diff --git a/packages/amino/src/encoding.spec.ts b/packages/amino/src/encoding.spec.ts
index 0a056e9826..387e075953 100644
--- a/packages/amino/src/encoding.spec.ts
+++ b/packages/amino/src/encoding.spec.ts
@@ -1,5 +1,6 @@
 import { Random } from "@cosmjs/crypto";
 import { fromBase64, fromBech32, fromHex } from "@cosmjs/encoding";
+import { TSError } from "ts-node";
 
 import {
   decodeAminoPubkey,
@@ -131,6 +132,17 @@ describe("encoding", () => {
 
       expect(() => decodeAminoPubkey(fromHex("22C1F7E20705"))).toThrowError(/expecting 0x08 prefix/i);
     });
+
+    it("throws error for invalid secp256k1 pubkey length", () => {
+      const data = new Uint8Array([0, 1, 2, 3, 4]);
+      try {
+        decodeAminoPubkey(data);
+      } catch (error) {
+        expect((error as TSError).message).toBe(
+          "Unsupported public key type. Amino data starts with: 0001020304",
+        );
+      }
+    });
   });
 
   describe("decodeBech32Pubkey", () => {
diff --git a/packages/amino/src/secp256k1hdwallet.spec.ts b/packages/amino/src/secp256k1hdwallet.spec.ts
index 493e12bdc9..86958543ad 100644
--- a/packages/amino/src/secp256k1hdwallet.spec.ts
+++ b/packages/amino/src/secp256k1hdwallet.spec.ts
@@ -3,7 +3,7 @@ import { Secp256k1, Secp256k1Signature, sha256 } from "@cosmjs/crypto";
 import { fromBase64, fromHex } from "@cosmjs/encoding";
 
 import { makeCosmoshubPath } from "./paths";
-import { extractKdfConfiguration, Secp256k1HdWallet } from "./secp256k1hdwallet";
+import { extractKdfConfiguration, isDerivationJson, Secp256k1HdWallet } from "./secp256k1hdwallet";
 import { serializeSignDoc, StdSignDoc } from "./signdoc";
 import { base64Matcher } from "./testutils.spec";
 import { executeKdf, KdfConfiguration } from "./wallet";
@@ -311,4 +311,46 @@ describe("Secp256k1HdWallet", () => {
       });
     });
   });
+
+  describe("isDerivationJson function", () => {
+    it("returns true for valid DerivationInfoJson", () => {
+      const validInput: unknown = {
+        hdPath: "validHdPath",
+        prefix: "validPrefix",
+      };
+      expect(isDerivationJson(validInput)).toBe(true);
+    });
+
+    it("returns false for undefined input", () => {
+      expect(isDerivationJson(undefined)).toBe(false);
+    });
+
+    it("returns false for null input", () => {
+      expect(isDerivationJson(null)).toBe(false);
+    });
+
+    it("returns false for non-object input", () => {
+      expect(isDerivationJson(42)).toBe(false);
+    });
+
+    it("returns false for missing hdPath property", () => {
+      const missingHdPath: unknown = {};
+      expect(isDerivationJson(missingHdPath)).toBe(false);
+    });
+
+    it("returns false for missing prefix property", () => {
+      const missingPrefix: unknown = {
+        hdPath: "validHdPath",
+      };
+      expect(isDerivationJson(missingPrefix)).toBe(false);
+    });
+
+    it("returns false for incorrect hdPath type", () => {
+      const incorrectHdPathType: unknown = {
+        hdPath: 123,
+        prefix: "validPrefix",
+      };
+      expect(isDerivationJson(incorrectHdPathType)).toBe(false);
+    });
+  });
 });
diff --git a/packages/amino/src/secp256k1hdwallet.ts b/packages/amino/src/secp256k1hdwallet.ts
index c65644c09b..8aada72aed 100644
--- a/packages/amino/src/secp256k1hdwallet.ts
+++ b/packages/amino/src/secp256k1hdwallet.ts
@@ -71,7 +71,7 @@ interface DerivationInfoJson {
   readonly prefix: string;
 }
 
-function isDerivationJson(thing: unknown): thing is DerivationInfoJson {
+export function isDerivationJson(thing: unknown): thing is DerivationInfoJson {
   if (!isNonNullObject(thing)) return false;
   if (typeof (thing as DerivationInfoJson).hdPath !== "string") return false;
   if (typeof (thing as DerivationInfoJson).prefix !== "string") return false;
diff --git a/packages/cli/src/helpers.spec.ts b/packages/cli/src/helpers.spec.ts
index 6571d3cf40..65fa9dafea 100644
--- a/packages/cli/src/helpers.spec.ts
+++ b/packages/cli/src/helpers.spec.ts
@@ -1,6 +1,7 @@
+import { TSError } from "ts-node";
 import { createContext } from "vm";
 
-import { executeJavaScript, executeJavaScriptAsync } from "./helpers";
+import { executeJavaScript, executeJavaScriptAsync, isRecoverable } from "./helpers";
 
 describe("Helpers", () => {
   describe("executeJavaScript", () => {
@@ -144,4 +145,22 @@ describe("Helpers", () => {
       expect(await executeJavaScriptAsync(code, "myfile.js", context)).toEqual("job done");
     });
   });
+
+  describe("isRecoverable", () => {
+    it("should return true for recoverable errors", () => {
+      const recoverableError = {
+        diagnosticCodes: [1003, 1160, 2355],
+      } as TSError;
+
+      expect(isRecoverable(recoverableError)).toBe(true);
+    });
+
+    it("should return false for non-recoverable errors", () => {
+      const nonRecoverableError = {
+        diagnosticCodes: [1234, 5678],
+      } as TSError;
+
+      expect(isRecoverable(nonRecoverableError)).toBe(false);
+    });
+  });
 });