Added batching contract

contracts/batchingProxy.sol

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.6.8;
+pragma experimental ABIEncoderV2;
+
+interface IndexInterface {
+  function master() external view returns (address);
+}
+
+contract Registry {
+
+  event LogAddSigner(address indexed signer);
+  event LogRemoveSigner(address indexed signer);
+  
+  event LogSuccess(address indexed flusher, bytes callData);
+  event LogFailed(address indexed flusher, bytes callData);
+
+
+  IndexInterface public constant instaIndex = IndexInterface(0x2971AdFa57b20E5a416aE5a708A8655A9c74f723);
+
+  mapping (address => bool) public signer;
+
+  modifier isMaster() {
+    require(msg.sender == instaIndex.master(), "not-master");
+    _;
+  }
+
+  modifier isSigner() {
+    require(signer[msg.sender], "not-chief");
+    _;
+  }
+
+  /**
+    * @dev Enable New Signer.
+    * @param _signer Address of the new signer.
+  */
+  function enableSigner(address _signer) external isMaster {
+      require(_signer != address(0), "invalid-address");
+      require(!signer[_signer], "signer-already-enabled");
+      signer[_signer] = true;
+      emit LogAddSigner(_signer);
+  }
+
+  /**
+    * @dev Disable Signer.
+    * @param _signer Address of the existing signer.
+  */
+  function disableSigner(address _signer) external isMaster {
+      require(_signer != address(0), "invalid-address");
+      require(signer[_signer], "signer-already-disabled");
+      delete signer[_signer];
+      emit LogRemoveSigner(_signer);
+  }
+
+  function batchTx(address[] memory flushers, bytes[] memory calldatas) external isSigner {
+    require(flushers.length == calldatas.length, "not-same-length");
+    for (uint i = 0; i < flushers.length; i++) {
+        (bool status, ) = payable(flushers[i]).call(calldatas[i]);
+        if (status) emit LogSuccess(flushers[i], calldatas[i]);
+        else emit LogFailed(flushers[i], calldatas[i]);
+    }
+  }
+}