diff --git a/packages/sdk/src/cosmwasmclient.spec.ts b/packages/sdk/src/cosmwasmclient.spec.ts
index 27ff42e3..80a5b9a2 100644
--- a/packages/sdk/src/cosmwasmclient.spec.ts
+++ b/packages/sdk/src/cosmwasmclient.spec.ts
@@ -3,6 +3,7 @@ import { makeSignBytes, marshalTx } from "./encoding";
 import { findAttribute } from "./logs";
 import { Secp256k1Pen } from "./pen";
 import { RestClient } from "./restclient";
+import cosmoshub from "./testdata/cosmoshub.json";
 import { getRandomizedHackatom, makeRandomAddress } from "./testutils.spec";
 import { Coin, MsgSend, StdFee } from "./types";
 
@@ -59,6 +60,14 @@ describe("CosmWasmClient", () => {
     });
   });
 
+  describe("getIdentifier", () => {
+    it("works", async () => {
+      pendingWithoutCosmos();
+      const client = CosmWasmClient.makeReadOnly(httpUrl);
+      expect(await client.getIdentifier(cosmoshub.tx)).toEqual(cosmoshub.id);
+    });
+  });
+
   describe("postTx", () => {
     it("works", async () => {
       pendingWithoutCosmos();
diff --git a/packages/sdk/src/cosmwasmclient.ts b/packages/sdk/src/cosmwasmclient.ts
index f1c191e7..d0ff8a94 100644
--- a/packages/sdk/src/cosmwasmclient.ts
+++ b/packages/sdk/src/cosmwasmclient.ts
@@ -1,3 +1,4 @@
+import { Sha256 } from "@iov/crypto";
 import { Encoding } from "@iov/encoding";
 
 import { makeSignBytes, marshalTx } from "./encoding";
@@ -5,6 +6,7 @@ import { findAttribute, Log, parseLogs } from "./logs";
 import { RestClient } from "./restclient";
 import {
   Coin,
+  CosmosSdkTx,
   MsgExecuteContract,
   MsgInstantiateContract,
   MsgStoreCode,
@@ -106,6 +108,16 @@ export class CosmWasmClient {
     return response.node_info.network;
   }
 
+  /**
+   * Returns a 32 byte upper-case hex transaction hash (typically used as the transaction ID)
+   */
+  public async getIdentifier(tx: CosmosSdkTx): Promise<string> {
+    // We consult the REST API because we don't have a local amino encoder
+    const bytes = await this.restClient.encodeTx(tx);
+    const hash = new Sha256(bytes).digest();
+    return Encoding.toHex(hash).toUpperCase();
+  }
+
   /**
    * Returns account number and sequence.
    *
diff --git a/packages/sdk/types/cosmwasmclient.d.ts b/packages/sdk/types/cosmwasmclient.d.ts
index bee7e6a2..4fae10bd 100644
--- a/packages/sdk/types/cosmwasmclient.d.ts
+++ b/packages/sdk/types/cosmwasmclient.d.ts
@@ -1,5 +1,5 @@
 import { Log } from "./logs";
-import { Coin, StdSignature } from "./types";
+import { Coin, CosmosSdkTx, StdSignature } from "./types";
 export interface SigningCallback {
   (signBytes: Uint8Array): Promise<StdSignature>;
 }
@@ -25,6 +25,10 @@ export declare class CosmWasmClient {
   private get signCallback();
   private constructor();
   chainId(): Promise<string>;
+  /**
+   * Returns a 32 byte upper-case hex transaction hash (typically used as the transaction ID)
+   */
+  getIdentifier(tx: CosmosSdkTx): Promise<string>;
   /**
    * Returns account number and sequence.
    *