remove sign and verify messages from FAQ

FAQ.md

@@ -114,45 +114,3 @@ This can happen if you try to use `signTransaction`, `signAllTransactions`, or `
 The other methods are optional APIs, so you have to feature-detect them before using them.
 
 Please see [issue #72](https://github.com/solana-labs/wallet-adapter/issues/72#issuecomment-919232595).
-
-## How can I sign and verify messages?
-
-Some wallet adapters provide a `signMessage` method for signing arbitrary bytes.
-
-The signature string returned by this method can be verified using [tweetnacl-js](https://github.com/dchest/tweetnacl-js/blob/master/README.md#naclsigndetachedverifymessage-signature-publickey) using the public key from the adapter.
-
-This can be used to sign offline — without sending a transaction — and prove a user controls a given private key.
-
-```tsx
-import { ed25519 } from '@noble/curves/ed25519';
-import { useWallet } from '@solana/wallet-adapter-react';
-import bs58 from 'bs58';
-import React, { FC, useCallback } from 'react';
-
-export const SignMessageButton: FC = () => {
-    const { publicKey, signMessage } = useWallet();
-
-    const onClick = useCallback(async () => {
-        try {
-            // `publicKey` will be null if the wallet isn't connected
-            if (!publicKey) throw new Error('Wallet not connected!');
-            // `signMessage` will be undefined if the wallet doesn't support it
-            if (!signMessage) throw new Error('Wallet does not support message signing!');
-
-            // Encode anything as bytes
-            const message = new TextEncoder().encode('Hello, world!');
-            // Sign the bytes using the wallet
-            const signature = await signMessage(message);
-            // FIXME: replace with `verifySignMessage`
-            // Verify that the bytes were signed using the private key that matches the known public key
-            if (!ed25519.verify(signature, message, publicKey.toBytes())) throw new Error('Invalid signature!');
-
-            alert(`Message signature: ${bs58.encode(signature)}`);
-        } catch (error: any) {
-            alert(`Signing failed: ${error?.message}`);
-        }
-    }, [publicKey, signMessage]);
-
-    return signMessage ? (<button onClick={onClick} disabled={!publicKey}>Sign Message</button>) : null;
-};
-```