Plain English
Your public key (or its address) is the account number you give people so they can send you crypto. Your private key is the password that lets you spend it. Sharing the public side is fine. Sharing the private side is total loss.
How it actually works
Crypto wallets use public-key cryptography. A random private key is generated; from it, math derives a public key, and from the public key, an address. The relationship is one-way — you can go private → public, but not public → private without breaking elliptic-curve cryptography (which has not happened in 40+ years of trying).
When you “send” crypto, your wallet signs the transaction with the private key. The network verifies the signature using the public key. Funds move. The private key never leaves the device. The signature proves ownership without revealing the secret.
What it means for you
Every wallet operation reduces to one question: who holds the private keys? If an exchange holds them, they own your crypto and can freeze it. If you hold them, you own it and they cannot. The seed phrase exists because remembering a 64-character private key is impossible — the seed encodes it as words.
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Educational content only. Not investment, tax, or legal advice.