diff --git a/backend/src/identity/utils.ts b/backend/src/identity/utils.ts
index a562071..de537b7 100644
--- a/backend/src/identity/utils.ts
+++ b/backend/src/identity/utils.ts
@@ -15,6 +15,8 @@ export interface DataSigningRequest {
   data: Uint8Array;
   /** Signing key's ID. */
   keyId: string;
+  /** Key type of the key with id `key_id`. Valid values are: Ed25519, ES256, ES256K. */
+  keyType: string;
 }
 
 export interface DataSigningResponse {
diff --git a/oid4vc/TangleLabs/src/remoteSigner.ts b/oid4vc/TangleLabs/src/remoteSigner.ts
index 5626a6d..bfc0e06 100644
--- a/oid4vc/TangleLabs/src/remoteSigner.ts
+++ b/oid4vc/TangleLabs/src/remoteSigner.ts
@@ -4,6 +4,7 @@ import { dirname } from 'path';
 import * as grpc from "@grpc/grpc-js";
 import { loadSync } from "@grpc/proto-loader";
 import { Signer } from 'did-jwt';
+import { KeyType } from "@sphereon/did-resolver-jwk";
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
@@ -28,6 +29,7 @@ export const remoteSigner: (keyId: string) => Signer = (keyId) => async (data) =
   
     const response = await new Promise((resolve, reject) => identityClient.sign({
       keyId,
+      keyType: "ES256",
       data: Uint8Array.from(Buffer.from(data)),
     }, (err, response) => {
       if (err) {
diff --git a/shared/proto/identity/utils.proto b/shared/proto/identity/utils.proto
index 80f0692..25b83df 100644
--- a/shared/proto/identity/utils.proto
+++ b/shared/proto/identity/utils.proto
@@ -9,6 +9,8 @@ message DataSigningRequest {
     bytes data = 1;
     // Signing key's ID.
     string key_id = 2;
+    // Key type of the key with id `key_id`. Valid values are: Ed25519, ES256, ES256K.
+    string key_type = 3;
 }
 
 message DataSigningResponse {
diff --git a/tooling/API/Identity/GRPC.http b/tooling/API/Identity/GRPC.http
index b6dad2f..aad849c 100644
--- a/tooling/API/Identity/GRPC.http
+++ b/tooling/API/Identity/GRPC.http
@@ -53,7 +53,8 @@ GRPC /Jwt/create
 GRPC /Signing/sign
 {
     "data": {{data}},
-    "keyId": "pK0JAYw5RFFKqorBn0x4w98zl2UBfRys"
+    "keyId": "UUMXMjmLiKKUChyHGRjiEdSVTSUDSMTD",
+    "keyType": "ES256"
 }
 ###
 
@@ -123,7 +124,7 @@ GRPC /CredentialPresentation/validate
 ###
 GRPC /CredentialPresentation/validate
 {
-    "jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJFZERTQSIsImtpZCI6ImRpZDpqd2s6ZXlKaGJHY2lPaUpGWkVSVFFTSXNJbU55ZGlJNklrVmtNalUxTVRraUxDSnJhV1FpT2lKeWNIcEZNVWhyVW1aaVpYUldaRmQ1WW1wRFRFRkpMVlJxY2pWclRsVmpNRk5GZVdsaWVFRlNUamxySWl3aWEzUjVJam9pVDB0UUlpd2llQ0k2SW5wSGRGTnVWWHBwZFdoWFZWTjJNVGhqUVZWemRrNWlVWGR4WjBsNWQyaE9ZMnBVUW5oblNITnpTVWtpZlEjMCJ9.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.lQhVLvQ7eeoAHrwQ6MIitU6x4wEv7EqnxI0Jd30xrqZ0wZAQ-JmpZ6fag9g8SKHx3x3RMEKBrgqvpMVhDPcmDQ"
+    "jwt": "eyJraWQiOiJkaWQ6aW90YTpybXM6MHhkYjJhMmIzOTk0YzdhNzliNzliYWRiZDBjYjVkNDVlN2U4N2NiYTEwZWM1Mjk3MGE5MzY1NmM2YjA3MDBiOTk2I09zd2JJTlJNMHFLRExoRHYwdHVGbEtGbUh2UmNaOE9pLXBsNUdzTks2RTAiLCJ0eXAiOiJKV1QiLCJhbGciOiJFZERTQSJ9.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.2U2G5oggjuelj9Zdhh3CiNwwe5kOvV9jr317QvgUKqRQwwlsCtBVrTEzU4aS7VnLidf65HUnHG7srpMjPldACA"
 }
 ###