AztecProtocol · fcarreiro · May 20, 2026 · May 18, 2026
diff --git a/yarn-project/p2p/src/client/test/p2p_client.integration_batch_txs.test.ts b/yarn-project/p2p/src/client/test/p2p_client.integration_batch_txs.test.ts
@@ -9,7 +9,7 @@ import { sleep } from '@aztec/foundation/sleep';
 import { emptyChainConfig } from '@aztec/stdlib/config';
 import type { WorldStateSynchronizer } from '@aztec/stdlib/interfaces/server';
 import { makeBlockHeader, makeBlockProposal, mockTx } from '@aztec/stdlib/testing';
-import { Tx, TxHash } from '@aztec/stdlib/tx';
+import { Tx, TxHash, type TxValidator } from '@aztec/stdlib/tx';
 
 import { describe, expect, it, jest } from '@jest/globals';
 import { type MockProxy, mock } from 'jest-mock-extended';
@@ -20,7 +20,6 @@ import type { AttestationPool } from '../../mem_pools/attestation_pool/attestati
 import type { TxPoolV2 } from '../../mem_pools/tx_pool_v2/interfaces.js';
 import { BatchTxRequester } from '../../services/reqresp/batch-tx-requester/batch_tx_requester.js';
 import type { BatchTxRequesterLibP2PService } from '../../services/reqresp/batch-tx-requester/interface.js';
-import type { IBatchRequestTxValidator } from '../../services/reqresp/batch-tx-requester/tx_validator.js';
 import type { ConnectionSampler } from '../../services/reqresp/connection-sampler/connection_sampler.js';
 import { RequestTracker } from '../../services/tx_collection/request_tracker.js';
 import { generatePeerIdPrivateKeys } from '../../test-helpers/generate-peer-id-private-keys.js';
@@ -39,7 +38,7 @@ describe('p2p client integration batch txs', () => {
 
   let mockP2PService: MockProxy<BatchTxRequesterLibP2PService>;
   let connectionSampler: MockProxy<ConnectionSampler>;
-  let txValidator: IBatchRequestTxValidator;
+  let txValidator: TxValidator;
 
   let logger: Logger;
   let p2pBaseConfig: P2PConfig;
@@ -58,8 +57,7 @@ describe('p2p client integration batch txs', () => {
       validateRequestedBlockTxsConsistency: () => Promise.resolve(true),
     });
     txValidator = {
-      validateRequestedTx: () => Promise.resolve({ result: 'valid' }),
-      validateRequestedTxs: txs => Promise.resolve(txs.map(() => ({ result: 'valid' }))),
+      validateTx: () => Promise.resolve({ result: 'valid' }),
     };
 
     logger = createLogger('p2p:test:integration:batch');

diff --git a/yarn-project/p2p/src/services/reqresp/batch-tx-requester/batch_tx_requester.test.ts b/yarn-project/p2p/src/services/reqresp/batch-tx-requester/batch_tx_requester.test.ts
@@ -10,7 +10,7 @@ import { sleep } from '@aztec/foundation/sleep';
 import { DateProvider } from '@aztec/foundation/timer';
 import { type BlockProposal, PeerErrorSeverity } from '@aztec/stdlib/p2p';
 import { makeBlockHeader, makeBlockProposal } from '@aztec/stdlib/testing';
-import { Tx, TxArray, TxHash, type TxValidationResult } from '@aztec/stdlib/tx';
+import { Tx, TxArray, TxHash, type TxValidationResult, type TxValidator } from '@aztec/stdlib/tx';
 
 import { describe, expect, it, jest } from '@jest/globals';
 import type { PeerId } from '@libp2p/interface';
@@ -26,16 +26,12 @@ import { BatchTxRequester } from './batch_tx_requester.js';
 import { DEFAULT_BATCH_TX_REQUESTER_BAD_PEER_THRESHOLD, DEFAULT_BATCH_TX_REQUESTER_TX_BATCH_SIZE } from './config.js';
 import type { BatchTxRequesterLibP2PService, IPeerPenalizer } from './interface.js';
 import { type IPeerCollection, PeerCollection, RATE_LIMIT_EXCEEDED_PEER_CACHE_TTL } from './peer_collection.js';
-import type { IBatchRequestTxValidator } from './tx_validator.js';
 
 /** Mock tx validator for testing that always returns valid */
-class AlwaysValidTxValidator implements IBatchRequestTxValidator {
-  validateRequestedTx(_tx: Tx): Promise<TxValidationResult> {
+class AlwaysValidTxValidator implements TxValidator {
+  validateTx(_tx: Tx): Promise<TxValidationResult> {
     return Promise.resolve({ result: 'valid' });
   }
-  validateRequestedTxs(txs: Tx[]): Promise<TxValidationResult[]> {
-    return Promise.resolve(txs.map(() => ({ result: 'valid' })));
-  }
 }
 
 const TEST_TIMEOUT = 15_000;
@@ -49,7 +45,7 @@ describe('BatchTxRequester', () => {
   let connectionSampler: MockProxy<ConnectionSampler>;
   let reqResp: MockProxy<ReqRespInterface>;
   let mockP2PService: MockProxy<BatchTxRequesterLibP2PService>;
-  let txValidator: IBatchRequestTxValidator;
+  let txValidator: TxValidator;
 
   beforeEach(async () => {
     logger = createLogger('test');
@@ -1191,13 +1187,12 @@ describe('BatchTxRequester', () => {
 
       const invalidTxIndices = new Set([2, 3, 7]); // Mark transactions at indices 2, 3, and 7 as invalid
 
-      const customValidator: IBatchRequestTxValidator = {
-        validateRequestedTx: (tx: Tx) => {
+      const customValidator: TxValidator = {
+        validateTx: (tx: Tx) => {
           const txIndex = missing.findIndex(h => h.equals(tx.txHash));
           const isInvalid = invalidTxIndices.has(txIndex);
           return Promise.resolve(isInvalid ? { result: 'invalid', reason: ['test invalid'] } : { result: 'valid' });
         },
-        validateRequestedTxs: (txs: Tx[]) => Promise.all(txs.map(tx => customValidator.validateRequestedTx(tx))),
       };
 
       const { mockImplementation } = createRequestLogger(blockProposal, new Set(), peerTransactions);
@@ -1271,13 +1266,12 @@ describe('BatchTxRequester', () => {
       // Validator that rejects transactions at specific indices
       // Even indices are rejected, odd indices are accepted
       const invalidTxIndices = new Set([0, 2, 4, 6, 8, 10]);
-      const mixedValidator: IBatchRequestTxValidator = {
-        validateRequestedTx: (tx: Tx) => {
+      const mixedValidator: TxValidator = {
+        validateTx: (tx: Tx) => {
           const txIndex = missing.findIndex(h => h.equals(tx.txHash));
           const isInvalid = invalidTxIndices.has(txIndex);
           return Promise.resolve(isInvalid ? { result: 'invalid', reason: ['test invalid'] } : { result: 'valid' });
         },
-        validateRequestedTxs: (txs: Tx[]) => Promise.all(txs.map(tx => mixedValidator.validateRequestedTx(tx))),
       };
 
       const { mockImplementation } = createRequestLogger(blockProposal, new Set(), peerTransactions);
@@ -1329,8 +1323,8 @@ describe('BatchTxRequester', () => {
       connectionSampler.getPeerListSortedByConnectionCountAsc.mockReturnValue([peer]);
 
       // Validator that throws errors for specific transactions
-      const throwingValidator: IBatchRequestTxValidator = {
-        validateRequestedTx: (tx: Tx) => {
+      const throwingValidator: TxValidator = {
+        validateTx: (tx: Tx) => {
           const txIndex = missing.findIndex(h => h.equals(tx.txHash));
 
           // Throw error for transactions at indices 1 and 3
@@ -1345,7 +1339,6 @@ describe('BatchTxRequester', () => {
 
           return Promise.resolve({ result: 'valid' });
         },
-        validateRequestedTxs: (txs: Tx[]) => Promise.all(txs.map(tx => throwingValidator.validateRequestedTx(tx))),
       };
 
       const peerTransactions = new Map([[peer.toString(), Array.from({ length: txCount }, (_, i) => i)]]);
@@ -1698,13 +1691,12 @@ describe('BatchTxRequester', () => {
 
       const invalidTxIndices = new Set([1, 6]); // Mark some transactions as invalid
 
-      const customValidator: IBatchRequestTxValidator = {
-        validateRequestedTx: (tx: Tx) => {
+      const customValidator: TxValidator = {
+        validateTx: (tx: Tx) => {
           const txIndex = missing.findIndex(h => h.equals(tx.txHash));
           const isInvalid = invalidTxIndices.has(txIndex);
           return Promise.resolve(isInvalid ? { result: 'invalid', reason: ['test invalid'] } : { result: 'valid' });
         },
-        validateRequestedTxs: (txs: Tx[]) => Promise.all(txs.map(tx => customValidator.validateRequestedTx(tx))),
       };
 
       const { mockImplementation } = createRequestLogger(blockProposal, new Set(), peerTransactions);

diff --git a/yarn-project/p2p/src/services/reqresp/batch-tx-requester/batch_tx_requester.ts b/yarn-project/p2p/src/services/reqresp/batch-tx-requester/batch_tx_requester.ts
@@ -4,7 +4,7 @@ import { FifoMemoryQueue, type ISemaphore, Semaphore } from '@aztec/foundation/q
 import { sleep } from '@aztec/foundation/sleep';
 import { DateProvider } from '@aztec/foundation/timer';
 import { PeerErrorSeverity } from '@aztec/stdlib/p2p';
-import { Tx, TxArray, TxHash } from '@aztec/stdlib/tx';
+import { Tx, TxArray, TxHash, type TxValidator } from '@aztec/stdlib/tx';
 
 import type { PeerId } from '@libp2p/interface';
 
@@ -21,7 +21,7 @@ import {
 import type { BatchTxRequesterLibP2PService, BatchTxRequesterOptions, ITxMetadataCollection } from './interface.js';
 import { MissingTxMetadataCollection } from './missing_txs.js';
 import { type IPeerCollection, PeerCollection } from './peer_collection.js';
-import { BatchRequestTxValidator, type IBatchRequestTxValidator } from './tx_validator.js';
+import { createBatchRequestTxValidator } from './tx_validator.js';
 
 /*
  * Tries to fetch all missing transaction until deadline is hit.
@@ -51,7 +51,7 @@ export class BatchTxRequester {
   private readonly txsMetadata: ITxMetadataCollection;
   private readonly smartRequesterSemaphore: ISemaphore;
   private readonly txQueue: FifoMemoryQueue<Tx>;
-  private readonly txValidator: IBatchRequestTxValidator;
+  private readonly txValidator: TxValidator;
   private readonly smartParallelWorkerCount: number;
   private readonly dumbParallelWorkerCount: number;
   private readonly txBatchSize: number;
@@ -78,7 +78,7 @@ export class BatchTxRequester {
       this.opts.dumbParallelWorkerCount ?? DEFAULT_BATCH_TX_REQUESTER_DUMB_PARALLEL_WORKER_COUNT;
     this.txBatchSize = this.opts.txBatchSize ?? DEFAULT_BATCH_TX_REQUESTER_TX_BATCH_SIZE;
     this.txQueue = new FifoMemoryQueue(this.logger);
-    this.txValidator = this.opts.txValidator ?? new BatchRequestTxValidator(this.p2pService.txValidatorConfig);
+    this.txValidator = this.opts.txValidator ?? createBatchRequestTxValidator(this.p2pService.txValidatorConfig);
 
     if (this.opts.peerCollection) {
       this.peers = this.opts.peerCollection;
@@ -509,7 +509,7 @@ export class BatchTxRequester {
     const validationResults = await Promise.allSettled(
       newTxs.map(async tx => ({
         tx,
-        isValid: (await this.txValidator.validateRequestedTx(tx)).result === 'valid',
+        isValid: (await this.txValidator.validateTx(tx)).result === 'valid',
       })),
     );
 

diff --git a/yarn-project/p2p/src/services/reqresp/batch-tx-requester/interface.ts b/yarn-project/p2p/src/services/reqresp/batch-tx-requester/interface.ts
@@ -1,14 +1,14 @@
 import type { ISemaphore } from '@aztec/foundation/queue';
 import type { PeerErrorSeverity } from '@aztec/stdlib/p2p';
-import type { Tx, TxHash } from '@aztec/stdlib/tx';
+import type { Tx, TxHash, TxValidator } from '@aztec/stdlib/tx';
 
 import type { PeerId } from '@libp2p/interface';
 
 import type { ConnectionSampler } from '../connection-sampler/connection_sampler.js';
 import type { BlockTxsRequest, BlockTxsResponse } from '../index.js';
 import type { ReqRespInterface } from '../interface.js';
 import type { IPeerCollection } from './peer_collection.js';
-import type { BatchRequestTxValidatorConfig, IBatchRequestTxValidator } from './tx_validator.js';
+import type { BatchRequestTxValidatorConfig } from './tx_validator.js';
 
 export interface IPeerPenalizer {
   penalizePeer(peerId: PeerId, penalty: PeerErrorSeverity): void;
@@ -57,5 +57,5 @@ export interface BatchTxRequesterOptions {
   semaphore?: ISemaphore;
   peerCollection?: IPeerCollection;
   /** Optional tx validator for testing - if not provided, one is created from p2pService.txValidatorConfig */
-  txValidator?: IBatchRequestTxValidator;
+  txValidator?: TxValidator;
 }
diff --git a/yarn-project/p2p/src/services/reqresp/batch-tx-requester/tx_validator.ts b/yarn-project/p2p/src/services/reqresp/batch-tx-requester/tx_validator.ts
@@ -1,5 +1,5 @@
 import type { ClientProtocolCircuitVerifier } from '@aztec/stdlib/interfaces/server';
-import { Tx, type TxValidationResult, type TxValidator } from '@aztec/stdlib/tx';
+import type { TxValidator } from '@aztec/stdlib/tx';
 
 import { createTxValidatorForOnDemandReceivedTxs } from '../../../msg_validators/index.js';
 
@@ -9,29 +9,9 @@ export interface BatchRequestTxValidatorConfig {
   proofVerifier: ClientProtocolCircuitVerifier;
 }
 
-export interface IBatchRequestTxValidator {
-  validateRequestedTx(tx: Tx): Promise<TxValidationResult>;
-  validateRequestedTxs(txs: Tx[]): Promise<TxValidationResult[]>;
-}
-
-export class BatchRequestTxValidator implements IBatchRequestTxValidator {
-  readonly txValidator: TxValidator;
-  constructor(private readonly config: BatchRequestTxValidatorConfig) {
-    this.txValidator = BatchRequestTxValidator.createRequestedTxValidator(this.config);
-  }
-
-  public async validateRequestedTx(tx: Tx): Promise<TxValidationResult> {
-    return await this.txValidator.validateTx(tx);
-  }
-
-  public async validateRequestedTxs(txs: Tx[]): Promise<TxValidationResult[]> {
-    return await Promise.all(txs.map(tx => this.validateRequestedTx(tx)));
-  }
-
-  static createRequestedTxValidator(config: BatchRequestTxValidatorConfig): TxValidator {
-    return createTxValidatorForOnDemandReceivedTxs(config.proofVerifier, {
-      l1ChainId: config.l1ChainId,
-      rollupVersion: config.rollupVersion,
-    });
-  }
+export function createBatchRequestTxValidator(config: BatchRequestTxValidatorConfig): TxValidator {
+  return createTxValidatorForOnDemandReceivedTxs(config.proofVerifier, {
+    l1ChainId: config.l1ChainId,
+    rollupVersion: config.rollupVersion,
+  });
 }
diff --git a/yarn-project/p2p/src/testbench/p2p_client_testbench_worker.ts b/yarn-project/p2p/src/testbench/p2p_client_testbench_worker.ts
@@ -23,7 +23,7 @@ import type { DataStoreConfig } from '@aztec/stdlib/kv-store';
 import { type BlockProposal, P2PMessage } from '@aztec/stdlib/p2p';
 import { ChonkProof } from '@aztec/stdlib/proofs';
 import { makeAztecAddress, makeBlockHeader, makeBlockProposal, mockTx } from '@aztec/stdlib/testing';
-import { Tx, TxHash, type TxValidationResult } from '@aztec/stdlib/tx';
+import { Tx, TxHash, type TxValidationResult, type TxValidator } from '@aztec/stdlib/tx';
 import { type TelemetryClient, getTelemetryClient } from '@aztec/telemetry-client';
 
 import type { Message, PeerId } from '@libp2p/interface';
@@ -38,7 +38,6 @@ import { LibP2PService } from '../services/index.js';
 import type { PeerManager } from '../services/peer-manager/peer_manager.js';
 import { BatchTxRequester } from '../services/reqresp/batch-tx-requester/batch_tx_requester.js';
 import type { BatchTxRequesterLibP2PService } from '../services/reqresp/batch-tx-requester/interface.js';
-import type { IBatchRequestTxValidator } from '../services/reqresp/batch-tx-requester/tx_validator.js';
 import { RateLimitStatus } from '../services/reqresp/rate-limiter/rate_limiter.js';
 import type { ReqResp } from '../services/reqresp/reqresp.js';
 import type { PeerDiscoveryService } from '../services/service.js';
@@ -276,10 +275,8 @@ async function runAggregatorBenchmark(
       }
     }
 
-    const noopTxValidator: IBatchRequestTxValidator = {
-      validateRequestedTx: (_tx: Tx): Promise<TxValidationResult> => Promise.resolve({ result: 'valid' }),
-      validateRequestedTxs: (txs: Tx[]): Promise<TxValidationResult[]> =>
-        Promise.resolve(txs.map(() => ({ result: 'valid' }))),
+    const noopTxValidator: TxValidator = {
+      validateTx: (_tx: Tx): Promise<TxValidationResult> => Promise.resolve({ result: 'valid' }),
     };
 
     timer = new Timer();