diff --git a/yarn-project/p2p/src/client/p2p_client.test.ts b/yarn-project/p2p/src/client/p2p_client.test.ts
index b4fbf816d64e..a205e677c3a9 100644
--- a/yarn-project/p2p/src/client/p2p_client.test.ts
+++ b/yarn-project/p2p/src/client/p2p_client.test.ts
@@ -1,4 +1,5 @@
 import { MockL2BlockSource } from '@aztec/archiver/test';
+import { Signature } from '@aztec/foundation/eth-signature';
 import { Fr } from '@aztec/foundation/fields';
 import { retryUntil } from '@aztec/foundation/retry';
 import { sleep } from '@aztec/foundation/sleep';
@@ -8,10 +9,10 @@ import { L2Block, randomPublishedL2Block } from '@aztec/stdlib/block';
 import { P2PClientType } from '@aztec/stdlib/p2p';
 import { mockTx } from '@aztec/stdlib/testing';
 
-import { expect } from '@jest/globals';
+import { expect, jest } from '@jest/globals';
 import { type MockProxy, mock } from 'jest-mock-extended';
 
-import type { P2PService } from '../index.js';
+import { InMemoryAttestationPool, type P2PService } from '../index.js';
 import type { AttestationPool } from '../mem_pools/attestation_pool/attestation_pool.js';
 import type { MemPools } from '../mem_pools/interface.js';
 import type { TxPool } from '../mem_pools/tx_pool/index.js';
@@ -19,7 +20,7 @@ import { P2PClient } from './p2p_client.js';
 
 describe('In-Memory P2P Client', () => {
   let txPool: MockProxy<TxPool>;
-  let attestationPool: MockProxy<AttestationPool>;
+  let attestationPool: AttestationPool;
   let mempools: MemPools;
   let blockSource: MockL2BlockSource;
   let p2pService: MockProxy<P2PService>;
@@ -35,7 +36,7 @@ describe('In-Memory P2P Client', () => {
 
     p2pService = mock<P2PService>();
 
-    attestationPool = mock<AttestationPool>();
+    attestationPool = new InMemoryAttestationPool();
 
     blockSource = new MockL2BlockSource();
     await blockSource.createBlocks(100);
@@ -236,15 +237,17 @@ describe('In-Memory P2P Client', () => {
       const advanceToProvenBlockNumber = 20;
       const keepAttestationsInPoolFor = 12;
 
+      const deleteAttestationsOlderThanSpy = jest.spyOn(attestationPool, 'deleteAttestationsOlderThan');
+
       blockSource.setProvenBlockNumber(0);
       (client as any).keepAttestationsInPoolFor = keepAttestationsInPoolFor;
       await client.start();
-      expect(attestationPool.deleteAttestationsOlderThan).not.toHaveBeenCalled();
+      expect(deleteAttestationsOlderThanSpy).not.toHaveBeenCalled();
 
       await advanceToProvenBlock(advanceToProvenBlockNumber);
 
-      expect(attestationPool.deleteAttestationsOlderThan).toHaveBeenCalledTimes(1);
-      expect(attestationPool.deleteAttestationsOlderThan).toHaveBeenCalledWith(
+      expect(deleteAttestationsOlderThanSpy).toHaveBeenCalledTimes(1);
+      expect(deleteAttestationsOlderThanSpy).toHaveBeenCalledWith(
         BigInt(advanceToProvenBlockNumber - keepAttestationsInPoolFor),
       );
     });
@@ -254,10 +257,22 @@ describe('In-Memory P2P Client', () => {
     it('adds attestations to the pool', async () => {
       await client.start();
       const block = await randomPublishedL2Block(1);
+      const addAttestationsSpy = jest.spyOn(attestationPool, 'addAttestations');
       await client.handleBlockStreamEvent({ type: 'blocks-added', blocks: [block] });
-      expect(attestationPool.addAttestations).toHaveBeenCalledWith(
+      expect(addAttestationsSpy).toHaveBeenCalledWith(
         block.signatures.map(signature => expect.objectContaining({ signature })),
       );
     });
+
+    it('handles empty signatures in block stream events', async () => {
+      await client.start();
+      const block = await randomPublishedL2Block(1);
+      block.signatures[0] = Signature.empty();
+      const addAttestationsSpy = jest.spyOn(attestationPool, 'addAttestations');
+      await client.handleBlockStreamEvent({ type: 'blocks-added', blocks: [block] });
+      expect(addAttestationsSpy).toHaveBeenCalledWith(
+        block.signatures.filter(sig => !sig.isEmpty).map(signature => expect.objectContaining({ signature })),
+      );
+    });
   });
 });
diff --git a/yarn-project/p2p/src/client/p2p_client.ts b/yarn-project/p2p/src/client/p2p_client.ts
index bfd1c5d41e88..0027d15dbee6 100644
--- a/yarn-project/p2p/src/client/p2p_client.ts
+++ b/yarn-project/p2p/src/client/p2p_client.ts
@@ -627,7 +627,7 @@ export class P2PClient<T extends P2PClientType = P2PClientType.Full>
   private async addAttestationsToPool(blocks: PublishedL2Block[]): Promise<void> {
     const attestations = blocks.flatMap(block => {
       const payload = ConsensusPayload.fromBlock(block.block);
-      return block.signatures.map(signature => new BlockAttestation(payload, signature));
+      return block.signatures.filter(sig => !sig.isEmpty).map(signature => new BlockAttestation(payload, signature));
     });
     await this.attestationPool?.addAttestations(attestations);
     const slots = blocks.map(b => b.block.header.getSlot()).sort((a, b) => Number(a - b));
diff --git a/yarn-project/stdlib/src/block/published_l2_block.ts b/yarn-project/stdlib/src/block/published_l2_block.ts
index ca4df4792559..c88e58a1a7d1 100644
--- a/yarn-project/stdlib/src/block/published_l2_block.ts
+++ b/yarn-project/stdlib/src/block/published_l2_block.ts
@@ -1,5 +1,6 @@
 import { Buffer32 } from '@aztec/foundation/buffer';
 import { times } from '@aztec/foundation/collection';
+import { Secp256k1Signer } from '@aztec/foundation/crypto';
 import { Signature } from '@aztec/foundation/eth-signature';
 import { schemas } from '@aztec/foundation/schemas';
 import { L2Block } from '@aztec/stdlib/block';
@@ -35,6 +36,10 @@ export async function randomPublishedL2Block(l2BlockNumber: number): Promise<Pub
     timestamp: block.header.globalVariables.timestamp.toBigInt(),
     blockHash: Buffer32.random().toString(),
   };
-  const signatures = times(3, Signature.random);
+  // Create valid signatures
+  const signers = times(3, () => Secp256k1Signer.random());
+  const signatures = await Promise.all(
+    times(3, async i => signers[i].signMessage(Buffer32.fromField(await block.hash()))),
+  );
   return { block, l1, signatures };
 }