master Key to All Your Money
Memorizing or writing down a long and complex private key is inconvenient and unsafe. Therefore, modern wallets use a so-called seed phrase (or mnemonic phrase).
This is a sequence of 12 or 24 simple English words (for example, witch collapse practice feed shame open despair creek road again ice least).
The seed phrase is your private key, just in a human-friendly format. From this phrase, your wallet can mathematically restore all your private and public keys, and therefore, access to all your funds.
Security rules for a seed phrase:
- Write it down on paper. Write down your seed phrase on a piece of paper (in two or three copies) and hide it in different secure places.
- Never store it digitally. Do not take pictures of it, do not save it in notes on your phone, do not send it to yourself by email. Any internet-connected device is potentially vulnerable.
- Never enter it on websites. The only place you can enter a seed phrase is your hardware wallet or the official wallet application when restoring it.
If you lose your phone or computer with your wallet, but have your seed phrase, you can always restore access to your money on any other device. If you lose your seed phrase, you will lose your money forever.
