> ## 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
Sign arbitrary messages for authentication or verification using CosmJS with Para wallets in React Native.
## Prerequisites
## 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 Loading...;
return (
Address: {address}
);
}
```
## Next Steps