Create multi_party_escrow.sol

network/blockchain/contracts/multi_party_escrow/multi_party_escrow.sol

@@ -0,0 +1,48 @@
+pragma solidity ^0.8.0;
+
+contract MultiPartyEscrow {
+    address[] public parties;
+    mapping (address => uint) public deposits;
+    mapping (address => bool) public hasFulfilled;
+    uint public totalDeposits;
+    uint public requiredDeposits;
+    uint public deadline;
+
+    constructor(address[] memory _parties, uint _requiredDeposits, uint _deadline) public {
+        parties = _parties;
+        requiredDeposits = _requiredDeposits;
+        deadline = _deadline;
+    }
+
+    function deposit() public payable {
+        require(msg.sender!= address(0), "Invalid sender");
+        require(deposits[msg.sender] == 0, "Already deposited");
+        deposits[msg.sender] = msg.value;
+        totalDeposits += msg.value;
+        if (totalDeposits >= requiredDeposits) {
+            executeAgreement();
+        }
+    }
+
+    function fulfillObligation() public {
+        require(hasFulfilled[msg.sender] == false, "Already fulfilled");
+        hasFulfilled[msg.sender] = true;
+        if (allPartiesHaveFulfilled()) {
+            executeAgreement();
+        }
+    }
+
+    function executeAgreement() internal {
+        // execute the agreement logic here
+        // e.g. transfer funds, update state, etc.
+    }
+
+    function allPartiesHaveFulfilled() internal view returns (bool) {
+        for (uint i = 0; i < parties.length; i++) {
+            if (!hasFulfilled[parties[i]]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}