diff --git a/phase2/Cargo.toml b/phase2/Cargo.toml
index 522a10c..a3c740a 100644
--- a/phase2/Cargo.toml
+++ b/phase2/Cargo.toml
@@ -24,6 +24,7 @@ num-traits = "0.2.8"
 itertools = "0.9.0"
 hex = "0.4.0"
 cfg-if = "0.1.10"
+reqwest = { version = "0.10", features = ["blocking"] }
 bellman_ce = { path = "../bellman", default-features = false } # active features depend on build type
 
 # needed for native only but don't break wasm if present
diff --git a/phase2/src/bin/curl.rs b/phase2/src/bin/curl.rs
new file mode 100644
index 0000000..6b615f1
--- /dev/null
+++ b/phase2/src/bin/curl.rs
@@ -0,0 +1,89 @@
+#![allow(unused_imports)]
+
+extern crate reqwest;
+extern crate phase2;
+extern crate itertools;
+extern crate blake2;
+extern crate rand;
+extern crate byteorder;
+
+use std::io::Read;
+use std::io::Write;
+use std::fs::{File, OpenOptions};
+use phase2::parameters::MPCParameters;
+use itertools::Itertools;
+use blake2::Digest;
+use reqwest::blocking::multipart;
+use std::time::Duration;
+
+fn main() {
+    let disallow_points_at_infinity = false;
+    let entropy = "qweqwe";
+
+    println!("Downloading challenge...");
+    let mut resp = reqwest::blocking::get("https://trustedaf.poma.in/challenge").unwrap();
+    if !resp.status().is_success() {
+        println!("Cannot download challenge");
+        std::process::exit(1);
+    }
+    let mut challenge: Vec<u8> = vec![];
+    resp.copy_to(&mut challenge).unwrap();
+    File::create("challenge").unwrap().write_all(&*challenge).unwrap();
+
+    let mut rng = {
+        use byteorder::{ReadBytesExt, BigEndian};
+        use blake2::{Blake2b, Digest};
+        use rand::{SeedableRng, Rng, OsRng};
+        use rand::chacha::ChaChaRng;
+
+        let h = {
+            let mut system_rng = OsRng::new().unwrap();
+            let mut h = Blake2b::default();
+
+            // Gather 1024 bytes of entropy from the system
+            for _ in 0..1024 {
+                let r: u8 = system_rng.gen();
+                h.input(&[r]);
+            }
+
+            // Hash it all up to make a seed
+            h.input(&entropy.as_bytes());
+            h.result()
+        };
+
+        let mut digest = &h[..];
+
+        // Interpret the first 32 bytes of the digest as 8 32-bit words
+        let mut seed = [0u32; 8];
+        for i in 0..8 {
+            seed[i] = digest.read_u32::<BigEndian>().expect("digest is large enough for this to work");
+        }
+
+        ChaChaRng::from_seed(&seed)
+    };
+    let mut params = MPCParameters::read(&*challenge, disallow_points_at_infinity, true).expect("unable to read params");
+
+    println!("Contributing...");
+    let hash = params.contribute(&mut rng);
+    println!("Contribution hash: 0x{:02x}", hash.iter().format(""));
+
+    println!("Sending parameters");
+    let mut response: Vec<u8> = vec![];
+    params.write(&mut response).expect("failed to write updated parameters");
+    File::create("response").unwrap().write_all(&*response).unwrap();
+
+    let part = multipart::Part::bytes(response).file_name("response").mime_str("application/octet-stream").unwrap();
+    let client = reqwest::blocking::Client::new();
+    let resp = client.post("https://trustedaf.poma.in/response")
+        .multipart(multipart::Form::new().part("response", part))
+        .timeout(Duration::from_secs(300))
+        .send()
+        .unwrap();
+
+    if !resp.status().is_success() {
+        println!("Cannot upload response");
+        std::process::exit(1);
+    }
+
+    println!("Done");
+}