diff --git a/package-lock.json b/package-lock.json
index 3eb8628..cb0175c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "thor-devkit",
-  "version": "0.2.5",
+  "version": "0.2.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 7e348f9..1da0794 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "thor-devkit",
-  "version": "0.2.5",
+  "version": "0.2.6",
   "description": "Typescript library to aid DApp development on VeChain Thor",
   "main": "dist/index.js",
   "typings": "dist/index.d.ts",
diff --git a/src/lib/crypto.ts b/src/lib/crypto.ts
index 0c9a8e3..3c53a71 100644
--- a/src/lib/crypto.ts
+++ b/src/lib/crypto.ts
@@ -43,11 +43,11 @@ export function publicKeyToAddress(pubKey: Buffer) {
 }
 
 /**
- * validate the address
- * @param address the address
+ * to check if a value presents an address
+ * @param v the value to be checked
  */
-export function isValidAddress(address: string) {
-    return /^0x[0-9a-f]{40}$/i.test(address)
+export function isAddress(v: any): v is string {
+    return typeof v === 'string' && /^0x[0-9a-f]{40}$/i.test(v)
 }
 
 /**
@@ -55,7 +55,7 @@ export function isValidAddress(address: string) {
  * @param address input address
  */
 export function toChecksumAddress(address: string) {
-    if (!isValidAddress(address)) {
+    if (!isAddress(address)) {
         throw new Error('invalid address')
     }
     address = address.slice(2).toLowerCase()
diff --git a/tests/crypto.test.ts b/tests/crypto.test.ts
index 326cf92..f1912be 100644
--- a/tests/crypto.test.ts
+++ b/tests/crypto.test.ts
@@ -22,9 +22,9 @@ describe('hash', () => {
 
 describe('isValidAddress', () => {
     it('validate address', () => {
-        expect(cry.isValidAddress('not an address')).equal(false)
-        expect(cry.isValidAddress('52908400098527886E0F7030069857D2E4169EE7')).equal(false)
-        expect(cry.isValidAddress('0x52908400098527886E0F7030069857D2E4169EE7')).equal(true)
+        expect(cry.isAddress('not an address')).equal(false)
+        expect(cry.isAddress('52908400098527886E0F7030069857D2E4169EE7')).equal(false)
+        expect(cry.isAddress('0x52908400098527886E0F7030069857D2E4169EE7')).equal(true)
     })
 })