diff --git a/src/sign/Cargo.toml b/src/sign/Cargo.toml
index e8db56ab10..b8c4c40c72 100644
--- a/src/sign/Cargo.toml
+++ b/src/sign/Cargo.toml
@@ -35,6 +35,6 @@ serde_json = "1.0"
 serde_yaml = "0.8.17"
 rand = "0.8.3"
 bech32 = "0.8"
-rand_core = { version = "0.5.1", default-features = false }
+rand_core = { version = "0.5.1", default-features = false, features = ["getrandom"] }
 ed25519-dalek = "1.0.1"
 reqwest = { version = "*", default_features = false, features = [ "blocking","json", "rustls-tls" ] }
diff --git a/src/sign/src/main.rs b/src/sign/src/main.rs
index 60e6c789f2..27da8081cd 100644
--- a/src/sign/src/main.rs
+++ b/src/sign/src/main.rs
@@ -10,11 +10,7 @@ use clap::Parser;
 use color_eyre::Result;
 use rand::SeedableRng;
 use rand_chacha::ChaCha20Rng;
-use catalyst_voting::{
-     crypto::{ed25519::PrivateKey},
-     txs::v1::Tx,
-     vote_protocol::committee::ElectionSecretKey,
-};
+use std::convert::TryInto;
 
 use ed25519_dalek::*;
 use std::error::Error;
@@ -24,10 +20,9 @@ use crate::fragment::{compose_encrypted_vote_part, generate_vote_fragment};
 pub mod fragment;
 pub mod network;
 
-
 ///
 /// Args defines and declares CLI behaviour within the context of clap
-/// 
+///
 #[derive(Parser, Debug, Clone)]
 #[clap(about, version, author)]
 pub enum Cli {
@@ -65,21 +60,22 @@ pub struct CliArgs {
     choice: u8,
 }
 
-
 fn main() -> Result<(), Box<dyn Error>> {
     color_eyre::install()?;
 
     let cli = Cli::parse();
 
+    let mut rng = ChaCha20Rng::from_entropy();
     match cli {
-        Cli::V1(args) => v1_exec(args),
-        Cli::V2(args) => v2_exec(args),
+        Cli::V1(args) => v1_exec(args, &mut rng),
+        Cli::V2(args) => v2_exec(args, &mut rng),
     }
 }
 
-fn v1_exec(args: CliArgs) -> Result<(), Box<dyn Error>>  {
-    let mut rng = ChaCha20Rng::from_seed([0u8; 32]);
+/// Number of voting options
+const VOTING_OPTIONS: u8 = 2;
 
+fn v1_exec(args: CliArgs, rng: &mut ChaCha20Rng) -> Result<(), Box<dyn Error>> {
     let pk = hex::decode(args.public_key)?;
     let mut sk = hex::decode(args.private_key)?;
 
@@ -96,7 +92,7 @@ fn v1_exec(args: CliArgs) -> Result<(), Box<dyn Error>>  {
 
     let choice = args.choice;
 
-    let vote = chain_vote::Vote::new(2, choice.into())?;
+    let vote = chain_vote::Vote::new(VOTING_OPTIONS.into(), choice.into())?;
     // common reference string
     let crs = chain_vote::Crs::from_hash(&hex::decode(args.vote_plan_id.clone())?);
 
@@ -104,7 +100,7 @@ fn v1_exec(args: CliArgs) -> Result<(), Box<dyn Error>>  {
     let ek = ElectionPublicKey::from_bytes(&election_pk)
         .ok_or("unable to parse election pub key".to_string())?;
 
-    let (ciphertexts, proof) = ek.encrypt_and_prove_vote(&mut rng, &crs, vote);
+    let (ciphertexts, proof) = ek.encrypt_and_prove_vote(rng, &crs, vote);
     let (proof, encrypted_vote) = compose_encrypted_vote_part(ciphertexts.clone(), proof)?;
 
     let fragment_bytes = generate_vote_fragment(
@@ -123,50 +119,46 @@ fn v1_exec(args: CliArgs) -> Result<(), Box<dyn Error>>  {
     Ok(())
 }
 
-fn v2_exec(args: CliArgs) -> Result<(), Box<dyn Error>>  {
-    let mut rng = ChaCha20Rng::from_seed([0u8; 32]);
-
-    // let pk = hex::decode(args.public_key)?;
-    let mut sk = hex::decode(args.private_key)?;
+fn v2_exec(args: CliArgs, rng: &mut ChaCha20Rng) -> Result<(), Box<dyn Error>> {
+    let sk_bytes = hex::decode(args.private_key)?;
 
     // Election pub key published as a Bech32_encoded address
     // which consists of 3 parts: A Human-Readable Part (HRP) + Separator + Data:
     let (_hrp, data, _variant) =
         bech32::decode(&args.election_pub_key).map_err(Bech32Error::from)?;
 
-    let election_pk = Vec::<u8>::from_base32(&data).map_err(Bech32Error::from)?;
-
-
-
-    // join sk+pk together, api requirement
-    sk.extend(pk.clone());
-    let keypair: Keypair = Keypair::from_bytes(&sk)?;
-
+    let election_pk_bytes = Vec::<u8>::from_base32(&data).map_err(Bech32Error::from)?;
+
+    let private_key = catalyst_voting::crypto::ed25519::PrivateKey::from_bytes(
+        &sk_bytes
+            .try_into()
+            .map_err(|_| "private key invalid length")?,
+    );
+    let election_public_key =
+        catalyst_voting::vote_protocol::committee::ElectionPublicKey::from_bytes(
+            &election_pk_bytes
+                .try_into()
+                .map_err(|_| "election public key invalid length")?,
+        )?;
+
+    let vote_plan_id = hex::decode(args.vote_plan_id.clone())?
+        .try_into()
+        .map_err(|_| "vote plan id invalid length")?;
+    let proposal_index = args.proposal;
     let choice = args.choice;
 
-    let vote = chain_vote::Vote::new(2, choice.into())?;
-    // common reference string
-    let crs = chain_vote::Crs::from_hash(&hex::decode(args.vote_plan_id.clone())?);
-
-    // parse ek key
-    let ek = ElectionPublicKey::from_bytes(&election_pk)
-        .ok_or("unable to parse election pub key".to_string())?;
-
-    let (ciphertexts, proof) = ek.encrypt_and_prove_vote(&mut rng, &crs, vote);
-    let (proof, encrypted_vote) = compose_encrypted_vote_part(ciphertexts.clone(), proof)?;
-
-    let fragment_bytes = generate_vote_fragment(
-        keypair,
-        encrypted_vote,
-        proof,
-        args.proposal,
-        &hex::decode(args.vote_plan_id)?,
-        args.epoch,
-        args.slot,
+    let tx = catalyst_voting::txs::v1::Tx::new_private(
+        vote_plan_id,
+        proposal_index,
+        VOTING_OPTIONS,
+        choice,
+        &election_public_key,
+        &private_key,
+        rng,
     )?;
 
     // fragment in hex: output consumed as input to another program
-    println!("{:?}", hex::encode(fragment_bytes.clone()));
+    println!("{:?}", hex::encode(tx.to_bytes()));
 
     Ok(())
 }