const snapId = `npm:@hashgraph/hedera-wallet-snap`

const signMessageAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'signMessage',
        params: {
          network: 'testnet',
          message: 'Hello there, this is a sample message. ',
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 5.67332072,
            "timestamp": "Wed, 13 Mar 2024 20:37:05 GMT",
            "tokens": {
                "0.0.3590430": {
                    "balance": 1,
                    "decimals": 1,
                    "tokenId": "0.0.3590430",
                    "name": "Token1",
                    "symbol": "KP1",
                    "tokenType": "FUNGIBLE_COMMON",
                    "supplyType": "INFINITE",
                    "totalSupply": "100",
                    "maxSupply": "0"
                }
            }
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "signature": "0x6ecceeaf7e3b81151893827b123a6409445d625dee9c986f29044aa979cf992f0fc3ef426655bc0a074c7de59bec742c72faf00bc5f594316836d2c64ea81e0f1b"
}