1  ### Format 
 2  ```
 3  {
 4    uint8 sigV,
 5    bytes32 sigR,
 6    bytes32 sigS,
 7    address destination,
 8    bytes data,
 9    address listOwner
10  }
11  ```
12  
13  ### Rx 
14  ```
15  {
16    Coming Soon
17  }
18  ```
19  
20  ### Tx
21  ```
22  {
23    // only allow senders from the whitelist specified by the user,
24    // 0x0 means no whitelist.
25    require(listOwner == 0x0 || whitelist[listOwner][msg.sender]);
26  
27    address claimedSender = getAddress(data);
28    // use EIP 191
29    // 0x19 :: version :: relay :: whitelistOwner :: nonce :: destination :: data
30    bytes32 h = keccak256(byte(0x19), byte(0), this, listOwner, nonce[claimedSender], destination, data);
31    address addressFromSig = ecrecover(h, sigV, sigR, sigS);
32  
33    require(claimedSender == addressFromSig);
34  
35    nonce[claimedSender]++; //if we are going to do tx, update nonce
36  
37    require(destination.call(data));
38  }
39  ```