diff --git a/Cargo.lock b/Cargo.lock
index 6b210d38a5..20302f8aac 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -76,8 +76,11 @@ checksum = "94a45b455c14666b85fc40a019e8ab9eb75e3a124e05494f5397122bc9eb06e0"
 name = "app"
 version = "0.1.0"
 dependencies = [
+ "bandwidth-claim-contract",
+ "bip39",
  "coconut-interface",
  "credentials",
+ "network-defaults",
  "serde",
  "serde_json",
  "tauri",
diff --git a/clients/tauri-client/src-tauri/Cargo.toml b/clients/tauri-client/src-tauri/Cargo.toml
index 075ec15f4d..ab0a8109e7 100644
--- a/clients/tauri-client/src-tauri/Cargo.toml
+++ b/clients/tauri-client/src-tauri/Cargo.toml
@@ -15,6 +15,7 @@ build = "src/build.rs"
 tauri-build = { version = "1.0.0-beta.2" }
 
 [dependencies]
+bip39 = "1.0.1"
 serde_json = "1.0"
 serde = { version = "1.0", features = ["derive"] }
 tauri = { version = "1.0.0-beta.4", features = [] }
@@ -23,7 +24,9 @@ url = "2.2"
 
 coconut-interface = { path = "../../../common/coconut-interface" }
 credentials = { path = "../../../common/credentials" }
-validator-client = {path = "../../../common/client-libs/validator-client"}
+validator-client = {path = "../../../common/client-libs/validator-client", features = ["nymd-client"] }
+bandwidth-claim-contract = { path = "../../../common/bandwidth-claim-contract" }
+network-defaults = { path = "../../../common/network-defaults" }
 
 [features]
 default = ["custom-protocol"]
diff --git a/clients/tauri-client/src-tauri/src/main.rs b/clients/tauri-client/src-tauri/src/main.rs
index de1168e79c..a9c367663c 100644
--- a/clients/tauri-client/src-tauri/src/main.rs
+++ b/clients/tauri-client/src-tauri/src/main.rs
@@ -3,8 +3,11 @@
   windows_subsystem = "windows"
 )]
 
+use bip39::Mnemonic;
+use std::str::FromStr;
 use std::sync::Arc;
 
+use bandwidth_claim_contract::msg::ExecuteMsg;
 use tokio::sync::RwLock;
 use url::Url;
 
@@ -14,6 +17,7 @@ use coconut_interface::{
 };
 use credentials::coconut::bandwidth::{obtain_signature, BandwidthVoucherAttributes};
 use credentials::obtain_aggregate_verification_key;
+use validator_client::nymd::{AccountId, CosmosCoin, Decimal, Denom, NymdClient};
 
 struct State {
   signatures: Vec<Signature>,
@@ -55,15 +59,37 @@ fn parse_url_validators(raw: &[String]) -> Result<Vec<Url>, String> {
 }
 
 #[tauri::command]
-async fn randomise_credential(
-  idx: usize,
-  state: tauri::State<'_, Arc<RwLock<State>>>,
-) -> Result<Vec<Signature>, String> {
-  let mut state = state.write().await;
-  let signature = state.signatures.remove(idx);
-  let (new_signature, _) = signature.randomise(&state.params);
-  state.signatures.insert(idx, new_signature);
-  Ok(state.signatures.clone())
+async fn deposit_funds(_state: tauri::State<'_, Arc<RwLock<State>>>) -> Result<String, String> {
+  let nymd_url = Url::from_str("http://127.0.0.1:26657").unwrap();
+  let mnemonic = Mnemonic::from_str(&"sun surge soon stomach flavor country gorilla dress oblige stamp attract hip soldier agree steel prize nuclear know enjoy arm bargain always theme matter").unwrap();
+  let nymd_client = NymdClient::connect_with_mnemonic(
+    network_defaults::all::Network::SANDBOX,
+    nymd_url.as_ref(),
+    None,
+    None,
+    AccountId::from_str("nymt14hj2tavq8fpesdwxxcu44rty3hh90vhuysqrsr").ok(),
+    mnemonic,
+    None,
+  )
+  .expect("Could not create nymd client");
+  let req = ExecuteMsg::BuyBandwidth {};
+  let funds = vec![CosmosCoin {
+    denom: Denom::from_str(network_defaults::sandbox::DENOM).unwrap(),
+    amount: Decimal::from(1000000u64),
+  }];
+  let tx = nymd_client
+    .execute(
+      nymd_client.erc20_bridge_contract_address().unwrap(),
+      &req,
+      Default::default(),
+      "",
+      funds,
+    )
+    .await
+    .unwrap()
+    .transaction_hash;
+  println!("Tx hash: {}", tx);
+  Ok(tx.to_string())
 }
 
 #[tauri::command]
@@ -206,7 +232,7 @@ fn main() {
     ))))
     .invoke_handler(tauri::generate_handler![
       get_credential,
-      randomise_credential,
+      deposit_funds,
       delete_credential,
       list_credentials,
       verify_credential
diff --git a/clients/tauri-client/src/routes/index.svelte b/clients/tauri-client/src/routes/index.svelte
index 3e068fb820..2ca8fff3e7 100644
--- a/clients/tauri-client/src/routes/index.svelte
+++ b/clients/tauri-client/src/routes/index.svelte
@@ -6,6 +6,7 @@
   const validator_urls = ["http://localhost:8080", "http://localhost:8081", "http://localhost:8082"];
   let signatures = [];
   let qrVisible = false;
+  let tx_hash = "";
 
   async function getCredential() {
     signatures = await invoke("get_credential", {
@@ -13,10 +14,8 @@
     });
   }
 
-  async function randomiseCredential(idx) {
-    signatures = await invoke("randomise_credential", {
-      idx: idx,
-    });
+  async function depositFunds() {
+    tx_hash = await invoke("deposit_funds");
   }
 
   async function verifyCredential(idx) {
@@ -58,6 +57,7 @@
   <title>Coconut</title>
 </svelte:head>
 
+<button class="btn btn-success" on:click={depositFunds}>Deposit</button>
 <button class="btn btn-success" on:click={getCredential}>Get Credential</button>
 <hr />
 <table class="table table-dark">
@@ -67,11 +67,6 @@
       <td>
         <div class="btn-group" role="group" aria-label="Basic example">
           <button
-            class="btn btn-primary"
-            on:click={() => {
-              randomiseCredential(idx);
-            }}>Randomize</button
-          ><button
             class="btn btn-danger"
             on:click={() => {
               deleteCredential(idx);
diff --git a/validator-api/src/coconut/mod.rs b/validator-api/src/coconut/mod.rs
index 1532d738b4..3531d2de66 100644
--- a/validator-api/src/coconut/mod.rs
+++ b/validator-api/src/coconut/mod.rs
@@ -82,7 +82,7 @@ pub async fn post_blind_sign(
         nymd_url.as_ref(),
         None,
         None,
-        AccountId::from_str("").ok(),
+        AccountId::from_str("nymt14hj2tavq8fpesdwxxcu44rty3hh90vhuysqrsr").ok(),
         mnemonic,
         None,
     )