diff --git a/src/types.ts b/src/types.ts
index 6c77a64..e05955a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,7 +1,8 @@
 import {
+  assert,
   assertArgument,
   BigNumberish,
-  BytesLike,
+  BytesLike, defineProperties,
   ethers,
   Signature as EthersSignature,
   TransactionRequest as EthersTransactionRequest,
@@ -136,14 +137,16 @@ export interface MessageProof {
  */
 export class TransactionResponse extends ethers.TransactionResponse {
   /** The batch number on the L1 network. */
-  readonly l1BatchNumber: null | number;
+  readonly l1BatchNumber!: null | number;
   /** The transaction index within the batch on the L1 network. */
-  readonly l1BatchTxIndex: null | number;
+  readonly l1BatchTxIndex!: null | number;
 
   constructor(params: any, provider: ethers.Provider) {
     super(params, provider);
-    this.l1BatchNumber = params.l1BatchNumber;
-    this.l1BatchTxIndex = params.l1BatchTxIndex;
+    defineProperties<TransactionResponse>(this, {
+      l1BatchNumber: params.l1BatchNumber,
+      l1BatchTxIndex: params.l1BatchTxIndex
+    });
   }
 
   /**
@@ -167,7 +170,7 @@ export class TransactionResponse extends ethers.TransactionResponse {
   }
 
   override async getTransaction(): Promise<TransactionResponse> {
-    return (await super.getTransaction()) as TransactionResponse;
+    return await super.getTransaction() as TransactionResponse;
   }
 
   override replaceableTransaction(startBlock: number): TransactionResponse {
@@ -178,7 +181,7 @@ export class TransactionResponse extends ethers.TransactionResponse {
   }
 
   override async getBlock(): Promise<Block> {
-    return (await super.getBlock()) as Block;
+    return await super.getBlock() as Block;
   }
 
   /** Waits for transaction to be finalized. */
@@ -216,20 +219,23 @@ export class TransactionResponse extends ethers.TransactionResponse {
  */
 export class TransactionReceipt extends ethers.TransactionReceipt {
   /** The batch number on the L1 network. */
-  readonly l1BatchNumber: null | number;
+  readonly l1BatchNumber!: null | number;
   /** The transaction index within the batch on the L1 network. */
-  readonly l1BatchTxIndex: null | number;
+  readonly l1BatchTxIndex!: null | number;
   /** The logs of L2 to L1 messages. */
-  readonly l2ToL1Logs: L2ToL1Log[];
+  readonly l2ToL1Logs!: L2ToL1Log[];
   /** All logs included in the transaction receipt. */
-  readonly _logs: ReadonlyArray<Log>;
+  readonly #logs: ReadonlyArray<Log>;
 
   constructor(params: any, provider: ethers.Provider) {
     super(params, provider);
-    this.l1BatchNumber = params.l1BatchNumber;
-    this.l1BatchTxIndex = params.l1BatchTxIndex;
-    this.l2ToL1Logs = params.l2ToL1Logs;
-    this._logs = Object.freeze(
+    defineProperties<TransactionReceipt>(this, {
+      l1BatchNumber: params.l1BatchNumber,
+      l1BatchTxIndex: params.l1BatchTxIndex,
+      l2ToL1Logs: params.l2ToL1Logs,
+    });
+
+    this.#logs = Object.freeze(
       params.logs.map((log: Log) => {
         return new Log(log, provider);
       })
@@ -237,7 +243,7 @@ export class TransactionReceipt extends ethers.TransactionReceipt {
   }
 
   override get logs(): ReadonlyArray<Log> {
-    return this._logs;
+    return this.#logs;
   }
 
   override getBlock(): Promise<Block> {
@@ -262,33 +268,78 @@ export class TransactionReceipt extends ethers.TransactionReceipt {
 /** A `Block` is an extension of {@link ethers.Block} with additional features for interacting with zkSync Era. */
 export class Block extends ethers.Block {
   /** The batch number on L1. */
-  readonly l1BatchNumber: null | number;
+  readonly l1BatchNumber!: null | number;
   /** The timestamp of the batch on L1. */
-  readonly l1BatchTimestamp: null | number;
+  readonly l1BatchTimestamp!: null | number;
+
+  readonly #transactions: Array<string | TransactionResponse>;
 
   constructor(params: any, provider: ethers.Provider) {
     super(params, provider);
-    this.l1BatchNumber = params.l1BatchNumber;
-    this.l1BatchTimestamp = params.l1BatchTxIndex;
+    this.#transactions = params.transactions.map((tx: TransactionResponse | string) => {
+      if (typeof(tx) !== "string") {
+        return new TransactionResponse(tx, provider);
+      }
+      return tx;
+    });
+    defineProperties<Block>(this, {
+      l1BatchNumber:  params.l1BatchNumber,
+      l1BatchTimestamp:  params.l1BatchTimestamp
+    });
   }
 
   override toJSON(): any {
-    const {l1BatchNumber, l1BatchTimestamp: l1BatchTxIndex} = this;
+    const {l1BatchNumber, l1BatchTimestamp} = this;
     return {
       ...super.toJSON(),
       l1BatchNumber,
-      l1BatchTxIndex,
+      l1BatchTimestamp,
     };
   }
 
   override get prefetchedTransactions(): TransactionResponse[] {
-    return super.prefetchedTransactions as TransactionResponse[];
+    const txs = this.#transactions.slice();
+
+    // Doesn't matter...
+    if (txs.length === 0) { return [ ]; }
+
+    // Make sure we prefetched the transactions
+    assert(typeof(txs[0]) === "object", "transactions were not prefetched with block request", "UNSUPPORTED_OPERATION", {
+      operation: "transactionResponses()"
+    });
+
+    return txs as TransactionResponse[];
   }
 
-  override getTransaction(
+  override async getTransaction(
     indexOrHash: number | string
   ): Promise<TransactionResponse> {
-    return super.getTransaction(indexOrHash) as Promise<TransactionResponse>;
+    // Find the internal value by its index or hash
+    let tx: string | TransactionResponse | undefined = undefined;
+    if (typeof(indexOrHash) === "number") {
+      tx = this.#transactions[indexOrHash];
+
+    } else {
+      const hash = indexOrHash.toLowerCase();
+      for (const v of this.#transactions) {
+        if (typeof(v) === "string") {
+          if (v !== hash) { continue; }
+          tx = v;
+          break;
+        } else {
+          if (v.hash === hash) { continue; }
+          tx = v;
+          break;
+        }
+      }
+    }
+    if (tx == null) { throw new Error("no such tx"); }
+
+    if (typeof(tx) === "string") {
+      return <TransactionResponse>(await this.provider.getTransaction(tx));
+    } else {
+      return tx;
+    }
   }
 }
 
@@ -317,15 +368,15 @@ export class Log extends ethers.Log {
   }
 
   override async getBlock(): Promise<Block> {
-    return (await super.getBlock()) as Block;
+    return await super.getBlock() as Block;
   }
 
   override async getTransaction(): Promise<TransactionResponse> {
-    return (await super.getTransaction()) as TransactionResponse;
+    return await super.getTransaction() as TransactionResponse;
   }
 
   override async getTransactionReceipt(): Promise<TransactionReceipt> {
-    return (await super.getTransactionReceipt()) as TransactionReceipt;
+    return await super.getTransactionReceipt() as TransactionReceipt;
   }
 }