Adding Argent Specs

DEMOS/Demo-meta-tx-format.md

@@ -19,6 +19,7 @@ For now, join us on telegram for the discussion -> Found in the agenda above ^^^
 
 [Gnosis Safe](safe.gnosis.io.md) 
 
+[Argent Wallet](https://github.com/Meta-tx/Harbour-MVP/blob/master/DEMOS/argent.im.md)
 
 ## Important problems to solve
 

DEMOS/argent.im.md

@@ -0,0 +1,48 @@
+# Argent
+
+**Project Name**: 
+
+- Argent Wallet
+
+**Links of project**:
+
+- https://www.argent.im
+- https://medium.com/argenthq/decentralised-and-seedless-wallet-recovery-5fcf7dddd78d
+
+## Code
+
+### Meta-tx format
+
+#### Format 
+```
+{
+  address module, // the address of the wallet module that the relayer needs to call
+  address wallet, // the address of the wallet on behalf of which the call is made
+  bytes data, // the data of the call 
+  uint256 nonce, // a nonce to prevent replayability of the transaction
+  bytes signature // the concatenated signatures of the agents authorizing the transaction
+  uint256 gasPrice, // the gasPrice to use to refund the relayer (0 if no refund required)
+}
+```
+
+
+### Contract interface + Execution function
+```
+contract RelayerModule {
+    function execute(
+        address _wallet,
+        bytes _data, 
+        uint256 _nonce, 
+        bytes _signatures, 
+        uint256 _gasPrice
+    )
+        external
+        returns (bool success);
+}
+contract SomeWalletModule is RelayerModule {
+
+}
+```
+
+
+