What is a Crypto Public Key
- Last Updated: October 6, 2026
Table of Contents
Definition
A Public Key is a Cryptographic Key used in asymmetric encryption schemes, such as the RSA or Elliptic Curve Cryptography (ECC), used to encrypt data or verify Digital Signatures.
Additional Explanation
In cryptocurrencies, a public key is derived from a user’s private key and is essential to the blockchain network. While it is openly shared and used by others primarily to verify digital signatures created by the corresponding private key, this sharing can raise privacy concerns.
Public keys are crucial for securely conducting cryptocurrency transactions, as they allow participants to authenticate transactions and verify ownership without revealing sensitive information, such as the private key.
However, these keys’ public nature means they can be linked to specific individuals or addresses, potentially compromising user privacy.
As a result, users often employ additional measures, such as pseudonymous addresses or techniques like hierarchical deterministic wallets, to enhance their privacy on the blockchain.
Important: This content is for educational purposes only. Always verify information and do your own research before making decisions.
The Public Key and Cryptocurrency Security
The public key is an important component of cryptocurrency security for the following reasons:
– Authentication: The public key is used to authenticate transactions on the cryptocurrency network. When a user sends a transaction, it is signed with their private key and broadcast to the network. The transaction can then be authenticated by other users on the network using the sender’s public key.
– Encryption: The public key is also used to encrypt messages on the cryptocurrency network. When a user wants to send a private message to another user, they can encrypt it using the recipient’s public key. The message can only be decrypted using the recipient’s private key, ensuring that the message remains secure and private.
– Address Generation: The public key is used to generate the public address associated with a cryptocurrency wallet. The public address is a string of characters that other users can use to send cryptocurrency to the wallet. The public address is derived from the public key and is unique to each wallet, ensuring that cryptocurrency can only be sent to the correct wallet.
– Non-Repudiation: Public key cryptography also provides non-repudiation, meaning that a user cannot deny having sent a transaction because their digital signature is linked to their public key.
Why you Should not Reveal your Public Keys
If someone knows your public key, this person can check what crypto assets you own or even the transactions you have made.
For example, Blockchair is a blockchain explorer that you can use to explore data stored in 19 blockchains.
And if you take one of your public keys or public addresses, with a Blockchain explorer you can discover all your transactions history and how much crypto that public key or public address holds.
If you make a transaction from a wallet containing your main portfolio, you must be aware that revealing the wallet’s public key to the blockchain. And the person receiving the transaction will have enough information to discover your public key using a blockchain explorer.
While revealing your public key to the Blockchain is harmless enough, you may not want that the receiver can check the portfolio you have associated with that public key.
When Possible, Share your Public Address Instead of your Crypto Public Key
You better share your public address if you need to receive crypto assets.
A wallet public key can generate a near-unlimited number of wallet addresses, and each wallet address can be used as a one-time destination address to receive crypto assets.
Nobody can find your wallet’s public key from a public address.
It is a good practice to use public addresses as a one-time destination address, or even for a few transactions, for privacy. Better if other people have limited information about what crypto assets you hold.
On the other hand, if you need to send crypto assets, you cannot avoid your public key being revealed to the blockchain and the receiver.
If you are concerned about revealing your public key because you hold many crypto assets, you may want to set up a new wallet and fund it with the assets you need for your day-to-day transactions.
This way, nor the receiver nor anyone snooping on the blockchain will be able to find out the whole extent of your crypto portfolio.
But managing what gets exposed—and what doesn’t—goes beyond public keys. That’s where the Three-Wallet Model™ comes in.
Where Can I Find my Wallet Public Key
Usually, wallets do not display the public key to the users, and finding your wallet’s public key is somewhat tricky.
But you don’t need to know the public key anyway:
– Your wallet automatically performs any task that requires to use of your public key.
– As mentioned, sharing your public key is not a good practice anyway, so you don’t need to know it.
If you are still curious about public keys and want a practical approach to learning more about them, try creating a Bitcoin paper wallet at bitaddress.org
You will see your Bitcoin paper wallet private key and public address details on the ‘Single Wallet’ tab. But you will notice that the Bitcoin paper wallet public key is missing.
But if you copy the private key and paste it into the ‘Wallet Details’ tab, you will be able to see the public key details.
Because with a private key, it is possible to derive a public key.
A final warning, while paper wallets generator is a very useful resource, you must only use them if you are a very advanced user. There are risks involved in creating and using paper wallets, so for 99% of the crypto users, there are much safer wallets available.
The safest crypto wallet
What is the Difference Between a Public Key and a Public Address?
While the public key is used for cryptography and generating public addresses, the public address is used solely for receiving cryptocurrency payments.
Frequently Asked Questions (FAQ)
A public key is generated using a cryptographic algorithm from a private key.
The process involves creating a large, random number (the private key) and then applying an elliptic curve cryptographic function to generate the corresponding public key.
This ensures a secure and unique key pair.
The main uses of a public key include receiving funds, verifying digital signatures, and encrypting data.
In blockchain transactions, the public key creates a public address where others can send cryptocurrency.
It also helps ensure that transactions are sent to the correct recipient.
A public key is meant to be shared openly to receive transactions, while a private key is kept secret and used to sign transactions, proving ownership and authorization.
The private key must remain confidential as it grants control over the funds or data associated with the corresponding public key.
No, a public key cannot be used to derive the private key.
The relationship between the public and private keys is one-way due to the cryptographic algorithms used (such as elliptic curve cryptography).
This ensures that the private key remains secure even if a public key is known.
A private key signs a transaction or message in digital signatures, creating a unique signature.
The corresponding public key is used to verify this signature, ensuring the message’s authenticity and integrity.
This process confirms that the sender owns the private key without revealing it.
Sharing a public key is generally safe and necessary for receiving transactions or encrypted messages.
However, the public key must be accurately shared to prevent funds from being sent to the wrong address.
The security of the corresponding private key is crucial to maintaining overall security.
Yes, public keys can be used for encryption. Only your private key can decrypt when someone encrypts a message with your public key.
This ensures secure communication, as only the intended recipient (who holds the private key) can read the encrypted message.
In smart contracts, public keys are used to identify participants and verify signatures.
They enable the secure execution of contract terms, ensuring only authorized parties can trigger certain actions.
Public keys also facilitate transparent and verifiable interactions within decentralized applications.
Public keys can have different representations depending on the blockchain network.
For example, in Bitcoin, public keys are often compressed and displayed as a shorter string, while in Ethereum, they appear as a 64-character hexadecimal string prefixed with “0x”.
These representations ensure compatibility with each network’s protocols.
Users should consider using a secure wallet to manage their public and private keys, ensuring their private keys remain confidential.
They should regularly back up their keys and use strong, unique passwords.
It’s also important to understand the key management features of their chosen blockchain platform to maintain security.
How to Keep your Crypto Assets Safe
Now that you clearly understand what a public key is, you may be interested in increasing your knowledge and learning about digital safety and how to keep your digital assets safe.
And don’t forget to also learn about digital safety good practices because the more good digital safety practices you follow, the more secure your digital assets will be.
Now let’s turn this knowledge into action.
Start Here: Protect Your Crypto the Right Way
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