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When a web application is connected to Phantom, it can also request that the user signs a given message. Applications are free to write their own messages which will be displayed to users from within Phantom’s signature prompt. Message signatures do not involve network fees and are a convenient way for apps to verify ownership of an address. 
try {
    const encodedMessage = new TextEncoder().encode(message);
    const signature = await provider.signMessage(encodedMessage, address);
    return signature;
} catch (error) {
    throw new Error(error instanceof Error ? error.message : 'Failed to sign message');
}