From 9287a16b09f60064eead0ee1590468a0ab20c61f Mon Sep 17 00:00:00 2001
From: Giacomo Pasini <g.pasini98@gmail.com>
Date: Thu, 24 Apr 2025 13:22:35 +0200
Subject: [PATCH] use tempfile

---
 sz-poc-offsite-2025/evm/lightnode/Cargo.toml        |  1 +
 sz-poc-offsite-2025/evm/lightnode/src/proofcheck.rs | 10 ++++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/sz-poc-offsite-2025/evm/lightnode/Cargo.toml b/sz-poc-offsite-2025/evm/lightnode/Cargo.toml
index d05e98f..da314fa 100644
--- a/sz-poc-offsite-2025/evm/lightnode/Cargo.toml
+++ b/sz-poc-offsite-2025/evm/lightnode/Cargo.toml
@@ -18,3 +18,4 @@ url = { version = "2" }
 hex = { version = "0.4" }
 futures = { version = "0.3" }
 kzgrs-backend = { git = "https://github.com/logos-co/nomos", branch = "master" }
+tempfile = "3.19.1"
diff --git a/sz-poc-offsite-2025/evm/lightnode/src/proofcheck.rs b/sz-poc-offsite-2025/evm/lightnode/src/proofcheck.rs
index a3a3b72..13ba32c 100644
--- a/sz-poc-offsite-2025/evm/lightnode/src/proofcheck.rs
+++ b/sz-poc-offsite-2025/evm/lightnode/src/proofcheck.rs
@@ -1,5 +1,6 @@
 use tokio::process::Command;
 use std::path::Path;
+use std::io::Write;
 use reqwest::Url;
 use tracing::{error, info};
 
@@ -25,9 +26,10 @@ pub async fn verify_proof(
         .bytes()
         .await
         .map_err(|e| format!("Failed to read proof response: {}", e))?;
-    let filename = format!("{}-{}.zkp", block_number, block_count + block_number);
-    tokio::fs::write(&filename, &proof)
-        .await
+
+    let mut tempfile = tempfile::NamedTempFile::new()
+        .map_err(|e| format!("Failed to create temporary file: {}", e))?;
+    tempfile.write_all(&proof)
         .map_err(|e| format!("Failed to write proof to file: {}", e))?;
   
 
@@ -37,7 +39,7 @@ pub async fn verify_proof(
             &format!("--rpc={}", rpc),
             &format!("--block-number={}", block_number),
             &format!("--block-count={}", block_count),
-            &format!("--file={}", filename),
+            &format!("--file={}", tempfile.path().display()),
         ])
         .output().await
         .map_err(|e| format!("Failed to execute zeth-ethereum verify: {}", e))?;