Phantom Auth is a secure, privacy-first way to sign in to Phantom—without using a password.
It works like an authentication factor (similar to a passkey), using public-key cryptography—the same kind of cryptography used to secure blockchain transactions on Solana, Ethereum, Base, and Bitcoin.
Phantom Auth helps Phantom safely store and sync certain offchain settings (like usernames and account icons) across your devices, without needing to know who you are.
How Phantom Auth works
Phantom Auth works similarly to your wallet accounts.
- Your wallet addresses are derived from your recovery phrase (seed phrase).
- Phantom also derives a separate, unique authentication key pair from that same recovery phrase.
- When you sign in, Phantom uses that authentication key to sign an anonymous message.
- Phantom verifies the signature to confirm you control the matching private key—without learning your identity.
This is the same sign-and-verify flow used for blockchain transactions.
What data does Phantom sync?
When you’re signed in with Phantom Auth, Phantom can securely sync certain account personalization across your devices, including:
- Your username (linked to your Phantom Auth public key).
- Wallet details, like account names, avatars, and icons for linked accounts.
For example, if you set up Phantom on mobile and the browser extension using the same recovery phrase, you’ll see the same username and account avatars on both.
What can I do with Phantom Auth?
Phantom Auth lets you use your wallet like any other. You can:
- Add SOL or other tokens
- Send and receive assets
- Swap tokens
- Connect to apps
You can also create a wallet from scratch using only a Google or Apple account—no seed phrase required at onboarding.
What auth factors are supported
The following are the supported auth factors:
- Wallets created with a recovery phrase (seed phrase)
- Wallets created with Google and Apple accounts (seedless)
- Wallets imported with private keys
The following aren't supported auth factors:
- Solana Mobile wallets on Saga or Seeker (Seed Vault)
- Phantom KMS wallets
- Ledger hardware wallets
- Watch-only addresses