useFutureverseSigner() - Initializes the signer in your application, enabling functionalities such as signing messages, transactions, and extrinsics. This is useful for Web3 applications that require authentication or transaction signing.

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Examples:

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Importing and initializing the signer:

import { useFutureverseSigner } from '@futureverse/auth-react';

...
const { signer } = useFutureverseSigner();

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Signing a message:

You can use the signer to sign a simple message, as shown in the following example: 
import { useCallback } from 'react';
import { useFutureverseSigner } from './useFutureverseSigner';

function MessageSignerDemo() {
  const { signer } = useFutureverseSigner();

  const signExtrinsic = useCallback(async () => {
    if (!signer) return;
    const message = 'message to sign';
    return await signer.signMessage(message);
  }, [signer]);

  // Your UI code to call signExtrinsic
  return <></>;
}

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Signing a Root Network extrinsic:

This example demonstrates how to use the signer for signing a TRN extrinsic, such as minting an NFT: 
import { useFutureverse, useTrnApi } from '@futureverse/react';
import { useCallback } from 'react';
import { useFutureverseSigner } from './useFutureverseSigner';

function ExtrinsicSignerDemo() {
  const { userSession } = useFutureverse();
  const { trnApi } = useTrnApi();
  const { signer } = useFutureverseSigner();

  const signExtrinsic = useCallback(async () => {
    if (!trnApi || !signer || !userSession) {
      return;
    }
    const collectionId = '<your collection id>';
    const numberOfTokens = 1; // How many tokens to mint
    const address = 'FuturePass or address to mint to';
    const extrinsic = trnApi.tx.nft.mint(collectionId, numberOfTokens, address);
    return await signer.signExtrinsic(trnApi, extrinsic, userSession.eoa);
  }, [signer]);

  // Your UI code to call signExtrinsic
  return <></>;
}