Seed phrase vs private key, what is the difference?

A seed phrase and a private key are related but not the same thing. The seed phrase is the master backup of a whole wallet, and every private key in that wallet is calculated from it. A private key, by contrast, controls just one account. Solflare's help center sums it up by saying a private key usually controls one account, while a recovery phrase can restore a wallet with many.

Is a seed phrase the same as a private key?

No. Under the BIP-39 standard, a seed phrase is a set of 12 to 24 words that encodes random data plus a checksum. The wallet runs those words through a one-way function to produce a 512-bit seed.

That seed then feeds a second standard, BIP32, which Pieter Wuille proposed in February 2012. Trezor explains that BIP32 arranges keys in a tree that grows from one root, and the same root always produces the same keys. Paths defined in BIP44 split the tree by coin and account, so one phrase can hold keys for several networks and many addresses.

A private key is one leaf on that tree. It can be worked out from the seed phrase, but the seed phrase cannot be worked out from a private key. BIP-39 says the conversion runs one way only.

Private key vs recovery phrase, what can each restore?

The difference shows up when you move to a new wallet app.

• Entering the recovery phrase rebuilds the full wallet, with every account the app knows to look for. This is covered in using your seed phrase in another wallet.
• Importing a private key brings over only the single account that key controls. MetaMask says each account has its own private key, which can be used to import or export just that account.
• A wallet password is neither. MetaMask notes that its password only unlocks the app on one device and does not recover the wallet.

Seed phrase vs private key vs public key, how do they connect?

Think of a one-way chain of four links:

1. Seed phrase, the master backup.
2. Private key, one per account, derived from the seed.
3. Public key, calculated from the private key.
4. Address, usually derived from the public key, which is what people send funds to.

Each step is easy to go forward and not feasible to reverse. That is why an address can be shared with anyone, as our guide on sharing a wallet address explains, while the first two links must stay private.

Which one is more sensitive?

Both are dangerous to expose, but the scope differs. A leaked private key puts one account at risk. A leaked seed phrase puts every account derived from it at risk, on every network it covers. Trust Wallet calls the recovery phrase a master key for that reason.

MetaMask and Solflare both say their staff will never ask for either one. Anyone who does is attempting theft.