Sign a raw hash

 request: (request: { method: 'secp256k1_sign', params: [hash: Hex] }) => Promise<HexString>

import {useWallets} from '@privy-io/react-auth';

const {wallets} = useWallets();
const wallet = wallets[0];

const provider = await wallet.getProvider();

// Sign raw hash
const response = await provider.request({
  method: 'secp256k1_sign',
  params: ['0xTheRawHash']
});

secp256k1Sign: async ({walletId: string, hash: string}) => Promise<{signature: string, encoding: 'hex'}>

const {signature, encoding} = await privy.walletApi.ethereum.secp256k1Sign({
  walletId: 'insert-wallet-id',
  hash: '0x6503b027a625549f7be691646404f275f149d17a119a6804b855bac3030037aa'
});

https://api.privy.io/v1/wallets/<wallet_id>/rpc

$ curl --request POST https://api.privy.io/v1/wallets/<wallet_id>/rpc \
-u "<your-privy-app-id>:<your-privy-app-secret>" \
-H "privy-app-id: <your-privy-app-id>" \
-H "privy-authorization-signature: <authorization-signature-for-request>" \
-H 'Content-Type: application/json' \
-d '{
  "chain_type": "ethereum",
  "method": "secp256k1_sign",
  "params": {
    "hash": "0x6503b027a625549f7be691646404f275f149d17a119a6804b855bac3030037aa",
    "encoding": "hex"
  }
}'