diff --git a/api/src/owner_rpc.rs b/api/src/owner_rpc.rs
index 7caf46c61..e159beceb 100644
--- a/api/src/owner_rpc.rs
+++ b/api/src/owner_rpc.rs
@@ -378,7 +378,7 @@ pub trait OwnerRpc {
 					"num_change_outputs": 1,
 					"selection_strategy_is_use_all": true,
 					"target_slate_version": null,
-					"payment_proof_recipient_address": "slatepack10qlk22rxjap2ny8qltc2tl996kenxr3hhwuu6hrzs6tdq08yaqgqnlumr7",
+					"payment_proof_recipient_address": "tgrin1xtxavwfgs48ckf3gk8wwgcndmn0nt4tvkl8a7ltyejjcy2mc6nfs9gm2lp",
 					"ttl_blocks": null,
 					"send_args": null
 				}
@@ -398,7 +398,7 @@ pub trait OwnerRpc {
 					"id": "0436430c-2b02-624c-2032-570501212b00",
 					"off": "0gKWSQAAAADTApZJAAAAANQClkkAAAAA1QKWSQAAAAA=",
 					"proof": {
-						"raddr": "eD9lKGaXQqmQ4Prwpfyl1bMzDje7uc1cYoaW0Dzk6BA=",
+						"raddr": "Ms3WOSiFT4smKLHc5GJt3N811Wy3z999ZMylgit41NM=",
 						"saddr": "Ms3WOSiFT4smKLHc5GJt3N811Wy3z999ZMylgit41NM="
 					},
 					"sigs": [
@@ -1409,7 +1409,7 @@ pub trait OwnerRpc {
 		"id": 1,
 		"jsonrpc": "2.0",
 		"result": {
-			"Ok": "slatepack1xtxavwfgs48ckf3gk8wwgcndmn0nt4tvkl8a7ltyejjcy2mc6nfskdvkdu"
+			"Ok": "tgrin1xtxavwfgs48ckf3gk8wwgcndmn0nt4tvkl8a7ltyejjcy2mc6nfs9gm2lp"
 		}
 	}
 	# "#
@@ -1498,7 +1498,7 @@ pub trait OwnerRpc {
 		"id": 1,
 		"jsonrpc": "2.0",
 		"result": {
-			"Ok": "BEGINSLATEPACK. 8GQrdcwdLKJD28F 3a9siP7ZhZgAh7w BR2EiZHza5WMWmZ Cc8zBUemrrYRjhq j3VBwA8vYnvXXKU BDmQBN2yKgmR8mX UzvXHezfznA61d7 qFZYChhz94vd8Ew NEPLz7jmcVN2C3w wrfHbeiLubYozP2 uhLouFiYRrbe3fQ 4uhWGfT3sQYXScT dAeo29EaZJpfauh j8VL5jsxST2SPHq nzXFC2w9yYVjt7D ju7GSgHEp5aHz9R xstGbHjbsb4JQod kYLuELta1ohUwDD pvjhyJmsbLcsPei k5AQhZsJ8RJGBtY bou6cU7tZeFJvor 4LB9CBfFB3pmVWD vSLd5RPS75dcnHP nbXD8mSDZ8hJS2Q A9wgvppWzuWztJ2 dLUU8f9tLJgsRBw YZAs71HiVeg7. ENDSLATEPACK.\n"
+			"Ok": "BEGINSLATEPACK. t9EcGgrKr1GFCQB SK2jPCxME6Hgpqx bntpQm3zKFycoPY nW4UeoL4KQ7ExNK At6EQsvpz6MjUs8 6WG8KHEbMfqufJQ ZJTw2gkcdJmJjiJ f29oGgYqqXDZox4 ujPSjrtoxCN4h3e i1sZ8dYsm3dPeXL 7VQLsYNjAefciqj ZJXPm4Pqd7VDdd4 okGBGBu3YJvYzT6 arAxeCEx66us31h AJLcDweFwyWBkW5 J1DLiYAjt5ftFTo CjpfW9KjiLq2LM5 jepXWEHJPSDAYVK 4macDZUhRbJiG6E hrQcPrJBVC716mb Hw5E1PFrE6on5wq oEmrS4j9vaB5nw8 Z9ZyXvPc2LN7tER yt6pSHZeY9EpYdY zv4bthzfRfF8ePT TMeMpV2gpgyRXQa CPD2TR. ENDSLATEPACK.\n"
 		}
 	}
 	# "#
@@ -1577,7 +1577,7 @@ pub trait OwnerRpc {
 		"jsonrpc": "2.0",
 		"method": "decode_slatepack_message",
 		"params": {
-			"message": "BEGINSLATEPACK. 8GQrdcwdLKJD28F 3a9siP7ZhZgAh7w\nBR2EiZHza5WMWmZ Cc8zBUemrrYRjhq j3VBwA8vYnvXXKU\nBDmQBN2yKgmR8mX UzvXHezfznA61d7 qFZYChhz94vd8Ew\nNEPLz7jmcVN2C3w wrfHbeiLubYozP2 uhLouFiYRrbe3fQ\n4uhWGfT3sQYXScT dAeo29EaZJpfauh j8VL5jsxST2SPHq\nnzXFC2w9yYVjt7D ju7GSgHEp5aHz9R xstGbHjbsb4JQod\nkYLuELta1ohUwDD pvjhyJmsbLcsPei k5AQhZsJ8RJGBtY\nbou6cU7tZeFJvor 4LB9CBfFB3pmVWD vSLd5RPS75dcnHP\nnbXD8mSDZ8hJS2Q A9wgvppWzuWztJ2 dLUU8f9tLJgsRBw\nYZAs71HiVeg7. ENDSLATEPACK.\n",
+			"message": "BEGINSLATEPACK. t9EcGgrKr1GFCQB SK2jPCxME6Hgpqx bntpQm3zKFycoPY nW4UeoL4KQ7ExNK At6EQsvpz6MjUs8 6WG8KHEbMfqufJQ ZJTw2gkcdJmJjiJ f29oGgYqqXDZox4 ujPSjrtoxCN4h3e i1sZ8dYsm3dPeXL 7VQLsYNjAefciqj ZJXPm4Pqd7VDdd4 okGBGBu3YJvYzT6 arAxeCEx66us31h AJLcDweFwyWBkW5 J1DLiYAjt5ftFTo CjpfW9KjiLq2LM5 jepXWEHJPSDAYVK 4macDZUhRbJiG6E hrQcPrJBVC716mb Hw5E1PFrE6on5wq oEmrS4j9vaB5nw8 Z9ZyXvPc2LN7tER yt6pSHZeY9EpYdY zv4bthzfRfF8ePT TMeMpV2gpgyRXQa CPD2TR. ENDSLATEPACK.\n",
 			"decrypt" : false
 		},
 		"id": 1
@@ -1592,7 +1592,7 @@ pub trait OwnerRpc {
 			"Ok": {
 				"mode": 0,
 				"payload": "AAQAAgQ2QwwrAmJMIDJXBQEhKwAB0gKWSQAAAADTApZJAAAAANQClkkAAAAA1QKWSQAAAAAGAAAAAWWgvAAAAAAAAHoSAAEAAjh4zoRXJ/Ok7HbKPz20s4otBdY2uMNjIQi4V/7WPJbeAxuExVZ7EmRAmV0+1aq6BWXXHhg0YEgZ/5wX9enV3QePAjLN1jkohU+LJiix3ORibdzfNdVst8/ffWTMpYIreNTTeD9lKGaXQqmQ4Prwpfyl1bMzDje7uc1cYoaW0Dzk6BAA",
-				"sender": "slatepack1xtxavwfgs48ckf3gk8wwgcndmn0nt4tvkl8a7ltyejjcy2mc6nfskdvkdu",
+				"sender": "tgrin1xtxavwfgs48ckf3gk8wwgcndmn0nt4tvkl8a7ltyejjcy2mc6nfs9gm2lp",
 				"slatepack": "1.0"
 			}
 		}
@@ -1634,9 +1634,9 @@ pub trait OwnerRpc {
 			"Ok": {
 				"amount": "60000000000",
 				"excess": "091f151170bfac881479bfb56c7012c52cd4ce4198ad661586374dd499925922fb",
-				"recipient_address": "slatepack10qlk22rxjap2ny8qltc2tl996kenxr3hhwuu6hrzs6tdq08yaqgqnlumr7",
+				"recipient_address": "tgrin10qlk22rxjap2ny8qltc2tl996kenxr3hhwuu6hrzs6tdq08yaqgqq6t83r",
 				"recipient_sig": "b9b1885a3f33297df32e1aa4db23220bd305da8ed92ff6873faf3ab2c116fea25e9d0e34bd4f567f022b88a37400821ffbcaec71c9a8c3a327c4626611886d0d",
-				"sender_address": "slatepack1xtxavwfgs48ckf3gk8wwgcndmn0nt4tvkl8a7ltyejjcy2mc6nfskdvkdu",
+				"sender_address": "tgrin1xtxavwfgs48ckf3gk8wwgcndmn0nt4tvkl8a7ltyejjcy2mc6nfs9gm2lp",
 				"sender_sig": "611b92331e395c3d29871ac35b1fce78ec595e28ccbe8cc55452da40775e8e46d35a2e84eaffd986935da3275e34d46a8d777d02dabcf4339704c2a621da9700"
 			}
 		}
diff --git a/libwallet/src/slatepack/address.rs b/libwallet/src/slatepack/address.rs
index 1ba63a0db..316039432 100644
--- a/libwallet/src/slatepack/address.rs
+++ b/libwallet/src/slatepack/address.rs
@@ -20,6 +20,7 @@ use rand::{thread_rng, Rng};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use x25519_dalek::PublicKey as xDalekPublicKey;
 
+use crate::grin_core::global;
 use crate::grin_core::ser::{self, Readable, Reader, Writeable, Writer};
 use crate::grin_util::secp::key::SecretKey;
 use crate::util::OnionV3Address;
@@ -43,8 +44,12 @@ pub struct SlatepackAddress {
 impl SlatepackAddress {
 	/// new with default hrp
 	pub fn new(pub_key: &edDalekPublicKey) -> Self {
+		let hrp = match global::get_chain_type() {
+			global::ChainTypes::Mainnet => "grin",
+			_ => "tgrin",
+		};
 		Self {
-			hrp: String::from("slatepack"),
+			hrp: String::from(hrp),
 			pub_key: pub_key.clone(),
 		}
 	}
@@ -236,6 +241,7 @@ impl Readable for SlatepackAddress {
 #[test]
 fn slatepack_address() -> Result<(), Error> {
 	use rand::{thread_rng, Rng};
+	global::set_local_chain_type(global::ChainTypes::AutomatedTesting);
 	let sec_key_bytes: [u8; 32] = thread_rng().gen();
 
 	let ed_sec_key = edDalekSecretKey::from_bytes(&sec_key_bytes).unwrap();
diff --git a/libwallet/src/slatepack/types.rs b/libwallet/src/slatepack/types.rs
index 6ae7252e8..1f50e581a 100644
--- a/libwallet/src/slatepack/types.rs
+++ b/libwallet/src/slatepack/types.rs
@@ -640,7 +640,9 @@ fn slatepack_bin_basic_ser() -> Result<(), grin_wallet_util::byte_ser::Error> {
 
 #[test]
 fn slatepack_bin_opt_fields_ser() -> Result<(), grin_wallet_util::byte_ser::Error> {
+	use crate::grin_core::global;
 	use grin_wallet_util::byte_ser;
+	global::set_local_chain_type(global::ChainTypes::AutomatedTesting);
 	let mut payload: Vec<u8> = Vec::with_capacity(243);
 	for _ in 0..payload.capacity() {
 		payload.push(rand::random());
@@ -663,11 +665,12 @@ fn slatepack_bin_opt_fields_ser() -> Result<(), grin_wallet_util::byte_ser::Erro
 // ensure that a slatepack with unknown data in the optional fields can be read
 #[test]
 fn slatepack_bin_future() -> Result<(), grin_wallet_util::byte_ser::Error> {
+	use crate::grin_core::global;
 	use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 	use grin_wallet_util::byte_ser;
 	use rand::{thread_rng, Rng};
 	use std::io::Cursor;
-
+	global::set_local_chain_type(global::ChainTypes::AutomatedTesting);
 	let payload_size = 1234;
 	let mut payload: Vec<u8> = Vec::with_capacity(payload_size);
 	for _ in 0..payload.capacity() {
@@ -696,14 +699,14 @@ fn slatepack_bin_future() -> Result<(), grin_wallet_util::byte_ser::Error> {
 	// opt fields len (bytes to payload) 4
 	// bytes 5-8 are opt fields len
 
-	// sender 68
+	// sender 64
 
 	let mut opt_fields_len_bytes = [0u8; 4];
 	opt_fields_len_bytes.copy_from_slice(&ser[5..9]);
 	let mut rdr = Cursor::new(opt_fields_len_bytes.to_vec());
 	let opt_fields_len = rdr.read_u32::<BigEndian>().unwrap();
 	// check this matches what we expect below
-	assert_eq!(opt_fields_len, 69);
+	assert_eq!(opt_fields_len, 65);
 
 	let end_head_pos = opt_fields_len as usize + 8 + 1;
 
@@ -740,11 +743,14 @@ fn slatepack_bin_future() -> Result<(), grin_wallet_util::byte_ser::Error> {
 // if mode == 1
 #[test]
 fn slatepack_encrypted_meta() -> Result<(), Error> {
+	use crate::grin_core::global;
 	use crate::{Slate, SlateVersion, VersionedBinSlate, VersionedSlate};
 	use ed25519_dalek::PublicKey as edDalekPublicKey;
 	use ed25519_dalek::SecretKey as edDalekSecretKey;
 	use rand::{thread_rng, Rng};
 	use std::convert::TryFrom;
+	global::set_local_chain_type(global::ChainTypes::AutomatedTesting);
+
 	let sec_key_bytes: [u8; 32] = thread_rng().gen();
 
 	let ed_sec_key = edDalekSecretKey::from_bytes(&sec_key_bytes).unwrap();
@@ -786,11 +792,14 @@ fn slatepack_encrypted_meta() -> Result<(), Error> {
 // metadata won't break parsing
 #[test]
 fn slatepack_encrypted_meta_future() -> Result<(), Error> {
+	use crate::grin_core::global;
 	use crate::{Slate, SlateVersion, VersionedBinSlate, VersionedSlate};
 	use ed25519_dalek::PublicKey as edDalekPublicKey;
 	use ed25519_dalek::SecretKey as edDalekSecretKey;
 	use rand::{thread_rng, Rng};
 	use std::convert::TryFrom;
+	global::set_local_chain_type(global::ChainTypes::AutomatedTesting);
+
 	let sec_key_bytes: [u8; 32] = thread_rng().gen();
 
 	let ed_sec_key = edDalekSecretKey::from_bytes(&sec_key_bytes).unwrap();
diff --git a/tests/cmd_line_basic.rs b/tests/cmd_line_basic.rs
index 3de7b43a6..1b991f2ce 100644
--- a/tests/cmd_line_basic.rs
+++ b/tests/cmd_line_basic.rs
@@ -302,7 +302,7 @@ fn command_line_test_impl(test_dir: &str) -> Result<(), grin_wallet_controller::
 		"mining",
 		"send",
 		"-d",
-		"slatepack1ak8aaxpjg6ct5uje4lgzvjp65l0nrmgxndp5xjy74sumzp7wasyspux2f5",
+		"tgrin1ak8aaxpjg6ct5uje4lgzvjp65l0nrmgxndp5xjy74sumzp7wasysje3kmf",
 		"10",
 	];
 	execute_command(&app, test_dir, "wallet1", &client1, arg_vec)?;