Blockchain added

blockchain/hardhat.config.ts

@@ -0,0 +1,56 @@
+import { HardhatUserConfig } from "hardhat/config";
+import "@nomicfoundation/hardhat-toolbox";
+
+// ─────────────────────────────────────────────────
+// Hardhat Configuration
+// ─────────────────────────────────────────────────
+// This file configures the Solidity compiler and
+// network settings for our smart contract.
+//
+// Networks:
+//   - hardhat (default): In-memory local blockchain, free & instant
+//   - localhost: Persistent local node via `npx hardhat node`
+//   - sepolia: Ethereum testnet for demo/presentation
+// ─────────────────────────────────────────────────
+
+const config: HardhatUserConfig = {
+  solidity: {
+    version: "0.8.24",
+    settings: {
+      optimizer: {
+        enabled: true,
+        runs: 200,
+      },
+    },
+  },
+
+  networks: {
+    // Local persistent node (run `npx hardhat node` first)
+    localhost: {
+      url: "http://127.0.0.1:8545",
+    },
+
+    // Ethereum Sepolia testnet (free, for demo/jury presentation)
+    // Requires SEPOLIA_RPC_URL and DEPLOYER_PRIVATE_KEY in env
+    ...(process.env.SEPOLIA_RPC_URL
+      ? {
+          sepolia: {
+            url: process.env.SEPOLIA_RPC_URL,
+            accounts: process.env.DEPLOYER_PRIVATE_KEY
+              ? [process.env.DEPLOYER_PRIVATE_KEY]
+              : [],
+            chainId: 11155111,
+          },
+        }
+      : {}),
+  },
+
+  paths: {
+    sources: "./contracts",
+    tests: "./test",
+    cache: "./cache",
+    artifacts: "./artifacts",
+  },
+};
+
+export default config;