diff --git a/__crypto/btc-address/src/main.rs b/__crypto/btc-address/src/main.rs
index 160bfd0..dbcc646 100644
--- a/__crypto/btc-address/src/main.rs
+++ b/__crypto/btc-address/src/main.rs
@@ -1,14 +1,34 @@
-use std::{ thread, sync::{ Arc, Mutex } };
-use rand::rngs::OsRng;
-use secp256k1::{ Secp256k1, key::PublicKey };
-use sha2::Sha256;
-use ripemd160::Ripemd160;
-use digest::{ Input, FixedOutput };
+use std::{sync::{Arc, Mutex}, thread};
 
-const PREFIX: &[&str] = &["1Hatter"];
+use digest::{FixedOutput, Input};
+use rand::rngs::OsRng;
+use ripemd160::Ripemd160;
+use secp256k1::{key::PublicKey, Secp256k1};
+use sha2::Sha256;
 
 fn main() {
-    println!("Prefix: {:?}", PREFIX);
+    let args = std::env::args();
+    if args.len() <= 1 {
+        println!("[ERROR] Need at least one argument, e.g. 1Hatter 1UTF8 ...");
+        return;
+    }
+    let continue_on_found = std::env::var("CONTINUE_ON_FOUND")
+        .map(|c| c.to_lowercase())
+        .map(|c| c == "1" || c == "true" || c == "yes" || c == "on")
+        .unwrap_or_else(|_| false);
+
+    let prefixes: Vec<String> = args.skip(1).collect();
+    println!("Prefixes: {:?}", prefixes);
+    if continue_on_found {
+        println!("CONTINUE_ON_FOUND is ON");
+    } else {
+        println!("CONTINUE_ON_FOUND is OFF");
+    }
+    let loop_count = std::env::var("LOOP_COUNT")
+        .map(|c| c.parse::<u64>())
+        .unwrap_or_else(|_| Ok(10_000_000_u64))
+        .unwrap_or_else(|_| 10_000_000_u64);
+    println!("LOOP_COUNT={}", loop_count);
 
     let num_of_vcpus = num_cpus::get();
     let num_of_phycpus = num_cpus::get_physical();
@@ -19,8 +39,9 @@ fn main() {
     for ind in 0..num_of_phycpus {
         println!("- Running task {} of {}", ind, num_of_phycpus);
         let the_stop_flag = Arc::clone(&stop_flag);
+        let prefixes = prefixes.clone();
         let child = thread::spawn(move || {
-            run_one_task(ind, the_stop_flag);
+            run_one_task(prefixes, continue_on_found, loop_count, ind, the_stop_flag);
         });
         handles.push(child);
     }
@@ -30,11 +51,11 @@ fn main() {
     println!("Finished!");
 }
 
-fn run_one_task(ind: usize, the_stop_flag: Arc<Mutex<bool>>) {
+fn run_one_task(prefixes: Vec<String>, continue_on_found: bool, loop_count: u64, ind: usize, the_stop_flag: Arc<Mutex<bool>>) {
     let secp = Secp256k1::new();
     let mut rng = OsRng::new().expect("OsRng");
 
-    for i in 0..10_000_000 {
+    for i in 0..loop_count {
         let (secret_key, public_key) = secp.generate_keypair(&mut rng);
 
         let s = make_btc_address(&public_key);
@@ -47,12 +68,13 @@ fn run_one_task(ind: usize, the_stop_flag: Arc<Mutex<bool>>) {
                 println!("> {} - {}", ind, i);
             }
         }
-        if PREFIX.iter().any(|p| s.starts_with(p)) {
-            println!("{}", s);
-            println!("{}", secret_key);
+        if prefixes.iter().any(|p| s.starts_with(p)) {
+            println!(">> {}\n{}", s, secret_key);
 
-            *the_stop_flag.lock().unwrap() = true;
-            break;
+            if !continue_on_found {
+                *the_stop_flag.lock().unwrap() = true;
+                break;
+            }
         }
     }
 }