> For the complete documentation index, see [llms.txt](https://seekspeed.gitbook.io/seekspeed-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://seekspeed.gitbook.io/seekspeed-docs/security/solana.md).

# Solana Wallet Auth

A passwordless login path for users who already have a Solana wallet (Phantom or Solflare). No email, no OAuth bounce.

## Flow

```
1. Client requests a nonce from the server.
2. Server returns { nonce, issuedAt, expiresAt } and stores it server-side.
3. Wallet signs `SeekSpeed login: <nonce>` with the user's secret key.
4. Client posts { publicKey, signature } back.
5. Server verifies with tweetnacl.sign.detached.verify(...).
6. Server mints a Supabase session for the deterministic internal email
   `sol-<base58(pubkey)>@wallet.seekspeed.local`.
7. Client stores the session and proceeds.
```

## Server fn

```ts
// src/lib/solana-auth.functions.ts (excerpt)
export const exchangeSolanaSignature = createServerFn({ method: "POST" })
  .inputValidator((d) => Schema.parse(d))
  .handler(async ({ data }) => {
    const nonce = await consumeNonce(data.nonce);
    if (!nonce) throw new Error("nonce expired");

    const msg = new TextEncoder().encode(`SeekSpeed login: ${data.nonce}`);
    const sig = bs58.decode(data.signature);
    const pk  = bs58.decode(data.publicKey);
    if (!nacl.sign.detached.verify(msg, sig, pk)) {
      throw new Error("invalid signature");
    }

    const email = `sol-${data.publicKey.toLowerCase()}@wallet.seekspeed.local`;
    return mintOrLoginSupabaseSession(email);
  });
```

## Why this matters

For research teams running self-hosted inference on rented GPU pools, a wallet-based login removes the email round-trip and the password-management surface entirely. Same workspace model, same RLS, different credential.


---

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