diff --git a/Cargo.lock b/Cargo.lock
index fbc2a20..1478f7b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -912,8 +912,8 @@ version = "0.1.0"
 dependencies = [
  "lox",
  "serde",
+ "serde_json",
  "serde_with",
- "zkp",
 ]
 
 [[package]]
diff --git a/crates/lox-utils/Cargo.toml b/crates/lox-utils/Cargo.toml
index 1ca76cf..a286bed 100644
--- a/crates/lox-utils/Cargo.toml
+++ b/crates/lox-utils/Cargo.toml
@@ -14,8 +14,8 @@ repository = "https://gitlab.torproject.org/tpo/anti-censorship/lox.git/"
 [dependencies]
 lox = {path = "../lox-library", version = "0.1.0"}
 serde = "1"
+serde_json = "1.0.96"
 serde_with = "3.0.0"
-zkp = "0.8.0"
 
 
 [features]
diff --git a/crates/lox-utils/src/lib.rs b/crates/lox-utils/src/lib.rs
index 5d518e3..acfa7b3 100644
--- a/crates/lox-utils/src/lib.rs
+++ b/crates/lox-utils/src/lib.rs
@@ -1,5 +1,5 @@
-use lox::bridge_table::{BridgeLine, ENC_BUCKET_BYTES};
-use lox::cred::{Invitation, Lox};
+use lox::bridge_table::{from_scalar, BridgeLine, BridgeTable, ENC_BUCKET_BYTES};
+use lox::cred::{BucketReachability, Invitation, Lox};
 use lox::proto;
 use lox::{IssuerPubKey, OPENINV_LENGTH};
 use serde::{Deserialize, Serialize};
@@ -81,3 +81,22 @@ pub struct LoxCredential {
 pub fn validate(invite: &[u8]) -> Result<[u8; OPENINV_LENGTH], TryFromSliceError> {
     invite.try_into()
 }
+
+pub fn generate_reachability_cred(lox_cred: &Lox, encrypted_table: String) -> BucketReachability {
+    let (id, key) = from_scalar(lox_cred.bucket).unwrap();
+    let enc_buckets: EncBridgeTable = serde_json::from_str(&encrypted_table).unwrap();
+    let bucket = BridgeTable::decrypt_bucket(id, &key, &enc_buckets.etable[id as usize]).unwrap();
+    bucket.1.unwrap()
+}
+
+//pub const MAX_LEVEL: usize = 4;
+//pub const LEVEL_INTERVAL: [u32; MAX_LEVEL + 1] = [0, 14, 28, 56, 84];
+pub fn calc_test_days(trust_level: i64) -> i64 {
+    let mut total = 31;
+    // for level in 0..trust_level {
+    //      let level_interval: u32 = LEVEL_INTERVAL[trust_level as usize];
+    //     total += level_interval;
+    total += trust_level * 85;
+    //  }
+    total
+}
diff --git a/crates/lox-wasm/src/lib.rs b/crates/lox-wasm/src/lib.rs
index 5958665..42d4845 100644
--- a/crates/lox-wasm/src/lib.rs
+++ b/crates/lox-wasm/src/lib.rs
@@ -1,7 +1,6 @@
 use chrono::{Duration, Utc};
 use julianday::JulianDay;
-use lox::bridge_table::{from_scalar, BridgeTable};
-use lox::cred::{BucketReachability, Invitation, Lox, Migration};
+use lox::cred::{Invitation, Lox, Migration};
 use lox::proto::{
     blockage_migration, check_blockage, issue_invite, level_up, migration, open_invite,
     redeem_invite, trust_promotion,
@@ -9,7 +8,6 @@ use lox::proto::{
 use lox::scalar_u32;
 use std::panic;
 use wasm_bindgen::prelude::*;
-use zkp::ProofError;
 
 fn today() -> u32 {
     let naive_now = Utc::now().date_naive();
@@ -22,12 +20,10 @@ fn test_today(days: i64) -> u32 {
     JulianDay::from(naive_now_plus).inner().try_into().unwrap()
 }
 
-//pub const MAX_LEVEL: usize = 4;
-//pub const LEVEL_INTERVAL: [u32; MAX_LEVEL + 1] = [0, 14, 28, 56, 84];
-fn calc_test_days(lox_cred: &Lox) -> Result<i64, ProofError> {
+fn calc_test_days(lox_cred: &Lox) -> Result<i64, String> {
     let trust_level: i64 = match scalar_u32(&lox_cred.trust_level) {
         Some(v) => v as i64,
-        None => return Err(ProofError::VerificationFailure),
+        None => return Err("Error: Trust level does not exist".to_string()),
     };
     let mut total = 31;
     // for level in 0..trust_level {
@@ -233,13 +229,6 @@ pub fn handle_trust_migration(
     Ok(serde_json::to_string(&level_one_cred).unwrap())
 }
 
-fn generate_reachability_cred(lox_cred: &Lox, encrypted_table: String) -> BucketReachability {
-    let (id, key) = from_scalar(lox_cred.bucket).unwrap();
-    let enc_buckets: lox_utils::EncBridgeTable = serde_json::from_str(&encrypted_table).unwrap();
-    let bucket = BridgeTable::decrypt_bucket(id, &key, &enc_buckets.etable[id as usize]).unwrap();
-    bucket.1.unwrap()
-}
-
 #[wasm_bindgen]
 pub fn level_up(
     level_one_cred: String,
@@ -248,7 +237,8 @@ pub fn level_up(
 ) -> Result<String, JsValue> {
     let lox_cred: lox_utils::LoxCredential = serde_json::from_str(&level_one_cred).unwrap();
     let pubkeys: lox_utils::PubKeys = serde_json::from_str(&lox_pub).unwrap();
-    let reach_cred = generate_reachability_cred(&lox_cred.lox_credential, encrypted_table);
+    let reach_cred =
+        lox_utils::generate_reachability_cred(&lox_cred.lox_credential, encrypted_table);
 
     // To test level up of the credential we need to advance the day to the correct interval
     // In this case, the maximum of 85 can be used to test all level ups
@@ -258,8 +248,8 @@ pub fn level_up(
     let test_cumulative_days = match calc_test_days(&lox_cred.lox_credential) {
         Ok(v) => v,
         Err(e) => {
-            log(&format!("Error: {:?}", e.to_string()));
-            return Err(JsValue::from(e.to_string()));
+            log(&format!("Error: {:?}", e));
+            return Err(JsValue::from(e));
         }
     };
 
@@ -331,7 +321,8 @@ pub fn issue_invite(
 ) -> Result<String, JsValue> {
     let lox_cred: lox_utils::LoxCredential = serde_json::from_str(&trusted_cred).unwrap();
     let pubkeys: lox_utils::PubKeys = serde_json::from_str(&lox_pub).unwrap();
-    let reach_cred = generate_reachability_cred(&lox_cred.lox_credential, encrypted_table);
+    let reach_cred =
+        lox_utils::generate_reachability_cred(&lox_cred.lox_credential, encrypted_table);
 
     let issue_result = match issue_invite::request(
         &lox_cred.lox_credential,