diff --git a/chain/src/chain.rs b/chain/src/chain.rs
index d11162f3c3..bc0bf17a2d 100644
--- a/chain/src/chain.rs
+++ b/chain/src/chain.rs
@@ -35,8 +35,7 @@ use crate::util::secp::pedersen::{Commitment, RangeProof};
 use crate::util::{Mutex, RwLock, StopState};
 use grin_store::Error::NotFoundErr;
 use std::collections::HashMap;
-use std::env;
-use std::fs::File;
+use std::fs::{self, File};
 use std::path::PathBuf;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
@@ -850,9 +849,39 @@ impl Chain {
 
 	/// Clean the temporary sandbox folder
 	pub fn clean_txhashset_sandbox(&self) {
-		let sandbox_dir = env::temp_dir();
-		txhashset::clean_txhashset_folder(&sandbox_dir);
-		txhashset::clean_header_folder(&sandbox_dir);
+		txhashset::clean_txhashset_folder(&self.get_tmp_dir());
+		txhashset::clean_header_folder(&self.get_tmp_dir());
+	}
+
+	/// Specific tmp dir.
+	/// Normally it's ~/.grin/main/tmp for mainnet
+	/// or ~/.grin/floo/tmp for floonet
+	pub fn get_tmp_dir(&self) -> PathBuf {
+		let mut tmp_dir = PathBuf::from(self.db_root.clone());
+		tmp_dir = tmp_dir
+			.parent()
+			.expect("fail to get parent of db_root dir")
+			.to_path_buf();
+		tmp_dir.push("tmp");
+		tmp_dir
+	}
+
+	/// Get a tmp file path in above specific tmp dir (create tmp dir if not exist)
+	/// Delete file if tmp file already exists
+	pub fn get_tmpfile_pathname(&self, tmpfile_name: String) -> PathBuf {
+		let mut tmp = self.get_tmp_dir();
+		if !tmp.exists() {
+			if let Err(e) = fs::create_dir(tmp.clone()) {
+				warn!("fail to create tmp folder on {:?}. err: {}", tmp, e);
+			}
+		}
+		tmp.push(tmpfile_name);
+		if tmp.exists() {
+			if let Err(e) = fs::remove_file(tmp.clone()) {
+				warn!("fail to clean existing tmp file: {:?}. err: {}", tmp, e);
+			}
+		}
+		tmp
 	}
 
 	/// Writes a reading view on a txhashset state that's been provided to us.
@@ -876,8 +905,8 @@ impl Chain {
 
 		let header = self.get_block_header(&h)?;
 
-		// Write txhashset to sandbox (in the os temporary directory)
-		let sandbox_dir = env::temp_dir();
+		// Write txhashset to sandbox (in the Grin specific tmp dir)
+		let sandbox_dir = self.get_tmp_dir();
 		txhashset::clean_txhashset_folder(&sandbox_dir);
 		txhashset::clean_header_folder(&sandbox_dir);
 		txhashset::zip_write(sandbox_dir.clone(), txhashset_data.try_clone()?, &header)?;
diff --git a/p2p/src/peer.rs b/p2p/src/peer.rs
index d964dc84f6..4787678134 100644
--- a/p2p/src/peer.rs
+++ b/p2p/src/peer.rs
@@ -16,6 +16,7 @@ use crate::util::{Mutex, RwLock};
 use std::fmt;
 use std::fs::File;
 use std::net::{Shutdown, TcpStream};
+use std::path::PathBuf;
 use std::sync::Arc;
 
 use crate::conn;
@@ -597,6 +598,14 @@ impl ChainAdapter for TrackingAdapter {
 		self.adapter
 			.txhashset_download_update(start_time, downloaded_size, total_size)
 	}
+
+	fn get_tmp_dir(&self) -> PathBuf {
+		self.adapter.get_tmp_dir()
+	}
+
+	fn get_tmpfile_pathname(&self, tmpfile_name: String) -> PathBuf {
+		self.adapter.get_tmpfile_pathname(tmpfile_name)
+	}
 }
 
 impl NetAdapter for TrackingAdapter {
diff --git a/p2p/src/peers.rs b/p2p/src/peers.rs
index 3028b12a15..584cd9c622 100644
--- a/p2p/src/peers.rs
+++ b/p2p/src/peers.rs
@@ -15,6 +15,7 @@
 use crate::util::RwLock;
 use std::collections::HashMap;
 use std::fs::File;
+use std::path::PathBuf;
 use std::sync::Arc;
 
 use rand::{thread_rng, Rng};
@@ -586,6 +587,14 @@ impl ChainAdapter for Peers {
 		self.adapter
 			.txhashset_download_update(start_time, downloaded_size, total_size)
 	}
+
+	fn get_tmp_dir(&self) -> PathBuf {
+		self.adapter.get_tmp_dir()
+	}
+
+	fn get_tmpfile_pathname(&self, tmpfile_name: String) -> PathBuf {
+		self.adapter.get_tmpfile_pathname(tmpfile_name)
+	}
 }
 
 impl NetAdapter for Peers {
diff --git a/p2p/src/protocol.rs b/p2p/src/protocol.rs
index cc49abd3f5..37636fd08c 100644
--- a/p2p/src/protocol.rs
+++ b/p2p/src/protocol.rs
@@ -12,9 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use rand::{thread_rng, Rng};
 use std::cmp;
-use std::env;
-use std::fs::File;
+use std::fs::{self, File, OpenOptions};
 use std::io::{BufWriter, Write};
 use std::sync::Arc;
 
@@ -288,10 +288,15 @@ impl MessageHandler for Protocol {
 				self.adapter
 					.txhashset_download_update(download_start_time, 0, sm_arch.bytes);
 
-				let mut tmp = env::temp_dir();
-				tmp.push("txhashset.zip");
+				let nonce: u32 = thread_rng().gen_range(0, 1_000_000);
+				let tmp = self.adapter.get_tmpfile_pathname(format!(
+					"txhashset-{}-{}.zip",
+					download_start_time.timestamp(),
+					nonce
+				));
 				let mut save_txhashset_to_file = |file| -> Result<(), Error> {
-					let mut tmp_zip = BufWriter::new(File::create(file)?);
+					let mut tmp_zip =
+						BufWriter::new(OpenOptions::new().write(true).create_new(true).open(file)?);
 					let total_size = sm_arch.bytes as usize;
 					let mut downloaded_size: usize = 0;
 					let mut request_size = cmp::min(48_000, total_size);
@@ -332,7 +337,7 @@ impl MessageHandler for Protocol {
 					tmp,
 				);
 
-				let tmp_zip = File::open(tmp)?;
+				let tmp_zip = File::open(tmp.clone())?;
 				let res = self
 					.adapter
 					.txhashset_write(sm_arch.hash, tmp_zip, self.addr);
@@ -342,6 +347,10 @@ impl MessageHandler for Protocol {
 					sm_arch.hash, sm_arch.height, res
 				);
 
+				if let Err(e) = fs::remove_file(tmp.clone()) {
+					warn!("fail to remove tmp file: {:?}. err: {}", tmp, e);
+				}
+
 				Ok(None)
 			}
 
diff --git a/p2p/src/serv.rs b/p2p/src/serv.rs
index 55e7ff8f18..ad19743563 100644
--- a/p2p/src/serv.rs
+++ b/p2p/src/serv.rs
@@ -14,6 +14,7 @@
 
 use std::fs::File;
 use std::net::{Shutdown, SocketAddr, TcpListener, TcpStream};
+use std::path::PathBuf;
 use std::sync::Arc;
 use std::time::Duration;
 use std::{io, thread};
@@ -278,6 +279,14 @@ impl ChainAdapter for DummyAdapter {
 	) -> bool {
 		false
 	}
+
+	fn get_tmp_dir(&self) -> PathBuf {
+		unimplemented!()
+	}
+
+	fn get_tmpfile_pathname(&self, _tmpfile_name: String) -> PathBuf {
+		unimplemented!()
+	}
 }
 
 impl NetAdapter for DummyAdapter {
diff --git a/p2p/src/types.rs b/p2p/src/types.rs
index 48f308dc92..16dadc46d8 100644
--- a/p2p/src/types.rs
+++ b/p2p/src/types.rs
@@ -17,6 +17,7 @@ use std::convert::From;
 use std::fs::File;
 use std::io;
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
+use std::path::PathBuf;
 
 use std::sync::mpsc;
 use std::sync::Arc;
@@ -506,6 +507,13 @@ pub trait ChainAdapter: Sync + Send {
 	/// read as a zip file, unzipped and the resulting state files should be
 	/// rewound to the provided indexes.
 	fn txhashset_write(&self, h: Hash, txhashset_data: File, peer_addr: PeerAddr) -> bool;
+
+	/// Get the Grin specific tmp dir
+	fn get_tmp_dir(&self) -> PathBuf;
+
+	/// Get a tmp file path in above specific tmp dir (create tmp dir if not exist)
+	/// Delete file if tmp file already exists
+	fn get_tmpfile_pathname(&self, tmpfile_name: String) -> PathBuf;
 }
 
 /// Additional methods required by the protocol that don't need to be
diff --git a/servers/src/common/adapters.rs b/servers/src/common/adapters.rs
index b04e1ab704..8dade5750d 100644
--- a/servers/src/common/adapters.rs
+++ b/servers/src/common/adapters.rs
@@ -17,6 +17,7 @@
 
 use crate::util::RwLock;
 use std::fs::File;
+use std::path::PathBuf;
 use std::sync::{Arc, Weak};
 use std::thread;
 use std::time::Instant;
@@ -374,6 +375,14 @@ impl p2p::ChainAdapter for NetToChainAdapter {
 			true
 		}
 	}
+
+	fn get_tmp_dir(&self) -> PathBuf {
+		self.chain().get_tmp_dir()
+	}
+
+	fn get_tmpfile_pathname(&self, tmpfile_name: String) -> PathBuf {
+		self.chain().get_tmpfile_pathname(tmpfile_name)
+	}
 }
 
 impl NetToChainAdapter {