Private Key
A secret cryptographic code that proves ownership of a blockchain address and authorizes transactions.
Your private key is essentially the password to your crypto. Anyone who has it can move your funds. Unlike a bank password, it can't be reset or recovered. It's a long string of characters generated when you create a wallet.
In practice, most people never see their raw private key. Wallets manage it behind the scenes. What you do interact with is the seed phrase (a set of 12 or 24 words) that can regenerate your private key. Keep both absolutely secure and never share them with anyone.
Related Terms
Seed Phrase (Recovery Phrase)
A set of 12 or 24 words that can restore your crypto wallet and all its private keys. Also called a recovery phrase or mnemonic.
Wallet
Software or hardware that stores your private keys and lets you send, receive, and manage cryptocurrency.
Self-Custody
Holding your own private keys, giving you full control over your cryptocurrency without relying on a third party.
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This definition is provided for educational purposes. USDC.org is an independent resource and is not affiliated with Circle Internet Financial.