Question 1

What is Solana message signing?

Accepted Answer

Message signing uses your Solana wallet's private key to create a cryptographic Ed25519 signature that proves you control a specific wallet address — without making any blockchain transaction or paying any fees.

Question 2

Which wallets are supported?

Accepted Answer

This tool supports Phantom, Solflare, and Torus wallets, as well as any wallet that implements the Solana wallet standard's signMessage method.

Question 3

Does this cost anything or make transactions?

Accepted Answer

No. Message signing is completely free and happens entirely in your browser. No on-chain transactions are created, no SOL is spent, and nothing is sent to the blockchain.

Question 4

How does signature verification work?

Accepted Answer

Verification uses the Ed25519 elliptic curve algorithm (via the tweetnacl library) to mathematically confirm that a signature was produced by the private key corresponding to the given wallet address. The original message, the wallet's public key, and the signature are all required.

Question 5

Is my private key safe?

Accepted Answer

Yes. Your private key never leaves your wallet extension. When you sign a message, the signing operation happens inside the wallet (Phantom, Solflare, etc.) — this tool only receives the resulting signature.

Question 6

Can I share a verification link?

Accepted Answer

Yes. After signing a message, a shareable verification link is generated that contains the message, your wallet address, and the signature. Anyone with the link can verify the signature without needing a wallet.

Question 7

What is the signature format?

Accepted Answer

Signatures are 64-byte Ed25519 detached signatures encoded in Base58 format. The message is encoded as UTF-8 bytes before signing. This is the standard format used by Solana wallets.

Question 8

Can I use this for authentication (Sign-In With Solana)?

Accepted Answer

Yes. Message signing is the foundation of Sign-In With Solana (SIWS) and wallet-based authentication. A server can issue a challenge message, the user signs it with their wallet, and the server verifies the signature to confirm wallet ownership.

Question 9

Does this work on mobile?

Accepted Answer

Yes, this tool works on mobile devices when accessed through a wallet's built-in browser (such as the Phantom or Solflare mobile app browser) that supports the signMessage method.

Solana Message Signer

Sign Message

Frequently Asked Questions