diff --git a/README.md b/README.md
index ba649e3..8c5163f 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# ✍️⚔️ Nanopub cross-platform toolkit
+# ✍️ Nanopub cross-platform toolkit ⚔️
 
 [![Build](https://github.com/vemonet/nanopub-rs/actions/workflows/build.yml/badge.svg)](https://github.com/vemonet/nanopub-rs/actions/workflows/build.yml) [![Lint and Test](https://github.com/vemonet/nanopub-rs/actions/workflows/test.yml/badge.svg)](https://github.com/vemonet/nanopub-rs/actions/workflows/test.yml) [![codecov](https://codecov.io/gh/vemonet/nanopub-rs/graph/badge.svg?token=BF15PSO6GN)](https://codecov.io/gh/vemonet/nanopub-rs)
 
diff --git a/js/src/utils.rs b/js/src/utils.rs
index a362c31..d88fe37 100644
--- a/js/src/utils.rs
+++ b/js/src/utils.rs
@@ -1,5 +1,5 @@
-use js_sys::Error;
-use wasm_bindgen::JsValue;
+// use js_sys::Error;
+// use wasm_bindgen::JsValue;
 
 #[macro_export]
 macro_rules! format_err {
@@ -11,6 +11,6 @@ macro_rules! format_err {
     };
 }
 
-pub fn to_err(e: impl ToString) -> JsValue {
-    JsValue::from(Error::new(&e.to_string()))
-}
+// pub fn to_err(e: impl ToString) -> JsValue {
+//     JsValue::from(Error::new(&e.to_string()))
+// }
diff --git a/lib/src/error.rs b/lib/src/error.rs
index f8d2bc1..b140a88 100644
--- a/lib/src/error.rs
+++ b/lib/src/error.rs
@@ -77,6 +77,11 @@ impl From<rsa::Error> for NpError {
         NpError(format!("RSA signing error: {err}"))
     }
 }
+impl From<rsa::pkcs8::Error> for NpError {
+    fn from(err: rsa::pkcs8::Error) -> Self {
+        NpError(format!("Invalid RSA public key error: {err}"))
+    }
+}
 impl From<rsa::pkcs8::spki::Error> for NpError {
     fn from(err: rsa::pkcs8::spki::Error) -> Self {
         NpError(format!("Invalid RSA public key error: {err}"))
diff --git a/lib/src/nanopub.rs b/lib/src/nanopub.rs
index 867c9e1..2f38579 100644
--- a/lib/src/nanopub.rs
+++ b/lib/src/nanopub.rs
@@ -7,12 +7,11 @@ use crate::utils::{get_ns, parse_rdf, serialize_rdf};
 
 use base64;
 use base64::{engine, Engine as _};
-use chrono::Utc;
 use regex::Regex;
 use rsa::pkcs8::DecodePublicKey;
 use rsa::{sha2::Digest, sha2::Sha256, Pkcs1v15Sign, RsaPublicKey};
 use sophia::api::dataset::{Dataset, MutableDataset};
-use sophia::api::ns::{rdf, xsd, Namespace};
+use sophia::api::ns::{rdf, Namespace};
 use sophia::api::quad::Quad;
 use sophia::api::term::{matcher::Any, Term};
 use sophia::inmem::dataset::LightDataset;
@@ -244,7 +243,7 @@ impl Nanopub {
     pub fn sign(rdf: &str, profile: &NpProfile) -> Result<Self, NpError> {
         openssl_probe::init_ssl_cert_env_vars();
 
-        let (priv_key, pubkey) = get_keys(&profile.private_key);
+        let (priv_key, pubkey) = get_keys(&profile.private_key)?;
         let pubkey_str = get_pubkey_str(&pubkey);
 
         // Parse the provided RDF
diff --git a/lib/src/profile.rs b/lib/src/profile.rs
index 1a74dab..c0564d2 100644
--- a/lib/src/profile.rs
+++ b/lib/src/profile.rs
@@ -4,7 +4,7 @@ use serde::{Deserialize, Serialize};
 use serde_yaml;
 use std::io::Read;
 use std::{env, fs};
-use std::{error::Error, fmt};
+use std::fmt;
 
 use crate::constants::DEFAULT_NP_PROFILE;
 use crate::constants::{BOLD, END};
@@ -26,7 +26,7 @@ impl NpProfile {
         private_key: &str,
         introduction_nanopub_uri: Option<&str>,
     ) -> Result<Self, NpError> {
-        let (_priv_key, pubkey) = get_keys(private_key);
+        let (_priv_key, pubkey) = get_keys(private_key)?;
         Ok(Self {
             orcid_id: orcid_id.to_string(),
             name: name.to_string(),
@@ -77,15 +77,13 @@ impl fmt::Display for NpProfile {
 }
 
 /// Get `RsaPrivateKey` and `RsaPublicKey` given a private key string
-pub fn get_keys(private_key: &str) -> (RsaPrivateKey, RsaPublicKey) {
+pub fn get_keys(private_key: &str) -> Result<(RsaPrivateKey, RsaPublicKey), NpError> {
     let priv_key_bytes = engine::general_purpose::STANDARD
-        .decode(private_key)
-        .expect("Error decoding private key");
+        .decode(private_key)?;
     let priv_key =
-        RsaPrivateKey::from_pkcs8_der(&priv_key_bytes).expect("Failed to parse RSA private key");
-
+        RsaPrivateKey::from_pkcs8_der(&priv_key_bytes)?;
     let public_key = RsaPublicKey::from(&priv_key);
-    (priv_key, public_key)
+    Ok((priv_key, public_key))
 }
 
 /// Get a public key string for a `RsaPublicKey`
diff --git a/lib/src/publish.rs b/lib/src/publish.rs
index 2b139d9..66167b0 100644
--- a/lib/src/publish.rs
+++ b/lib/src/publish.rs
@@ -1,5 +1,3 @@
-// use crate::error::NpError;
-use std::error::Error;
 #[cfg(target_arch = "wasm32")]
 use wasm_bindgen::prelude::*;
 #[cfg(target_arch = "wasm32")]
diff --git a/lib/tests/nanopub_test.rs b/lib/tests/nanopub_test.rs
index 26c3087..4eaea18 100644
--- a/lib/tests/nanopub_test.rs
+++ b/lib/tests/nanopub_test.rs
@@ -8,7 +8,6 @@ fn get_test_key() -> String {
 #[test]
 fn publish_nanopub_simple_rsa() -> Result<(), Box<dyn Error>> {
     let np_rdf = fs::read_to_string("./tests/resources/simple1-rsa.trig")?;
-
     let profile = NpProfile::new("", "", &get_test_key(), None)?;
     let np = Nanopub::publish(&np_rdf, &profile, None)?;
     // println!("{}", np);
@@ -41,6 +40,23 @@ fn sign_nanopub_test_blank() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
+#[test]
+fn publish_fail() -> Result<(), Box<dyn Error>> {
+    let np_rdf = fs::read_to_string("./tests/resources/simple1-rsa.trig")?;
+    let profile = NpProfile::new("", "", &get_test_key(), None)?;
+    let np = Nanopub::publish(&np_rdf, &profile, Some("failing"))?;
+    assert!(!np.published);
+    Ok(())
+}
+
+#[test]
+fn profile_fail() -> Result<(), Box<dyn Error>> {
+    let profile = NpProfile::new("", "", "failing", None);
+    assert!(profile.is_err());
+    Ok(())
+}
+
+
 #[test]
 fn check_nanopub_test_blank() -> Result<(), Box<dyn Error>> {
     let np_rdf = fs::read_to_string("./tests/resources/signed.nanopub_test_blank.trig")?;