From d653425d0a273c3bf7d6881da0c6f55155481955 Mon Sep 17 00:00:00 2001
From: Andres Aiello <aaiello@gmail.com>
Date: Wed, 25 Sep 2024 13:28:20 -0300
Subject: [PATCH] Create proof of liveness smart contract

---
 .../proof-of-liveness/ProofOfLiveness.sol     | 60 +++++++++++++++++++
 .../zevm-app-contracts/data/addresses.json    |  3 +-
 .../scripts/proof-of-liveness/deploy.ts       | 33 ++++++++++
 3 files changed, 95 insertions(+), 1 deletion(-)
 create mode 100644 packages/zevm-app-contracts/contracts/proof-of-liveness/ProofOfLiveness.sol
 create mode 100644 packages/zevm-app-contracts/scripts/proof-of-liveness/deploy.ts

diff --git a/packages/zevm-app-contracts/contracts/proof-of-liveness/ProofOfLiveness.sol b/packages/zevm-app-contracts/contracts/proof-of-liveness/ProofOfLiveness.sol
new file mode 100644
index 0000000..a90fbd3
--- /dev/null
+++ b/packages/zevm-app-contracts/contracts/proof-of-liveness/ProofOfLiveness.sol
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+contract ProofOfLiveness {
+    // Mapping to track the last time the user proved liveness
+    mapping(address => uint256) public lastProofTimestamp;
+
+    // Custom error for when a user has already proved liveness within the last 24 hours
+    error ProofWithinLast24Hours(uint256 lastProofTime);
+
+    // Event to log when liveness is proved
+    event LivenessProved(address indexed user, uint256 proofTimestamp);
+
+    // The function to prove liveness, can only be called once every 24 hours
+    function proveLiveness() external {
+        uint256 currentTime = block.timestamp;
+        uint256 lastProofTime = lastProofTimestamp[msg.sender];
+
+        // Check if the user has proved liveness within the last 24 hours
+        if (currentTime < lastProofTime + 24 hours) {
+            revert ProofWithinLast24Hours(lastProofTime);
+        }
+
+        // Update the last proof timestamp for the user
+        lastProofTimestamp[msg.sender] = currentTime;
+
+        // Emit an event to track the liveness proof
+        emit LivenessProved(msg.sender, currentTime);
+    }
+
+    // Helper function to check if a user can prove liveness (returns true if 24 hours have passed)
+    function canProveLiveness(address user) external view returns (bool) {
+        uint256 currentTime = block.timestamp;
+        return currentTime >= lastProofTimestamp[user] + 24 hours;
+    }
+
+    // View function to return the liveness proof status for the last 5 periods (each 24 hours long)
+    function getLastFivePeriodsStatus(address user) external view returns (bool[5] memory) {
+        uint256 currentTime = block.timestamp;
+        uint256 lastProofTime = lastProofTimestamp[user];
+
+        bool[5] memory proofStatus;
+        uint256 periodDuration = 24 hours;
+
+        for (uint256 i = 0; i < 5; i++) {
+            // Calculate the start of the period (going back i * 24 hours)
+            uint256 periodStart = currentTime - (i * periodDuration);
+            uint256 periodEnd = periodStart - periodDuration;
+
+            // If the last proof timestamp falls within this period, mark it as true
+            if (lastProofTime >= periodEnd && lastProofTime < periodStart) {
+                proofStatus[i] = true;
+            } else {
+                proofStatus[i] = false;
+            }
+        }
+
+        return proofStatus;
+    }
+}
diff --git a/packages/zevm-app-contracts/data/addresses.json b/packages/zevm-app-contracts/data/addresses.json
index 94022ab..8499573 100644
--- a/packages/zevm-app-contracts/data/addresses.json
+++ b/packages/zevm-app-contracts/data/addresses.json
@@ -8,7 +8,8 @@
       "invitationManager": "0x3649C03C472B698213926543456E9c21081e529d",
       "withdrawERC20": "0xa349B9367cc54b47CAb8D09A95836AE8b4D1d84E",
       "ZetaXP": "0x5c25b6f4D2b7a550a80561d3Bf274C953aC8be7d",
-      "InstantRewards": "0x10DfEd4ba9b8F6a1c998E829FfC0325D533c80E3"
+      "InstantRewards": "0x10DfEd4ba9b8F6a1c998E829FfC0325D533c80E3",
+      "ProofOfLiveness": "0x2aD64D83827D102FCBBdEb92DEA91fCAB168Cdc2"
     },
     "zeta_mainnet": {
       "disperse": "0x23ce409Ea60c3d75827d04D9db3d52F3af62e44d",
diff --git a/packages/zevm-app-contracts/scripts/proof-of-liveness/deploy.ts b/packages/zevm-app-contracts/scripts/proof-of-liveness/deploy.ts
new file mode 100644
index 0000000..5a35f89
--- /dev/null
+++ b/packages/zevm-app-contracts/scripts/proof-of-liveness/deploy.ts
@@ -0,0 +1,33 @@
+import { isProtocolNetworkName } from "@zetachain/protocol-contracts";
+import { ethers, network } from "hardhat";
+
+import { ProofOfLiveness__factory } from "../../typechain-types";
+import { saveAddress } from "../address.helpers";
+import { verifyContract } from "../explorer.helpers";
+
+const networkName = network.name;
+
+const deployProofOfLiveness = async () => {
+  if (!isProtocolNetworkName(networkName)) throw new Error("Invalid network name");
+
+  const ProofOfLivenessFactory = (await ethers.getContractFactory("ProofOfLiveness")) as ProofOfLiveness__factory;
+  const ProofOfLiveness = await ProofOfLivenessFactory.deploy();
+
+  await ProofOfLiveness.deployed();
+
+  console.log("ProofOfLiveness deployed to:", ProofOfLiveness.address);
+
+  saveAddress("ProofOfLiveness", ProofOfLiveness.address, networkName);
+
+  await verifyContract(ProofOfLiveness.address, []);
+};
+
+const main = async () => {
+  if (!isProtocolNetworkName(networkName)) throw new Error("Invalid network name");
+  await deployProofOfLiveness();
+};
+
+main().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});