diff --git a/.changeset/odd-shoes-wash.md b/.changeset/odd-shoes-wash.md
new file mode 100644
index 0000000000..91fb61c00e
--- /dev/null
+++ b/.changeset/odd-shoes-wash.md
@@ -0,0 +1,5 @@
+---
+"@hyperlane-xyz/utils": minor
+---
+
+Adds the serialized_signature field to the S3Announcement type.
diff --git a/typescript/infra/scripts/validators/strk-announce.ts b/typescript/infra/scripts/validators/strk-announce.ts
new file mode 100644
index 0000000000..21ae02d3db
--- /dev/null
+++ b/typescript/infra/scripts/validators/strk-announce.ts
@@ -0,0 +1,168 @@
+import { Account, CallData, ETransactionVersion3 } from 'starknet';
+import yargs from 'yargs';
+
+import { getValidatorFromStorageLocation } from '@hyperlane-xyz/sdk';
+import { hexOrBase58ToHex } from '@hyperlane-xyz/utils';
+
+import { Contexts } from '../../config/contexts.js';
+import { AgentGCPKey } from '../../src/agents/gcp.js';
+import { Role } from '../../src/roles.js';
+import { getEnvironmentConfig } from '../core-utils.js';
+
+// Convert storage location to felt252 array (31 bytes max per felt)
+function stringToFeltArray(str: string): string[] {
+  const chunks: string[] = [];
+  for (let i = 0; i < str.length; i += 31) {
+    const chunk = str.slice(i, i + 31);
+    const hex = '0x' + Buffer.from(chunk).toString('hex');
+    chunks.push(hex);
+  }
+  return chunks;
+}
+
+// Convert signature to proper Starknet Bytes format
+function signatureToBytes(sig: string): any[] {
+  const sigHex = sig.slice(2);
+  const sigBytes = Buffer.from(sigHex, 'hex');
+
+  // Bytes format: [size, ...packed_u128_chunks]
+  // Each u128 chunk contains 16 bytes, padded if necessary
+  const size = sigBytes.length;
+  const padding = (16 - (size % 16)) % 16;
+  const paddedBytes = new Uint8Array([...sigBytes, ...new Uint8Array(padding)]);
+
+  const chunks: string[] = [];
+  for (let i = 0; i < paddedBytes.length; i += 16) {
+    const chunk = new Uint8Array(paddedBytes.slice(i, i + 16));
+    const u128Value = BigInt('0x' + Buffer.from(chunk).toString('hex'));
+    chunks.push(u128Value.toString());
+  }
+
+  return [size.toString(), ...chunks];
+}
+
+async function announceValidator() {
+  const { chain, location } = await yargs(process.argv.slice(2))
+    .describe('chain', 'chain on which to register')
+    .choices('chain', ['starknet', 'paradex'])
+    .demandOption('chain')
+    .describe(
+      'location',
+      'location, e.g. s3://hyperlane-testnet4-sepolia-validator-0/us-east-1',
+    )
+    .string('location')
+    .demandOption('location').argv;
+
+  const envConfig = getEnvironmentConfig('mainnet3');
+  const registry = await envConfig.getRegistry();
+  const addresses = await registry.getChainAddresses(chain);
+  if (!addresses) {
+    throw new Error(`No addresses found for chain ${chain}`);
+  }
+
+  const mpp = await envConfig.getMultiProtocolProvider();
+  const provider = mpp.getStarknetProvider(chain);
+
+  const validator = await getValidatorFromStorageLocation(location);
+  const { value: announcement, serialized_signature } =
+    await validator.getSignedAnnouncement();
+  console.log('Announcement:', announcement);
+  console.log('Serialized signature:', serialized_signature);
+
+  // Prepare calldata manually
+  const storageChunks = stringToFeltArray(announcement.storage_location);
+  const sigBytes = signatureToBytes(serialized_signature);
+
+  console.log('Storage chunks:', storageChunks);
+  console.log('Signature bytes structure:');
+  console.log('  Size (bytes):', sigBytes[0]);
+  console.log('  Packed u128 chunks:', sigBytes.slice(1));
+
+  // Use CallData to properly encode the parameters
+  const calldata = CallData.compile({
+    _validator: announcement.validator,
+    _storage_location: storageChunks,
+    _signature: {
+      size: parseInt(sigBytes[0]),
+      data: sigBytes.slice(1),
+    },
+  });
+
+  console.log('\nFull calldata:', calldata);
+
+  // First, simulate the call
+  console.log('\nSimulating call...');
+  try {
+    const result = await provider.callContract({
+      contractAddress: addresses.validatorAnnounce,
+      entrypoint: 'announce',
+      calldata: calldata,
+    });
+    console.log('✅ Simulation successful:', result);
+  } catch (error: any) {
+    console.error('❌ Simulation failed:');
+    if (error.baseError?.data?.revert_error) {
+      const hex = error.baseError.data.revert_error;
+      const ascii = Buffer.from(hex.slice(2), 'hex').toString('ascii');
+      console.error('  Error message:', ascii);
+    }
+    console.error(error);
+    return;
+  }
+
+  // Then execute the transaction
+  console.log('\nExecuting transaction...');
+  try {
+    // Create account from private key
+    const deployer = new AgentGCPKey(
+      'mainnet3',
+      Contexts.Hyperlane,
+      Role.Deployer,
+      chain,
+    );
+    await deployer.fetch();
+    const account = new Account(
+      provider,
+      hexOrBase58ToHex(deployer.address),
+      hexOrBase58ToHex(deployer.privateKey),
+    );
+
+    // Execute the transaction with resource bounds
+    const result = await account.execute(
+      {
+        contractAddress: addresses.validatorAnnounce,
+        entrypoint: 'announce',
+        calldata: calldata,
+      },
+      {
+        resourceBounds: {
+          l1_gas: {
+            max_amount: '0x100000', // 1048576 - much higher for complex computation
+            max_price_per_unit: '0x3b9aca00', // 1 gwei in wei (1000000000)
+          },
+          l2_gas: {
+            max_amount: '0x1000000', // 16777216 - much higher for complex computation
+            max_price_per_unit: '0x3b9aca00', // 1 gwei in wei (1000000000)
+          },
+          l1_data_gas: {
+            max_amount: '0x10000', // 65536 - higher for data processing
+            max_price_per_unit: '0x3b9aca00', // 1 gwei in wei (1000000000)
+          },
+        },
+      },
+    );
+
+    console.log('✅ Transaction submitted:', result.transaction_hash);
+    console.log('Waiting for confirmation...');
+
+    // Wait for transaction to be confirmed
+    await provider.waitForTransaction(result.transaction_hash);
+    console.log('✅ Transaction confirmed!');
+  } catch (error: any) {
+    console.error('❌ Transaction failed:');
+    console.error(error);
+    return;
+  }
+}
+
+announceValidator().catch(console.error);
diff --git a/typescript/utils/src/types.ts b/typescript/utils/src/types.ts
index 92ef0dc1cb..d45ea6224b 100644
--- a/typescript/utils/src/types.ts
+++ b/typescript/utils/src/types.ts
@@ -75,6 +75,7 @@ export type S3CheckpointWithId = {
 export type S3Announcement = {
   value: Announcement;
   signature: SignatureLike;
+  serialized_signature: string;
 };
 
 export type S3Checkpoint = {