diff --git a/packages/sdk/src/api/entities/VCLFinalizeOffersDescriptor.ts b/packages/sdk/src/api/entities/VCLFinalizeOffersDescriptor.ts
index 1b0561f..61345ba 100644
--- a/packages/sdk/src/api/entities/VCLFinalizeOffersDescriptor.ts
+++ b/packages/sdk/src/api/entities/VCLFinalizeOffersDescriptor.ts
@@ -43,7 +43,7 @@ export default class VCLFinalizeOffersDescriptor {
         const proofJson: any = {};
         if (proof) {
             proofJson[VCLFinalizeOffersDescriptor.KeyProofType] = VCLFinalizeOffersDescriptor.KeyJwt;
-            proofJson[VCLFinalizeOffersDescriptor.KeyJwt] = proof.signedJwt.serialize();
+            proofJson[VCLFinalizeOffersDescriptor.KeyJwt] = proof.encodedJwt;
             retVal[VCLFinalizeOffersDescriptor.KeyProof] = proofJson
         }
         return retVal;
diff --git a/packages/sdk/src/api/entities/VCLJwt.ts b/packages/sdk/src/api/entities/VCLJwt.ts
index 34a1f03..87085bd 100644
--- a/packages/sdk/src/api/entities/VCLJwt.ts
+++ b/packages/sdk/src/api/entities/VCLJwt.ts
@@ -31,7 +31,7 @@ export default class VCLJwt {
     }
 
     get jwk(): Dictionary<any> {
-        return this.header.jwk || JSON.parse("{}")
+        return this.header.jwk || {}
     }
 
     get header(): Dictionary<any> {
diff --git a/packages/sdk/test/entities/VCLJwt.test.ts b/packages/sdk/test/entities/VCLJwt.test.ts
index 3bf3065..a5d8681 100644
--- a/packages/sdk/test/entities/VCLJwt.test.ts
+++ b/packages/sdk/test/entities/VCLJwt.test.ts
@@ -1,7 +1,6 @@
 import VCLJwt from "../../src/api/entities/VCLJwt";
 import "../../src/impl/extensions/StringExtensions";
 
-let subject: VCLJwt
 const jwtWtithKidStr =
 "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6InNvbWVfa2lkIn0.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.lGqyFj2RpmostxLvCcMFym9kWM0bzQcty9a81EdzrhM"
 const jwtWtihJwkStr =
@@ -10,37 +9,38 @@ const jwtWtihJwkStr =
 describe("test jwt", () => {
 
     test("empty jwt", async () => {
-        subject = VCLJwt.fromEncodedJwt("")
-
-        expect(JSON.stringify(subject.header) == "{}").toBeTruthy()
-        expect(JSON.stringify(subject.payload) == "{}").toBeTruthy()
-        expect(subject.signature == "").toBeTruthy()
-        expect(subject.encodedJwt == "").toBeTruthy()
-        expect(JSON.stringify(subject.jwk) == "{}").toBeTruthy()
-        expect(subject.kid == "").toBeTruthy()
+        const subject = VCLJwt.fromEncodedJwt("")
+
+        expect(subject.header).toStrictEqual({})
+        expect(subject.payload).toStrictEqual({})
+        expect(subject.signature).toStrictEqual("")
+        expect(subject.encodedJwt).toStrictEqual("")
+        expect(subject.jwk).toStrictEqual({})
+        expect(subject.kid).toStrictEqual("")
     })
 
     test("valid jwt with kid", async () => {
-        subject = VCLJwt.fromEncodedJwt(jwtWtithKidStr)
-
-        expect(JSON.stringify(subject.header) == "{\"alg\":\"HS256\",\"typ\":\"JWT\",\"kid\":\"some_kid\"}").toBeTruthy()
-        expect(JSON.stringify(subject.payload) == "{\"sub\":\"1234567890\",\"name\":\"John Doe\",\"iat\":1516239022}").toBeTruthy()
-        expect(subject.signature == "lGqyFj2RpmostxLvCcMFym9kWM0bzQcty9a81EdzrhM").toBeTruthy()
-        expect(subject.encodedJwt == jwtWtithKidStr).toBeTruthy()
-        expect(JSON.stringify(subject.jwk) == "{}").toBeTruthy()
-        expect(subject.kid == "some_kid").toBeTruthy()
+        const subject = VCLJwt.fromEncodedJwt(jwtWtithKidStr)
+
+        expect(subject.header).toStrictEqual(JSON.parse("{\"alg\":\"HS256\",\"typ\":\"JWT\",\"kid\":\"some_kid\"}"))
+        expect(subject.payload).toStrictEqual(JSON.parse("{\"sub\":\"1234567890\",\"name\":\"John Doe\",\"iat\":1516239022}"))
+        expect(subject.signature).toStrictEqual("lGqyFj2RpmostxLvCcMFym9kWM0bzQcty9a81EdzrhM")
+        expect(subject.encodedJwt).toStrictEqual(jwtWtithKidStr)
+        expect(subject.jwk).toStrictEqual({})
+        expect(subject.kid).toStrictEqual("some_kid")
     })
 
     test("valid jwt with jwk", async () => {
-        subject = VCLJwt.fromEncodedJwt(jwtWtihJwkStr)
+        const subject = VCLJwt.fromEncodedJwt(jwtWtihJwkStr)
 
-        expect(JSON.stringify(subject.header) ==
+        expect(subject.header).toStrictEqual(
+            JSON.parse(
             "{\"alg\":\"HS256\",\"typ\":\"JWT\",\"jwk\":{\"kty\":\"RSA\",\"use\":\"sig\",\"kid\":\"some_kid\",\"n\":\"zg7-8aYrxuV7H4t...\",\"e\":\"AQAB\"}}"
-        ).toBeTruthy()
-        expect(JSON.stringify(subject.payload) == "{\"sub\":\"1234567890\",\"name\":\"John Doe\",\"iat\":1516239022}").toBeTruthy()
-        expect(subject.signature == "ijeuQTlhK7jpYkRmD_yWFKtluFWLEhjdieZJxkTc9fY").toBeTruthy()
-        expect(subject.encodedJwt == jwtWtihJwkStr).toBeTruthy()
-        expect(JSON.stringify(subject.jwk) == "{\"kty\":\"RSA\",\"use\":\"sig\",\"kid\":\"some_kid\",\"n\":\"zg7-8aYrxuV7H4t...\",\"e\":\"AQAB\"}").toBeTruthy()
-        expect(subject.kid == "some_kid").toBeTruthy()
+        ))
+        expect(subject.payload).toStrictEqual(JSON.parse("{\"sub\":\"1234567890\",\"name\":\"John Doe\",\"iat\":1516239022}"))
+        expect(subject.signature).toStrictEqual("ijeuQTlhK7jpYkRmD_yWFKtluFWLEhjdieZJxkTc9fY")
+        expect(subject.encodedJwt).toStrictEqual(jwtWtihJwkStr)
+        expect(subject.jwk).toStrictEqual(JSON.parse("{\"kty\":\"RSA\",\"use\":\"sig\",\"kid\":\"some_kid\",\"n\":\"zg7-8aYrxuV7H4t...\",\"e\":\"AQAB\"}"))
+        expect(subject.kid).toStrictEqual("some_kid")
     })
 })