diff --git a/src/services/index.js b/src/services/index.js
index 2c0d0ce..454dc5a 100644
--- a/src/services/index.js
+++ b/src/services/index.js
@@ -1,3 +1,5 @@
+const constants = require('../constants');
+
 class ServicesProvider {
   constructor() {}
 
@@ -9,7 +11,9 @@ class ServicesProvider {
     */
 
     const NostrServiceProvider = require('../services/nostrService');
-    const nostrService = new NostrServiceProvider().provide();
+    const nostrService = new NostrServiceProvider({
+      constants: constants,
+    }).provide();
     const InvitesServiceProvider = require('../services/invitesService');
     const invitesService = new InvitesServiceProvider({
       nostrService,
diff --git a/src/services/nostrService.js b/src/services/nostrService.js
index 46573be..5239273 100644
--- a/src/services/nostrService.js
+++ b/src/services/nostrService.js
@@ -5,19 +5,20 @@ const { verifyEvent } = require('nostr-tools');
 
 const models = require('../models');
 
-const constants = require('../constants');
 const errors = require('../errors');
 
 class NostrServiceProvider {
-  constructor() {}
+  constructor({ constants }) {
+    this.constants = constants;
+  }
 
   provide() {
-    async function createNostrChallenge() {
+    const createNostrChallenge = async () => {
       const currentTimestamp = new Date();
       const expiryTimestamp = new Date(currentTimestamp.getTime());
       expiryTimestamp.setSeconds(
         expiryTimestamp.getSeconds() +
-          constants.DEFAULT_NOSTR_CHALLENGE_DURATION_SECONDS
+          this.constants.DEFAULT_NOSTR_CHALLENGE_DURATION_SECONDS
       );
 
       const nostrChallenge = await models.NostrChallengeCreated.create({
@@ -28,7 +29,7 @@ class NostrServiceProvider {
       });
 
       return nostrChallenge;
-    }
+    };
 
     async function getNostrChallenge(
       nostrChallengeUuid = null,