diff --git a/blog/mina-berkeley/contracts/Learn2EarnWorker.ts b/blog/mina-berkeley/contracts/Learn2EarnWorker.ts
index 16260ab..986860a 100644
--- a/blog/mina-berkeley/contracts/Learn2EarnWorker.ts
+++ b/blog/mina-berkeley/contracts/Learn2EarnWorker.ts
@@ -12,9 +12,9 @@ import {
   PublicKey,
   Signature,
 } from "o1js";
-import { Learn2Earn, Learn2EarnContract } from "./Learn2Earn";
+import { Learn2Earn, Learn2EarnContract, LEARN2EARN } from "./Learn2Earn";
 
-console.log("Worker loaded and parsed");
+const NODE_HOSTNAME = "mina.kimlikdao.org";
 
 console.time("compiling Learn2Earn");
 
@@ -24,11 +24,13 @@ const Learn2EarnCompiled = Learn2EarnContract.compile().then(() => {
 });
 
 const Network = Mina.Network("https://api.minascan.io/node/devnet/v1/graphql");
-console.log("Devnet network instance configured.");
 Mina.setActiveInstance(Network);
+console.log("Devnet network instance configured.");
 
-const getWitness = (humanIDv1Id: bigint) =>
-  Promise.resolve(new HumanIDv1Witness(new MerkleTree(33).getWitness(humanIDv1Id & 0xffffffffn)));
+const getWitness = (humanIDv1Id: bigint): Promise<HumanIDv1Witness> =>
+  fetch(`https://${NODE_HOSTNAME}/witness/${LEARN2EARN}/${(humanIDv1Id & 0xffffffffn).toString(16)}`)
+    .then((res) => res.json())
+    .then((data) => new HumanIDv1Witness(data));
 
 const blindingCommit = (sender: PublicKey) => {
   const commitmentR = Field.random();
@@ -53,8 +55,8 @@ const signHumanIDv1 = (humanIDv1Id: bigint, sender: PublicKey): HumanIDv1 => {
 onmessage = async (event) => {
   const sender = readPublicKey(event.data);
   const humanIDv1 = signHumanIDv1(100n, sender); // HumanIDv1.fromBytes(event.data.subarray(33));
+  const [witness] = await Promise.all([getWitness(humanIDv1.id.toBigInt()), Learn2EarnCompiled]);
 
-  const witness = await getWitness(humanIDv1.id.toBigInt());
   const tx = await Mina.transaction(sender, () =>
     Learn2Earn.claimReward(humanIDv1, witness)
   );
diff --git a/blog/mina-berkeley/tsconfig.json b/blog/mina-berkeley/tsconfig.json
deleted file mode 100644
index ac7661d..0000000
--- a/blog/mina-berkeley/tsconfig.json
+++ /dev/null
@@ -1,32 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "esnext",
-    "module": "esnext",
-    "lib": [
-      "dom",
-      "esnext"
-    ],
-    "outDir": "./build",
-    "rootDir": ".",
-    "strict": true,
-    "strictPropertyInitialization": false, // to enable generic constructors, e.g. on CircuitValue
-    "skipLibCheck": true,
-    "forceConsistentCasingInFileNames": true,
-    "esModuleInterop": true,
-    "moduleResolution": "node",
-    "experimentalDecorators": true,
-    "emitDecoratorMetadata": true,
-    "allowJs": true,
-    "declaration": true,
-    "sourceMap": true,
-    "noFallthroughCasesInSwitch": true,
-    "allowSyntheticDefaultImports": true,
-    "useDefineForClassFields": false,
-  },
-  "include": [
-    "./contracts",
-  ],
-  "exclude": [
-    "./build"
-  ]
-}
\ No newline at end of file