diff --git a/uport.org.md b/uport.org.md
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+### Format 
+```
+{
+  uint8 sigV,
+  bytes32 sigR,
+  bytes32 sigS,
+  address destination,
+  bytes data,
+  address listOwner
+}
+```
+
+### Rx 
+```
+{
+  Coming Soon
+}
+```
+
+### Tx
+```
+{
+  // only allow senders from the whitelist specified by the user,
+  // 0x0 means no whitelist.
+  require(listOwner == 0x0 || whitelist[listOwner][msg.sender]);
+
+  address claimedSender = getAddress(data);
+  // use EIP 191
+  // 0x19 :: version :: relay :: whitelistOwner :: nonce :: destination :: data
+  bytes32 h = keccak256(byte(0x19), byte(0), this, listOwner, nonce[claimedSender], destination, data);
+  address addressFromSig = ecrecover(h, sigV, sigR, sigS);
+
+  require(claimedSender == addressFromSig);
+
+  nonce[claimedSender]++; //if we are going to do tx, update nonce
+
+  require(destination.call(data));
+}
+```