Added token to convert from ERC20 to ERC721

config/contracts.json

@@ -59,13 +59,13 @@
       "RootChain": {
         "args": ["$ValidatorManagerContract"]
       },
-      "CryptoCards": {
-        "args": ["$RootChain"],
-        "onDeploy": ["ValidatorManagerContract.methods.toggleToken($CryptoCards).send()"]
+      "CryptoCards": { "deploy": false },
+      "PlasmaERC20":{ "deploy": false },
+      "PlasmaSNT": {
+        "instanceOf": "PlasmaERC20",
+        "args": ["$RootChain", "$SNT", "5000000000000000000", "PlasmaSNT", "PSNT"],
+        "onDeploy": ["ValidatorManagerContract.methods.toggleToken($PlasmaSNT).send()"]
       }
-
-
-
     }
   },
   "testnet":{

contracts/plasma/PlasmaERC20.sol

@@ -0,0 +1,63 @@
+pragma solidity ^0.4.24;
+
+import "openzeppelin-solidity/contracts/token/ERC721/ERC721Token.sol";
+import "../common/Owned.sol";
+import "../token/ERC20Token.sol";
+
+contract PlasmaERC20 is ERC721Token, Owned {
+
+    address plasma;
+    ERC20Token token;
+    uint exchangeRate;
+
+    constructor (address _plasma, 
+                 address _token, 
+                 uint _exchangeRate,
+                 string _name, 
+                 string _symbol
+                 ) 
+    ERC721Token(_name, _symbol)
+    public {
+        plasma = _plasma;
+        token = ERC20Token(_token);
+        exchangeRate = _exchangeRate;
+    }
+
+    mapping(uint => uint) ERC20Balances;
+    
+    function depositERC20() public {
+        require(token.allowance(msg.sender, address(this)) >= exchangeRate);
+        require(token.transferFrom(msg.sender, address(this), exchangeRate));
+
+        uint256 tokenId = allTokens.length + 1;
+        ERC20Balances[tokenId] = exchangeRate;
+        _mint(msg.sender, tokenId);
+    }
+
+    function withdrawERC20(uint tokenId) public {
+        require(ownerOf(tokenId) == msg.sender);
+        uint erc20Value = ERC20Balances[tokenId];
+        ERC20Balances[tokenId] = 0;
+        _burn(msg.sender, tokenId);
+        require(token.transferFrom(address(this), msg.sender, erc20Value));
+    }
+
+    function depositToPlasmaWithData(uint tokenId, bytes _data) public {
+        require(plasma != address(0));
+        safeTransferFrom(
+            msg.sender,
+            plasma,
+            tokenId,
+            _data);
+    }
+
+    function depositToPlasma(uint tokenId) public {
+        require(plasma != address(0));
+        safeTransferFrom(msg.sender, plasma, tokenId);
+    }
+
+    function setExchangeRate(uint _newRate) onlyOwner public {
+        exchangeRate = _newRate;
+    }
+
+}