diff --git a/BE/issuer/src/issuer/issuer-api.service.ts b/BE/issuer/src/issuer/issuer-api.service.ts
index af13b90..03da490 100644
--- a/BE/issuer/src/issuer/issuer-api.service.ts
+++ b/BE/issuer/src/issuer/issuer-api.service.ts
@@ -88,7 +88,7 @@ export class IssuerAPIService {
     @ Intend: Issuer Pub Key를 반환
   */
   getIssuerPubKey() {
-    return 'meaty-man.testnet';
+    return 'honorable-muscle.testnet';
   }
 
   /*
diff --git a/BE/issuer/src/utils/utils.ts b/BE/issuer/src/utils/utils.ts
index 75039f9..3612235 100644
--- a/BE/issuer/src/utils/utils.ts
+++ b/BE/issuer/src/utils/utils.ts
@@ -25,7 +25,7 @@ export async function connectToNEARContract(): Promise<Contract> {
   // issuer
   const account = await nearConnection.account('shaggy-trade.testnet');
 
-  const contract = new Contract(account, 'meaty-man.testnet', {
+  const contract = new Contract(account, 'honorable-muscle.testnet', {
     viewMethods: [
       'get_document',
       'get_did_list',
diff --git a/BE/issuer/test/api.test.spec.ts b/BE/issuer/test/api.test.spec.ts
index 1097c25..309f566 100644
--- a/BE/issuer/test/api.test.spec.ts
+++ b/BE/issuer/test/api.test.spec.ts
@@ -69,6 +69,9 @@ describe('IssuerAPIController (e2e)', () => {
     expect(res).toHaveProperty('vc');
   });
 
+  // TODO
+  // - issuerPubKey 와 vc{ ... }의 `issuer` 를 통일해야함
+  // - `pnu.testnet` 에는 최종 완성된 스마트 컨트랙트를 배포할 예정임
   it('Load Key Chain: Success', async () => {
     const issuerPubKey = 'meaty-man.testnet';
     const vc = `{
diff --git a/BE/verifier/src/utils/utils.ts b/BE/verifier/src/utils/utils.ts
index 9294627..86bd8db 100644
--- a/BE/verifier/src/utils/utils.ts
+++ b/BE/verifier/src/utils/utils.ts
@@ -24,7 +24,7 @@ export async function connectToNEARContract(): Promise<Contract> {
   const nearConnection = await connect(connectionConfig);
   const account = await nearConnection.account('shaggy-trade.testnet');
 
-  const contract = new Contract(account, 'meaty-man.testnet', {
+  const contract = new Contract(account, 'honorable-muscle.testnet', {
     viewMethods: [
       'get_document',
       'get_did_list',
diff --git a/SC/readme.md b/SC/readme.md
index 8271c4c..424bb38 100644
--- a/SC/readme.md
+++ b/SC/readme.md
@@ -34,6 +34,17 @@ did:near:<named_account>
 - `issuer` 를 등록합니다.
 - `service`를 등록합니다.
 
+### 예시
+```bash
+export CTRT="hello-world.testnet"
+near call $CTRT reg_did_using_account --useAccount $CTRT '{"is_issuer": true}' --deposit 5
+near call $CTRT reg_service_name '{"service_name": "kataomoi-boat"}' --useAccount $CTRT
+near view $CTRT get_total_registered_services
+# [ 'kataomoi-boat' ]
+near call $CTRT load_verify_result '{"service_name":"kataomoi-boat", "holder_did": "hpubkey"}' --useAccount $CTRT
+near view $CTRT get_servicename_values '{"service_name":"kataomoi-boat"}'
+```
+
 ## 구성
 - Smart contract 는 아래와 같이 총 6개의 state를 저장하고 있습니다.
 
diff --git a/SC/src/lib.rs b/SC/src/lib.rs
index 13a772a..ecf3adb 100644
--- a/SC/src/lib.rs
+++ b/SC/src/lib.rs
@@ -28,7 +28,7 @@ struct DidContract {
     // Set: Issuer DID
     pub set_issuer_did: UnorderedSet<IssuerDID>,
 
-    // Set: Issuer DID
+    // Set: Service Name
     pub set_service_name: UnorderedSet<ServiceName>,
 
     // Mapping: Issuer DID --> Vec<HashedVc>
diff --git a/SC/src/utils.rs b/SC/src/utils.rs
index 8e946f6..c4be692 100644
--- a/SC/src/utils.rs
+++ b/SC/src/utils.rs
@@ -3,6 +3,7 @@ use crate::DidContractExt;
 use crate::DidDocument;
 use crate::HolderDID;
 use crate::IssuerDID;
+use crate::ServiceName;
 use crate::DID;
 
 use near_sdk::AccountId;
@@ -32,6 +33,11 @@ impl DidContract {
         self.map_holder_did_to_issuer_did.get(&holder_did).unwrap()
     }
 
+    // for service
+    pub fn get_total_registered_services(&self) -> Vec<ServiceName> {
+        self.set_service_name.iter().collect()
+    }
+
     pub fn get_mapped_holder_did_validity(
         &self,
         holder_did: HolderDID,
diff --git a/SC/src/zkp_verify.rs b/SC/src/zkp_verify.rs
index 0b07855..9f93c96 100644
--- a/SC/src/zkp_verify.rs
+++ b/SC/src/zkp_verify.rs
@@ -11,11 +11,18 @@ impl DidContract {
         service_name: String,
         holder_did: HolderDID,
     ) {
+        if self.set_service_name.contains(&service_name) == false {
+            env::panic_str(
+                "Not a registered service, should be registered first",
+            );
+        }
+
         match self.map_servicename_to_holder_validity.get(&service_name) {
             // 이전에 등록된 Service 인 경우
             Some(mut l) => match l.contains(&holder_did) {
                 true => {
                     // 이미 인증된 사용자
+                    env::panic_str("Already registered user")
                 }
                 false => {
                     // 새로 인증한 사용자
@@ -23,10 +30,13 @@ impl DidContract {
                 }
             },
             None => {
-                // 등록되지 않은 서비스
-                env::panic_str(
-                    "Not a registered service, should be registered first",
-                );
+                // 처음으로 사용자를 등록하는 서비스
+                let mut new_hash_set = HashSet::new();
+
+                new_hash_set.insert(holder_did);
+
+                self.map_servicename_to_holder_validity
+                    .insert(&service_name, &new_hash_set);
             }
         };
     }
@@ -43,4 +53,17 @@ impl DidContract {
 
         list_of_valid_holders.contains(&holder_did)
     }
+
+    // check
+    pub fn get_servicename_values(&self, service_name: String) -> Vec<String> {
+        let list_of_valid_holders = self
+            .map_servicename_to_holder_validity
+            .get(&service_name)
+            .expect("No holders had been registered");
+
+        list_of_valid_holders
+            .iter()
+            .map(|v| v.to_string())
+            .collect()
+    }
 }