> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getpara.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sign Messages with Cosmos Libraries

> Sign direct and amino messages using CosmJS with Para wallets

export const Card = ({imgUrl, title, description, href, horizontal = false, newTab = false}) => {
  const [isHovered, setIsHovered] = useState(false);
  const handleClick = e => {
    e.preventDefault();
    if (newTab) {
      window.open(href, '_blank', 'noopener,noreferrer');
    } else {
      window.location.href = href;
    }
  };
  return <div className={`not-prose relative my-2 p-[1px] rounded-xl transition-all duration-300 ${isHovered ? 'bg-gradient-to-r from-[#FF4E00] to-[#874AE3]' : 'bg-gray-200'}`} onMouseEnter={() => setIsHovered(true)} onMouseLeave={() => setIsHovered(false)}>
      <a href={href} onClick={handleClick} className={`not-prose flex ${horizontal ? 'flex-row' : 'flex-col'} font-normal h-full bg-white overflow-hidden w-full cursor-pointer rounded-[11px] no-underline`}>
        {imgUrl && <div className={`relative overflow-hidden flex-shrink-0 ${horizontal ? 'w-[30%] rounded-l-[11px]' : 'w-full'}`} onClick={e => e.stopPropagation()}>
            <img src={imgUrl} alt={title} className="w-full h-full object-cover pointer-events-none select-none" draggable="false" />
            <div className="absolute inset-0 pointer-events-none" />
          </div>}
        <div className={`flex-grow px-6 py-5 ${horizontal ? 'w-[70%]' : 'w-full'} flex flex-col ${horizontal && imgUrl ? 'justify-center' : 'justify-start'}`}>
          {title && <h2 className="font-semibold text-base text-gray-800 m-0">{title}</h2>}
          {description && <div className={`font-normal text-gray-500 re leading-6 ${horizontal || !imgUrl ? 'mt-0' : 'mt-1'}`}>
              <p className="m-0 text-xs">{description}</p>
            </div>}
        </div>
      </a>
    </div>;
};

Sign arbitrary messages for authentication or verification using CosmJS with Para wallets in React Native.

## Prerequisites

<Card title="Setup CosmJS Libraries" description="Configure CosmJS with Para SDK first" href="/v2/react-native/guides/web3-operations/cosmos/setup-libraries" icon="gear" horizontal />

## Sign Messages

Sign arbitrary messages using the ADR-036 standard for Cosmos authentication.

```typescript theme={null}
import { useMutation } from '@tanstack/react-query';
import { View, Text, Button } from 'react-native';
import { useParaCosmjsAminoSigner } from '@getpara/react-native-wallet/cosmos';
import { makeSignDoc } from '@cosmjs/amino';

const CHAIN_ID = 'cosmoshub-4';

function MessageSigning() {
  const { aminoSigner, isLoading } = useParaCosmjsAminoSigner();
  const address = aminoSigner?.address;

  const { mutate: signMessage, data: signature, isPending } = useMutation({
    mutationFn: async () => {
      if (!aminoSigner || !address) throw new Error('Signer not ready');
      const message = 'Sign this message to authenticate with Para';
      const signDoc = makeSignDoc(
        [{ type: 'sign/MsgSignData', value: { signer: address, data: btoa(message) } }],
        { amount: [], gas: '0' },
        CHAIN_ID,
        '',
        0,
        0
      );
      const { signature: sig } = await aminoSigner.signAmino(address, signDoc);
      return sig.signature;
    },
  });

  if (isLoading) return <Text>Loading...</Text>;

  return (
    <View>
      <Text>Address: {address}</Text>
      <Button
        title={isPending ? 'Signing...' : 'Sign Message'}
        onPress={() => signMessage()}
        disabled={!aminoSigner || isPending}
      />
      {signature && <Text>Signature: {signature}</Text>}
    </View>
  );
}
```

## Next Steps

<CardGroup cols={3}>
  <Card title="Verify Signatures" description="Verify signed messages and authenticate users" href="/v2/react-native/guides/web3-operations/cosmos/verify-signatures" icon="shield-check" />

  <Card title="Execute Transactions" description="Send signed transactions to the network" href="/v2/react-native/guides/web3-operations/cosmos/execute-transactions" icon="bolt" />

  <Card title="Stake Tokens" description="Sign delegation transactions" href="/v2/react-native/guides/web3-operations/cosmos/stake-tokens" icon="coins" />
</CardGroup>