diff --git a/docs/concepts/namespaces.md b/docs/concepts/namespaces.md
index 74129697c88..3c8d1f797a1 100644
--- a/docs/concepts/namespaces.md
+++ b/docs/concepts/namespaces.md
@@ -4,13 +4,19 @@ id: namespaces
 
 # Namespaces
 
-Namespaces provide users with the exclusive capability to publish contracts under their designated namespaces, similar to GitHub's user and organization model.
+Namespaces provide users with the exclusive capability to publish contracts under their designated namespaces,
+similar to GitHub's user and organization model.
 
-This feature is currently a work in progress (WIP). To learn more about namespaces, please checkout https://github.com/gnolang/gno/issues/1107.
+:::warn Not enabled
+
+This feature isn't enabled by default on the portal loop chain and is currently available only on test4.gno.land.
+
+:::
 
 # Package Path
 
-A package path is a unique identifier for each package/realm. It specifies the location of the package source code which helps differentiate it from others. You can use a package path to:
+A package path is a unique identifier for each package/realm. It specifies the location of the package source
+code which helps differentiate it from others. You can use a package path to:
 
 - Call a specific function from a package/realm. (e.g using `gnokey maketx call`)
 - Import it in other packages/realms.
@@ -21,7 +27,9 @@ Here's a breakdown of the structure of a package path:
 - Type: Defines the type of package.
     - `p/`: [Package](packages.md)
     - `r/`: [Realm](realms.md)
-- Namespace: A namespace can be included after the type (e.g., user or organization name). Namespaces are a way to group related packages or realms, but currently ownership cannot be claimed. (see [Issue #1107](https://github.com/gnolang/gno/issues/1107) for more info)
+- Namespace: A namespace can be included after the type (e.g., user or organization name). Namespaces are a
+  way to group related packages or realms, but currently ownership cannot be claimed. (see 
+  [Issue#1107](https://github.com/gnolang/gno/issues/1107) for more info)
 - Remaining Path: The remaining part of the path.
     - Can only contain alphanumeric characters (letters and numbers) and underscores.
     - No special characters allowed (except underscore).
@@ -33,3 +41,51 @@ Examples:
 
 - `gno.land/p/demo/avl`: This signifies a package named `avl` within the `demo` namespace.
 - `gno.land/r/gnoland/home`: This signifies a realm named `home` within the `gnoland` namespace.
+
+## Registration Process
+
+The registration process is contract-based. The `AddPkg` command references
+`sys/users` for filtering, which in turn is based on `r/demo/users`.
+
+When `sys/users` is enabled, you need to register a name using `r/demo/users`. You can call the
+`r/demo/users.Register` function to register the name for the caller's address.
+
+> ex: `test1` user registering as `patrick`
+```bash
+$ gnokey maketx call -pkgpath gno.land/r/demo/users \
+    -func Register \
+    -gas-fee 1000000ugnot -gas-wanted 2000000 \
+    -broadcast \
+    -chainid=test4 \
+    -send=20000000ugnot \
+    -args '' \
+    -args 'patrick' \
+    -args 'My Profile Quote' test1
+```
+
+:::note Chain-ID
+
+Do not forget to update chain id, adequate to the network you're interacting with
+
+:::
+
+
+After successful registration, you can add a package under the registered namespace.
+
+## Anonymous Namespace
+
+Gno.land offers the ability to add a package without having a registered namespace. 
+You can do this by using your own address as a namespace. This is formatted as `{p,r}/{std.Address}/**`. 
+
+> ex:  with `test1` user adding a package `microblog` using his own address as namespace
+```bash
+$ gnokey maketx addpkg \
+    --pkgpath "gno.land/r/g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5/microblog" \
+    --pkgdir "examples/gno.land/p/demo/microblog" \
+    --deposit 100000000ugnot \
+    --gas-fee 1000000ugnot \
+    --gas-wanted 2000000 \
+    --broadcast \
+    --chainid test4 \
+    test1
+```
diff --git a/examples/gno.land/r/demo/boards/z_0_b_filetest.gno b/examples/gno.land/r/demo/boards/z_0_b_filetest.gno
index 5405a2508ec..9bcbe9ffafa 100644
--- a/examples/gno.land/r/demo/boards/z_0_b_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_0_b_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 199000000ugnot
+// SEND: 19900000ugnot
 
 import (
 	"gno.land/r/demo/boards"
@@ -20,4 +20,4 @@ func main() {
 }
 
 // Error:
-// payment must not be less than 200000000
+// payment must not be less than 20000000
diff --git a/examples/gno.land/r/demo/boards/z_0_filetest.gno b/examples/gno.land/r/demo/boards/z_0_filetest.gno
index 1debeecba04..e20964d50b7 100644
--- a/examples/gno.land/r/demo/boards/z_0_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_0_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 200000000ugnot
+// SEND: 20000000ugnot
 
 import (
 	"gno.land/r/demo/boards"
diff --git a/examples/gno.land/r/demo/boards/z_10_b_filetest.gno b/examples/gno.land/r/demo/boards/z_10_b_filetest.gno
index 58ecbecabdf..cf8a332174f 100644
--- a/examples/gno.land/r/demo/boards/z_10_b_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_10_b_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"strconv"
diff --git a/examples/gno.land/r/demo/boards/z_11_a_filetest.gno b/examples/gno.land/r/demo/boards/z_11_a_filetest.gno
index 50bcfac355c..d7dc7b90782 100644
--- a/examples/gno.land/r/demo/boards/z_11_a_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_11_a_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"strconv"
diff --git a/examples/gno.land/r/demo/boards/z_11_b_filetest.gno b/examples/gno.land/r/demo/boards/z_11_b_filetest.gno
index 9a067f5aac5..3aa28095502 100644
--- a/examples/gno.land/r/demo/boards/z_11_b_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_11_b_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"strconv"
diff --git a/examples/gno.land/r/demo/boards/z_11_c_filetest.gno b/examples/gno.land/r/demo/boards/z_11_c_filetest.gno
index 524b626ff6d..df764303562 100644
--- a/examples/gno.land/r/demo/boards/z_11_c_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_11_c_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"strconv"
diff --git a/examples/gno.land/r/demo/boards/z_11_d_filetest.gno b/examples/gno.land/r/demo/boards/z_11_d_filetest.gno
index 33e6ca1eea9..c114e769ab1 100644
--- a/examples/gno.land/r/demo/boards/z_11_d_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_11_d_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"strconv"
diff --git a/examples/gno.land/r/demo/boards/z_11_filetest.gno b/examples/gno.land/r/demo/boards/z_11_filetest.gno
index 9e85b8ace8c..4cbdeeca4c3 100644
--- a/examples/gno.land/r/demo/boards/z_11_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_11_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"strconv"
diff --git a/examples/gno.land/r/demo/boards/z_5_b_filetest.gno b/examples/gno.land/r/demo/boards/z_5_b_filetest.gno
index 105c7f19ef7..e79da5c3677 100644
--- a/examples/gno.land/r/demo/boards/z_5_b_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_5_b_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
diff --git a/examples/gno.land/r/demo/boards/z_5_c_filetest.gno b/examples/gno.land/r/demo/boards/z_5_c_filetest.gno
index bb9d7a57010..176b1d89015 100644
--- a/examples/gno.land/r/demo/boards/z_5_c_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_5_c_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
diff --git a/examples/gno.land/r/demo/boards/z_5_d_filetest.gno b/examples/gno.land/r/demo/boards/z_5_d_filetest.gno
index e54ac578dc1..54cfe49eec6 100644
--- a/examples/gno.land/r/demo/boards/z_5_d_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_5_d_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
diff --git a/examples/gno.land/r/demo/boards/z_7_filetest.gno b/examples/gno.land/r/demo/boards/z_7_filetest.gno
index 7a6b4d89eec..f1d41aa1723 100644
--- a/examples/gno.land/r/demo/boards/z_7_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_7_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"gno.land/r/demo/boards"
diff --git a/examples/gno.land/r/demo/boards/z_8_filetest.gno b/examples/gno.land/r/demo/boards/z_8_filetest.gno
index e7f94a78746..18ad64083f4 100644
--- a/examples/gno.land/r/demo/boards/z_8_filetest.gno
+++ b/examples/gno.land/r/demo/boards/z_8_filetest.gno
@@ -1,7 +1,7 @@
 // PKGPATH: gno.land/r/demo/boards_test
 package boards_test
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"strconv"
diff --git a/examples/gno.land/r/demo/groups/z_0_b_filetest.gno b/examples/gno.land/r/demo/groups/z_0_b_filetest.gno
index 49e4167ae1a..6d328825dd6 100644
--- a/examples/gno.land/r/demo/groups/z_0_b_filetest.gno
+++ b/examples/gno.land/r/demo/groups/z_0_b_filetest.gno
@@ -16,4 +16,4 @@ func main() {
 }
 
 // Error:
-// payment must not be less than 200000000
+// payment must not be less than 20000000
diff --git a/examples/gno.land/r/demo/groups/z_1_a_filetest.gno b/examples/gno.land/r/demo/groups/z_1_a_filetest.gno
index 95d13c6f241..aeff9ab7774 100644
--- a/examples/gno.land/r/demo/groups/z_1_a_filetest.gno
+++ b/examples/gno.land/r/demo/groups/z_1_a_filetest.gno
@@ -13,7 +13,7 @@ import (
 
 var gid groups.GroupID
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/groups/z_2_a_filetest.gno b/examples/gno.land/r/demo/groups/z_2_a_filetest.gno
index d9bee0e2edc..d1cc53d612f 100644
--- a/examples/gno.land/r/demo/groups/z_2_a_filetest.gno
+++ b/examples/gno.land/r/demo/groups/z_2_a_filetest.gno
@@ -13,7 +13,7 @@ import (
 
 var gid groups.GroupID
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/preregister.gno b/examples/gno.land/r/demo/users/preregister.gno
new file mode 100644
index 00000000000..a6377c54938
--- /dev/null
+++ b/examples/gno.land/r/demo/users/preregister.gno
@@ -0,0 +1,66 @@
+package users
+
+import (
+	"std"
+
+	"gno.land/p/demo/users"
+)
+
+// pre-restricted names
+var preRestrictedNames = []string{
+	"bitcoin", "cosmos", "newtendermint", "ethereum",
+}
+
+// pre-registered users
+var preRegisteredUsers = []struct {
+	Name    string
+	Address std.Address
+}{
+	// system name
+	{"archives", "g1xlnyjrnf03ju82v0f98ruhpgnquk28knmjfe5k"}, // -> @r_archives
+	{"demo", "g13ek2zz9qurzynzvssyc4sthwppnruhnp0gdz8n"},     // -> @r_demo
+	{"gno", "g19602kd9tfxrfd60sgreadt9zvdyyuudcyxsz8a"},      // -> @r_gno
+	{"gnoland", "g1g3lsfxhvaqgdv4ccemwpnms4fv6t3aq3p5z6u7"},  // -> @r_gnoland
+	{"gnolang", "g1yjlnm3z2630gg5mryjd79907e0zx658wxs9hnd"},  // -> @r_gnolang
+	{"gov", "g1g73v2anukg4ej7axwqpthsatzrxjsh0wk797da"},      // -> @r_gov
+	{"nt", "g15ge0ae9077eh40erwrn2eq0xw6wupwqthpv34l"},       // -> @r_nt
+	{"sys", "g1r929wt2qplfawe4lvqv9zuwfdcz4vxdun7qh8l"},      // -> @r_sys
+	{"x", "g164sdpew3c2t3rvxj3kmfv7c7ujlvcw2punzzuz"},        // -> @r_x
+}
+
+func init() {
+	// add pre-registered users
+	for _, res := range preRegisteredUsers {
+		// assert not already registered.
+		_, ok := name2User.Get(res.Name)
+		if ok {
+			panic("name already registered")
+		}
+
+		_, ok = addr2User.Get(res.Address.String())
+		if ok {
+			panic("address already registered")
+		}
+
+		counter++
+		user := &users.User{
+			Address: res.Address,
+			Name:    res.Name,
+			Profile: "",
+			Number:  counter,
+			Invites: int(0),
+			Inviter: admin,
+		}
+		name2User.Set(res.Name, user)
+		addr2User.Set(res.Address.String(), user)
+	}
+
+	// add pre-restricted names
+	for _, name := range preRestrictedNames {
+		if _, ok := name2User.Get(name); ok {
+			panic("name already registered")
+		}
+
+		restricted.Set(name, true)
+	}
+}
diff --git a/examples/gno.land/r/demo/users/users.gno b/examples/gno.land/r/demo/users/users.gno
index 5b4b8ec2c14..9b8e93b579b 100644
--- a/examples/gno.land/r/demo/users/users.gno
+++ b/examples/gno.land/r/demo/users/users.gno
@@ -14,13 +14,15 @@ import (
 // State
 
 var (
-	admin      std.Address = "g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj"
-	name2User  avl.Tree                    // Name -> *users.User
-	addr2User  avl.Tree                    // std.Address -> *users.User
-	invites    avl.Tree                    // string(inviter+":"+invited) -> true
-	counter    int                         // user id counter
-	minFee     int64       = 200 * 1000000 // minimum gnot must be paid to register.
-	maxFeeMult int64       = 10            // maximum multiples of minFee accepted.
+	admin std.Address = "g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq" // @moul
+
+	restricted avl.Tree                  // Name -> true - restricted name
+	name2User  avl.Tree                  // Name -> *users.User
+	addr2User  avl.Tree                  // std.Address -> *users.User
+	invites    avl.Tree                  // string(inviter+":"+invited) -> true
+	counter    int                       // user id counter
+	minFee     int64    = 20 * 1_000_000 // minimum gnot must be paid to register.
+	maxFeeMult int64    = 10             // maximum multiples of minFee accepted.
 )
 
 //----------------------------------------
@@ -34,8 +36,10 @@ func Register(inviter std.Address, name string, profile string) {
 	if caller != std.GetOrigCaller() {
 		panic("should not happen") // because std.AssertOrigCall().
 	}
+
 	sentCoins := std.GetOrigSend()
 	minCoin := std.NewCoin("ugnot", minFee)
+
 	if inviter == "" {
 		// banker := std.GetBanker(std.BankerTypeOrigSend)
 		if len(sentCoins) == 1 && sentCoins[0].IsGTE(minCoin) {
@@ -55,19 +59,35 @@ func Register(inviter std.Address, name string, profile string) {
 		}
 		invites.Remove(invitekey)
 	}
+
 	// assert not already registered.
 	_, ok := name2User.Get(name)
 	if ok {
-		panic("name already registered")
+		panic("name already registered: " + name)
 	}
 	_, ok = addr2User.Get(caller.String())
 	if ok {
-		panic("address already registered")
+		panic("address already registered: " + caller.String())
+	}
+
+	isInviterAdmin := inviter == admin
+
+	// check for restricted name
+	if _, isRestricted := restricted.Get(name); isRestricted {
+		// only address invite by the admin can register restricted name
+		if !isInviterAdmin {
+			panic("restricted name: " + name)
+		}
+
+		restricted.Remove(name)
 	}
+
 	// assert name is valid.
-	if !reName.MatchString(name) {
+	// admin inviter can bypass name restriction
+	if !isInviterAdmin && !reName.MatchString(name) {
 		panic("invalid name: " + name + " (must be at least 6 characters, lowercase alphanumeric with underscore)")
 	}
+
 	// remainder of fees go toward invites.
 	invites := int(0)
 	if len(sentCoins) == 1 {
@@ -240,10 +260,31 @@ func Resolve(input users.AddressOrName) std.Address {
 	if !isName {
 		return std.Address(input) // TODO check validity
 	}
+
 	user := GetUserByName(name)
 	return user.Address
 }
 
+// Add restricted name to the list
+func AdminAddRestrictedName(name string) {
+	// assert CallTx call.
+	std.AssertOriginCall()
+	// get caller
+	caller := std.GetOrigCaller()
+	// assert admin
+	if caller != admin {
+		panic("unauthorized")
+	}
+
+	if user := GetUserByName(name); user != nil {
+		panic("already registered name")
+	}
+
+	// register restricted name
+
+	restricted.Set(name, true)
+}
+
 //----------------------------------------
 // Constants
 
diff --git a/examples/gno.land/r/demo/users/z_0_b_filetest.gno b/examples/gno.land/r/demo/users/z_0_b_filetest.gno
index 9095057076c..c33edc32985 100644
--- a/examples/gno.land/r/demo/users/z_0_b_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_0_b_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 199000000ugnot
+// SEND: 19900000ugnot
 
 import (
 	"gno.land/r/demo/users"
@@ -12,4 +12,4 @@ func main() {
 }
 
 // Error:
-// payment must not be less than 200000000
+// payment must not be less than 20000000
diff --git a/examples/gno.land/r/demo/users/z_10_filetest.gno b/examples/gno.land/r/demo/users/z_10_filetest.gno
index 878fa296fdd..078058c0703 100644
--- a/examples/gno.land/r/demo/users/z_10_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_10_filetest.gno
@@ -8,7 +8,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func init() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/z_11_filetest.gno b/examples/gno.land/r/demo/users/z_11_filetest.gno
new file mode 100644
index 00000000000..603d63f371d
--- /dev/null
+++ b/examples/gno.land/r/demo/users/z_11_filetest.gno
@@ -0,0 +1,25 @@
+package main
+
+// SEND: 200000000ugnot
+
+import (
+	"std"
+
+	"gno.land/r/demo/users"
+)
+
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
+
+func main() {
+	caller := std.GetOrigCaller() // main
+	std.TestSetOrigCaller(admin)
+	users.AdminAddRestrictedName("superrestricted")
+
+	// test restricted name
+	std.TestSetOrigCaller(caller)
+	users.Register("", "superrestricted", "my profile")
+	println("done")
+}
+
+// Error:
+// restricted name: superrestricted
diff --git a/examples/gno.land/r/demo/users/z_11b_filetest.gno b/examples/gno.land/r/demo/users/z_11b_filetest.gno
new file mode 100644
index 00000000000..5e661e8f8c1
--- /dev/null
+++ b/examples/gno.land/r/demo/users/z_11b_filetest.gno
@@ -0,0 +1,28 @@
+package main
+
+// SEND: 200000000ugnot
+
+import (
+	"std"
+
+	"gno.land/r/demo/users"
+)
+
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
+
+func main() {
+	caller := std.GetOrigCaller() // main
+	std.TestSetOrigCaller(admin)
+	// add restricted name
+	users.AdminAddRestrictedName("superrestricted")
+	// grant invite to caller
+	users.Invite(caller.String())
+	// set back caller
+	std.TestSetOrigCaller(caller)
+	// register restricted name with admin invite
+	users.Register(admin, "superrestricted", "my profile")
+	println("done")
+}
+
+// Output:
+// done
diff --git a/examples/gno.land/r/demo/users/z_1_filetest.gno b/examples/gno.land/r/demo/users/z_1_filetest.gno
index a1c7e682022..504a0c7c3f9 100644
--- a/examples/gno.land/r/demo/users/z_1_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_1_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"gno.land/r/demo/users"
diff --git a/examples/gno.land/r/demo/users/z_2_filetest.gno b/examples/gno.land/r/demo/users/z_2_filetest.gno
index a99e8fd12ee..84b62a7e483 100644
--- a/examples/gno.land/r/demo/users/z_2_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_2_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
@@ -9,7 +9,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/z_3_filetest.gno b/examples/gno.land/r/demo/users/z_3_filetest.gno
index 1cd3886152a..ce34c6bba66 100644
--- a/examples/gno.land/r/demo/users/z_3_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_3_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
@@ -9,7 +9,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/z_4_filetest.gno b/examples/gno.land/r/demo/users/z_4_filetest.gno
index 51bd255e3e7..1a46d915c96 100644
--- a/examples/gno.land/r/demo/users/z_4_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_4_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
@@ -9,7 +9,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/z_5_filetest.gno b/examples/gno.land/r/demo/users/z_5_filetest.gno
index 5a96eec5322..4ab68ec0e0b 100644
--- a/examples/gno.land/r/demo/users/z_5_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_5_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
@@ -9,7 +9,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
@@ -36,8 +36,17 @@ func main() {
 }
 
 // Output:
-// * [gnouser](/r/demo/users:gnouser)
+// * [archives](/r/demo/users:archives)
+//  * [demo](/r/demo/users:demo)
+//  * [gno](/r/demo/users:gno)
+//  * [gnoland](/r/demo/users:gnoland)
+//  * [gnolang](/r/demo/users:gnolang)
+//  * [gnouser](/r/demo/users:gnouser)
+//  * [gov](/r/demo/users:gov)
+//  * [nt](/r/demo/users:nt)
 //  * [satoshi](/r/demo/users:satoshi)
+//  * [sys](/r/demo/users:sys)
+//  * [x](/r/demo/users:x)
 //
 // ========================================
 // ## user gnouser
diff --git a/examples/gno.land/r/demo/users/z_6_filetest.gno b/examples/gno.land/r/demo/users/z_6_filetest.gno
index 008ba03a936..85305fff1ad 100644
--- a/examples/gno.land/r/demo/users/z_6_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_6_filetest.gno
@@ -6,7 +6,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller()
diff --git a/examples/gno.land/r/demo/users/z_7_filetest.gno b/examples/gno.land/r/demo/users/z_7_filetest.gno
index 60efc3b91ea..3332ab49af4 100644
--- a/examples/gno.land/r/demo/users/z_7_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_7_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
@@ -9,7 +9,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/z_7b_filetest.gno b/examples/gno.land/r/demo/users/z_7b_filetest.gno
index 81f1076b3d1..60a397abe79 100644
--- a/examples/gno.land/r/demo/users/z_7b_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_7b_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
@@ -9,7 +9,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/z_8_filetest.gno b/examples/gno.land/r/demo/users/z_8_filetest.gno
index 56c13862257..1eaa017b7d2 100644
--- a/examples/gno.land/r/demo/users/z_8_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_8_filetest.gno
@@ -1,6 +1,6 @@
 package main
 
-// SEND: 2000000000ugnot
+// SEND: 200000000ugnot
 
 import (
 	"std"
@@ -9,7 +9,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/demo/users/z_9_filetest.gno b/examples/gno.land/r/demo/users/z_9_filetest.gno
index e77a68d7ff9..2bd9bf555dc 100644
--- a/examples/gno.land/r/demo/users/z_9_filetest.gno
+++ b/examples/gno.land/r/demo/users/z_9_filetest.gno
@@ -7,7 +7,7 @@ import (
 	"gno.land/r/demo/users"
 )
 
-const admin = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
+const admin = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
 
 func main() {
 	caller := std.GetOrigCaller() // main
diff --git a/examples/gno.land/r/sys/names/genesis.gno b/examples/gno.land/r/sys/names/genesis.gno
deleted file mode 100644
index 7e4ae51645f..00000000000
--- a/examples/gno.land/r/sys/names/genesis.gno
+++ /dev/null
@@ -1,30 +0,0 @@
-package names
-
-import "std"
-
-func init() {
-	// Please, do not edit this file to reserve your username, use a transaction instead.
-	var (
-		jaekwon       = std.Address("g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj")
-		manfred       = std.Address("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq")
-		test1         = std.Address("g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5")
-		reservedAdmin = std.Address("g100000000000000000000000000000000000000") // FIXME: create a multisig.
-		reservedNames = []string{
-			// FIXME: complete this list.
-			"gno", "gnolang", "tendermint", "cosmos", "hub", "admin",
-			"ethereum", "bitcoin",
-			// FIXME: reserve brands? then, require KYC to unlock?
-		}
-	)
-	namespaces.Set("demo", &Space{Admins: []std.Address{jaekwon, manfred}})
-	namespaces.Set("gnoland", &Space{Admins: []std.Address{jaekwon, manfred}})
-	namespaces.Set("sys", &Space{Admins: []std.Address{jaekwon, manfred}})
-	namespaces.Set("gov", &Space{Admins: []std.Address{jaekwon, manfred}})
-	namespaces.Set("jaekwon", &Space{Admins: []std.Address{jaekwon}})
-	namespaces.Set("manfred", &Space{Admins: []std.Address{manfred}})
-	namespaces.Set("test1", &Space{Admins: []std.Address{test1}})
-
-	for _, keyword := range reservedNames {
-		namespaces.Set(keyword, &Space{Admins: []std.Address{reservedAdmin}})
-	}
-}
diff --git a/examples/gno.land/r/sys/names/gno.mod b/examples/gno.land/r/sys/names/gno.mod
deleted file mode 100644
index 97236a84892..00000000000
--- a/examples/gno.land/r/sys/names/gno.mod
+++ /dev/null
@@ -1,3 +0,0 @@
-module gno.land/r/sys/names
-
-require gno.land/p/demo/avl v0.0.0-latest
diff --git a/examples/gno.land/r/sys/names/names.gno b/examples/gno.land/r/sys/names/names.gno
deleted file mode 100644
index d73ec59b2c5..00000000000
--- a/examples/gno.land/r/sys/names/names.gno
+++ /dev/null
@@ -1,60 +0,0 @@
-// The realm r/sys/names is used to manage namespaces on gno.land.
-package names
-
-import (
-	"std"
-
-	"gno.land/p/demo/avl"
-)
-
-// "AddPkg" will check if r/sys/names exists. If yes, it will
-// inspect the realm's state and use the following variable to
-// determine if an address can publish a package or not.
-var namespaces avl.Tree // name(string) -> Space
-
-type Space struct {
-	Admins  []std.Address
-	Editors []std.Address
-	InPause bool
-}
-
-func Register(namespace string) {
-	// TODO: input sanitization:
-	// - already exists / reserved.
-	// - min/max length, format.
-	// - fees (dynamic, based on length).
-	panic("not implemented")
-}
-
-func AddAdmin(namespace string, newAdmin std.Address) {
-	// TODO: assertIsAdmin()
-	panic("not implemented")
-}
-
-func RemoveAdmin(namespace string, newAdmin std.Address) {
-	// TODO: assertIsAdmin()
-	// TODO: check if self.
-	panic("not implemented")
-}
-
-func AddEditor(namespace string, newAdmin std.Address) {
-	// TODO: assertIsAdmin()
-	panic("not implemented")
-}
-
-func RemoveEditor(namespace string, newAdmin std.Address) {
-	// TODO: assertIsAdmin()
-	// TODO: check if self.
-	panic("not implemented")
-}
-
-func SetInPause(namespace string, state bool) {
-	// TODO: assertIsAdmin()
-	panic("not implemented")
-}
-
-func Render(path string) string {
-	// TODO: by namespace.
-	// TODO: by address.
-	return "not implemented"
-}
diff --git a/examples/gno.land/r/sys/users/gno.mod b/examples/gno.land/r/sys/users/gno.mod
new file mode 100644
index 00000000000..774a364a272
--- /dev/null
+++ b/examples/gno.land/r/sys/users/gno.mod
@@ -0,0 +1,6 @@
+module gno.land/r/sys/users
+
+require (
+	gno.land/p/demo/ownable v0.0.0-latest
+	gno.land/r/demo/users v0.0.0-latest
+)
diff --git a/examples/gno.land/r/sys/users/verify.gno b/examples/gno.land/r/sys/users/verify.gno
new file mode 100644
index 00000000000..852626622e4
--- /dev/null
+++ b/examples/gno.land/r/sys/users/verify.gno
@@ -0,0 +1,83 @@
+package users
+
+import (
+	"std"
+
+	"gno.land/p/demo/ownable"
+	"gno.land/r/demo/users"
+)
+
+const admin = "g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq" // @moul
+
+type VerifyNameFunc func(enabled bool, address std.Address, name string) bool
+
+var (
+	owner     = ownable.NewWithAddress(admin) // Package owner
+	checkFunc = VerifyNameByUser              // Checking namespace callback
+	enabled   = false                         // For now this package is disabled by default
+)
+
+func IsEnabled() bool { return enabled }
+
+// This method ensures that the given address has ownership of the given name.
+func IsAuthorizedAddressForName(address std.Address, name string) bool {
+	return checkFunc(enabled, address, name)
+}
+
+// VerifyNameByUser checks from the `users` package that the user has correctly
+// registered the given name.
+// This function considers as valid an `address` that matches the `name`.
+func VerifyNameByUser(enable bool, address std.Address, name string) bool {
+	if !enable {
+		return true
+	}
+
+	// Allow user with their own address as name
+	if address.String() == name {
+		return true
+	}
+
+	if user := users.GetUserByName(name); user != nil {
+		return user.Address == address
+	}
+
+	return false
+}
+
+// Admin calls
+
+// Enable this package.
+func AdminEnable() {
+	if err := owner.CallerIsOwner(); err != nil {
+		panic(err)
+	}
+
+	enabled = true
+}
+
+// Disable this package.
+func AdminDisable() {
+	if err := owner.CallerIsOwner(); err != nil {
+		panic(err)
+	}
+
+	enabled = false
+}
+
+// AdminUpdateVerifyCall updates the method that verifies the namespace.
+func AdminUpdateVerifyCall(check VerifyNameFunc) {
+	if err := owner.CallerIsOwner(); err != nil {
+		panic(err)
+	}
+
+	checkFunc = check
+}
+
+// AdminTransferOwnership transfers the ownership to a new owner.
+func AdminTransferOwnership(newOwner std.Address) error {
+	if err := owner.CallerIsOwner(); err != nil {
+		panic(err)
+	}
+
+	return owner.TransferOwnership(newOwner)
+}
diff --git a/gno.land/cmd/gnoland/testdata/addpkg_namespace.txtar b/gno.land/cmd/gnoland/testdata/addpkg_namespace.txtar
new file mode 100644
index 00000000000..5a88fd6d603
--- /dev/null
+++ b/gno.land/cmd/gnoland/testdata/addpkg_namespace.txtar
@@ -0,0 +1,88 @@
+loadpkg gno.land/r/demo/users
+loadpkg gno.land/r/sys/users
+
+adduser admin
+adduser gui
+
+patchpkg "g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq" $USER_ADDR_admin # use our custom admin
+
+gnoland start
+
+## When `sys/users` is disabled
+
+# Should be disabled by default, addpkg should work by default
+
+# Check if sys/users is disabled
+# gui call -> sys/users.IsEnable
+gnokey maketx call -pkgpath gno.land/r/sys/users -func IsEnabled -gas-fee 100000ugnot -gas-wanted 2000000 -broadcast -chainid tendermint_test gui
+stdout 'OK!'
+stdout 'false'
+
+# Gui should be able to addpkg on test1 addr
+# gui addpkg -> gno.land/r/<addr_test1>/mysuperpkg
+gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/$USER_ADDR_test1/mysuperpkg -gas-fee 1000000ugnot -gas-wanted 100000000 -broadcast -chainid=tendermint_test gui
+stdout 'OK!'
+
+# Gui should be able to addpkg on random name
+# gui addpkg -> gno.land/r/randomname/mysuperpkg
+gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/randomname/mysuperpkg -gas-fee 1000000ugnot -gas-wanted 100000000 -broadcast -chainid=tendermint_test gui
+stdout 'OK!'
+
+## When `sys/users` is enabled
+
+# Enable `sys/users`
+# admin call -> sys/users.AdminEnable
+gnokey maketx call -pkgpath gno.land/r/sys/users -func AdminEnable -gas-fee 100000ugnot -gas-wanted 2000000 -broadcast -chainid tendermint_test admin
+stdout 'OK!'
+
+# Check that `sys/users` has been enabled
+# gui call -> sys/users.IsEnable
+gnokey maketx call -pkgpath gno.land/r/sys/users -func IsEnabled -gas-fee 100000ugnot -gas-wanted 2000000 -broadcast -chainid tendermint_test gui
+stdout 'OK!'
+stdout 'true'
+
+# Try to add a pkg an with unregistered user
+# gui addpkg -> gno.land/r/<addr_test1>/one
+! gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/$USER_ADDR_test1/one -gas-fee 1000000ugnot -gas-wanted 100000000 -broadcast -chainid=tendermint_test gui
+stderr 'unauthorized user'
+
+# Try to add a pkg with an unregistered user, on their own address as namespace
+# gui addpkg -> gno.land/r/<addr_gui>/one
+gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/$USER_ADDR_gui/one -gas-fee 1000000ugnot -gas-wanted 100000000 -broadcast -chainid=tendermint_test gui
+stdout 'OK!'
+
+## Test unregistered namespace
+
+# Call addpkg with admin user on gui namespace
+# admin addpkg -> gno.land/r/guiland/one
+! gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/guiland/one -gas-fee 1000000ugnot -gas-wanted 100000000 -broadcast -chainid=tendermint_test admin
+stderr 'unauthorized user'
+
+## Test registered namespace
+
+# Test admin invites gui
+# admin call -> demo/users.Invite
+gnokey maketx call -pkgpath gno.land/r/demo/users -func Invite -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test -args $USER_ADDR_gui admin
+stdout 'OK!'
+
+# test gui register namespace
+# gui call -> demo/users.Register
+gnokey maketx call -pkgpath gno.land/r/demo/users -func Register -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test -args $USER_ADDR_admin -args 'guiland' -args 'im gui' gui
+stdout 'OK!'
+
+# Test gui publishing on guiland/one
+# gui addpkg -> gno.land/r/guiland/one
+gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/guiland/one -gas-fee 1000000ugnot -gas-wanted 100000000 -broadcast -chainid=tendermint_test gui
+stdout 'OK!'
+
+# Test admin publishing on guiland/two
+# admin addpkg -> gno.land/r/guiland/two
+! gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/guiland/two -gas-fee 1000000ugnot -gas-wanted 100000000 -broadcast -chainid=tendermint_test admin
+stderr 'unauthorized user'
+
+-- one.gno --
+package one
+
+func Render(path string) string {
+	return "# Hello One"
+}
diff --git a/gno.land/genesis/genesis_txs.jsonl b/gno.land/genesis/genesis_txs.jsonl
index 278055711b0..daf9fbdc5d4 100644
--- a/gno.land/genesis/genesis_txs.jsonl
+++ b/gno.land/genesis/genesis_txs.jsonl
@@ -1,12 +1,12 @@
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+{"msg":[{"@type":"/vm.m_call","caller":"g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq","send":"","pkg_path":"gno.land/r/demo/users","func":"Invite","args":["g1589c8cekvmjfmy0qrd4f3z52r7fn7rgk02667s\ng13sm84nuqed3fuank8huh7x9mupgw22uft3lcl8\ng1m6732pkrngu9vrt0g7056lvr9kcqc4mv83xl5q\ng1wg88rhzlwxjd2z4j5de5v5xq30dcf6rjq3dhsj\ng18pmaskasz7mxj6rmgrl3al58xu45a7w0l5nmc0\ng19wwhkmqlns70604ksp6rkuuu42qhtvyh05lffz\ng187982000zsc493znqt828s90cmp6hcp2erhu6m\ng1ndpsnrspdnauckytvkfv8s823t3gmpqmtky8pl\ng16ja66d65emkr0zxd2tu7xjvm7utthyhpej0037\ng1ds24jj9kqjcskd0gzu24r9e4n62ggye230zuv5\ng1trkzq75ntamsnw9xnrav2v7gy2lt5g6p29yhdr\ng1rrf8s5mrmu00sx04fzfsvc399fklpeg2x0a7mz\ng19p5ntfvpt4lwq4jqsmnxsnelhf3tff9scy3w8w\ng1tue8l73d6rq4vhqdsp2sr3zhuzpure3k2rnwpz\ng14hhsss4ngx5kq77je5g0tl4vftg8qp45ceadk3\ng1768hvkh7anhd40ch4h7jdh6j3mpcs7hrat4gl0\ng15fa8kyjhu88t9dr8zzua8fwdvkngv5n8yqsm0n\ng1xhccdjcscuhgmt3quww6qdy3j3czqt3urc2eac\ng1z629z04f85k4t5gnkk5egpxw9tqxeec435esap\ng1pfldkplz9puq0v82lu9vqcve9nwrxuq9qe5ttv\ng152pn0g5qfgxr7yx8zlwjq48hytkafd8x7egsfv\ng1cf2ye686ke38vjyqakreprljum4xu6rwf5jskq\ng1c5shztyaj4gjrc5zlwmh9xhex5w7l4asffs2w6\ng1lhpx2ktk0ha3qw42raxq4m24a4c4xqxyrgv54q\ng1026p54q0j902059sm2zsv37krf0ghcl7gmhyv7\ng1n4yvwnv77frq2ccuw27dmtjkd7u4p4jg0pgm7k\ng13m7f2e6r3lh3ykxupacdt9sem2tlvmaamwjhll\ng19uxluuecjlsqvwmwu8sp6pxaaqfhk972q975xd\ng1j80fpcsumfkxypvydvtwtz3j4sdwr8c2u0lr64\ng1tjdpptuk9eysq6z38nscqyycr998xjyx3w8jvw\ng19t3n89slfemgd3mwuat4lajwcp0yxrkadgeg7a\ng1yqndt8xx92l9h494jfruz2w79swzjes3n4wqjc\ng13278z0a5ufeg80ffqxpda9dlp599t7ekregcy6\ng1ht236wjd83x96uqwh9rh3fq6pylyn78mtwq9v6\ng1fj9jccm3zjnqspq7lp2g7lj4czyfq0s35600g9\ng1wwppuzdns5u6c6jqpkzua24zh6ppsus6399cea\ng1k8pjnguyu36pkc8hy0ufzgpzfmj2jl78la7ek3\ng1e8umkzumtxgs8399lw0us4rclea3xl5gxy9spp\ng14qekdkj2nmmwea4ufg9n002a3pud23y8k7ugs5\ng19w2488ntfgpduzqq3sk4j5x387zynwknqdvjqf\ng1495y3z7zrej4rendysnw5kaeu4g3d7x7w0734g\ng1hygx8ga9qakhkczyrzs9drm8j8tu4qds9y5e3r\ng1f977l6wxdh3qu60kzl75vx2wmzswu68l03r8su\ng1644qje5rx6jsdqfkzmgnfcegx4dxkjh6rwqd69\ng1mzjajymvmtksdwh3wkrndwj6zls2awl9q83dh6\ng1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq\ng14da4n9hcynyzz83q607uu8keuh9hwlv42ra6fa\ng14vhcdsyf83ngsrrqc92kmw8q9xakqjm0v8448t\n"]}],"fee":{"gas_wanted":"4000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"AmG6kzznyo1uNqWPAYU6wDpsmzQKDaEOrVRaZ08vOyX0"},"signature":"7AmlhZhsVkxCUl0bbpvpPMnIKihwtG7A5IFR6Tg4xStWLgaUr05XmWRKlO2xjstTtwbVKQT5mFL4h5wyX4SQzw=="}],"memo":""}
+{"msg":[{"@type":"/vm.m_call","caller":"g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj","send":"200000000ugnot","pkg_path":"gno.land/r/demo/users","func":"Register","args":["","administrator","g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"AmG6kzznyo1uNqWPAYU6wDpsmzQKDaEOrVRaZ08vOyX0"},"signature":"AqCqe0cS55Ym7/BvPDoCDyPP5q8284gecVQ2PMOlq/4lJpO9Q18SOWKI15dMEBY1pT0AYyhCeTirlsM1I3Y4Cg=="}],"memo":""}
+{"msg":[{"@type":"/vm.m_call","caller":"g1qpymzwx4l4cy6cerdyajp9ksvjsf20rk5y9rtt","send":"200000000ugnot","pkg_path":"gno.land/r/demo/users","func":"Register","args":["","zo_oma","Love is the encryption  key\u003c3"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"A6yg5/iiktruezVw5vZJwLlGwyrvw8RlqOToTRMWXkE2"},"signature":"GGp+bVL2eEvKecPqgcULSABYOSnSMnJzfIsR8ZIRER1GGX/fOiCReX4WKMrGLVROJVfbLQkDRwvhS4TLHlSoSQ=="}],"memo":""}
+{"msg":[{"@type":"/vm.m_call","caller":"g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq","send":"200000000ugnot","pkg_path":"gno.land/r/demo/users","func":"Register","args":["","manfred","https://github.com/moul"]}],"fee":{"gas_wanted":"2000000","gas_fee":"200000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"AnK+a6mcFDjY6b/v6p7r8QFW1M1PgIoQxBgrwOoyY7v3"},"signature":"9CWeNbKx+hEL+RdHplAVAFntcrAVx5mK9tMqoywuHVoreH844n3yOxddQrGfBk6T2tMBmNWakERRqWZfS+bYAQ=="}],"memo":""}
+{"msg":[{"@type":"/vm.m_call","caller":"g1fj9jccm3zjnqspq7lp2g7lj4czyfq0s35600g9","send":"200000000ugnot","pkg_path":"gno.land/r/demo/users","func":"Register","args":["","piupiu","@piux2"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"Ar68lqbU2YC63fbMcYUtJhYO3/66APM/EqF7m0nUjGyz"},"signature":"pTUpP0d/XlfVe3TH1hlaoLhKadzIKG1gtQ/Ueuat72p+659RWRea58Z0mk6GgPE/EeTbhMEY45zufevBdGJVoQ=="}],"memo":""}
+{"msg":[{"@type":"/vm.m_call","caller":"g1ds24jj9kqjcskd0gzu24r9e4n62ggye230zuv5","send":"","pkg_path":"gno.land/r/demo/users","func":"Register","args":["g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq","anarcher","https://twitter.com/anarcher"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"AjpLbKdQeH+yB/1OCB148l5GlRRrXma71hdA8EES3H7f"},"signature":"pf5xm8oWIQIOEwSGw4icPmynLXb1P1HxKfjeh8UStU1mlIBPKa7yppeIMPpAflC0o2zjFR7Axe7CimAebm3BHg=="}],"memo":""}
+{"msg":[{"@type":"/vm.m_call","caller":"g15gdm49ktawvkrl88jadqpucng37yxutucuwaef","send":"200000000ugnot","pkg_path":"gno.land/r/demo/users","func":"Register","args":["","ideamour","\u003c3"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"AhClx4AsDuX3DNCPxhDwWnrfd4MIZmxJE4vt47ClVvT2"},"signature":"IQe64af878k6HjLDqIJeg27GXAVF6xS+96cDe2jMlxNV6+8sOcuUctp0GiWVnYfN4tpthC6d4WhBo+VlpHqkbg=="}],"memo":""}
 {"msg":[{"@type":"/vm.m_call","caller":"g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj","send":"","pkg_path":"gno.land/r/demo/boards","func":"CreateBoard","args":["testboard"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"A+FhNtsXHjLfSJk1lB8FbiL4mGPjc50Kt81J7EKDnJ2y"},"signature":"vzlSxEFh5jOkaSdv3rsV91v/OJKEF2qSuoCpri1u5tRWq62T7xr3KHRCF5qFnn4aQX/yE8g8f/Y//WPOCUGhJw=="}],"memo":""}
 {"msg":[{"@type":"/vm.m_call","caller":"g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj","send":"","pkg_path":"gno.land/r/demo/boards","func":"CreateThread","args":["1","Hello World","This is a demo of Gno smart contract programming.  This document was\nconstructed by Gno onto a smart contract hosted on the data Realm \nname [\"gno.land/r/demo/boards\"](https://gno.land/r/demo/boards/)\n([github](https://github.com/gnolang/gno/tree/master/examples/gno.land/r/demo/boards)).\n\n## Starting the `gnoland` node node/validator.\n\nNOTE: Where you see `--remote %%REMOTE%%` here, that flag can be replaced\nwith `--remote localhost:26657` for local testnets.\n\n### build gnoland.\n\n```bash\ngit clone git@github.com:gnolang/gno.git\ncd ./gno\nmake \n```\n\n### add test account.\n\n```bash\n./build/gnokey add test1 --recover\n```\n\nUse this mnemonic:\n\u003e source bonus chronic canvas draft south burst lottery vacant surface solve popular case indicate oppose farm nothing bullet exhibit title speed wink action roast\n\n### start gnoland validator node.\n\n```bash\n./build/gnoland\n```\n\n(This can be reset with `make reset`).\n\n### start gnoland web server (optional).\n\n```bash\ngo run ./gnoland/website\n```\n\n## Signing and broadcasting transactions.\n\n### publish the \"gno.land/p/demo/avl\" package.\n\n```bash\n./build/gnokey maketx addpkg test1 --pkgpath \"gno.land/p/demo/avl\" --pkgdir \"examples/gno.land/p/demo/avl\" --deposit 100ugnot --gas-fee 1ugnot --gas-wanted 2000000 \u003e addpkg.avl.unsigned.txt\n./build/gnokey query \"auth/accounts/g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5\"\n./build/gnokey sign test1 --txpath addpkg.avl.unsigned.txt --chainid \"%%CHAINID%%\" --number 0 --sequence 0 \u003e addpkg.avl.signed.txt\n./build/gnokey broadcast addpkg.avl.signed.txt --remote %%REMOTE%%\n```\n\n### publish the \"gno.land/r/demo/boards\" realm package.\n\n```bash\n./build/gnokey maketx addpkg test1 --pkgpath \"gno.land/r/demo/boards\" --pkgdir \"examples/gno.land/r/demo/boards\" --deposit 100ugnot --gas-fee 1ugnot --gas-wanted 300000000 \u003e addpkg.boards.unsigned.txt\n./build/gnokey sign test1 --txpath addpkg.boards.unsigned.txt --chainid \"%%CHAINID%%\" --number 0 --sequence 1 \u003e addpkg.boards.signed.txt\n./build/gnokey broadcast addpkg.boards.signed.txt --remote %%REMOTE%%\n```\n\n### create a board with a smart contract call.\n\n```bash\n./build/gnokey maketx call test1 --pkgpath \"gno.land/r/demo/boards\" --func CreateBoard --args \"testboard\" --gas-fee 1ugnot --gas-wanted 2000000 \u003e createboard.unsigned.txt\n./build/gnokey sign test1 --txpath createboard.unsigned.txt --chainid \"%%CHAINID%%\" --number 0 --sequence 2 \u003e createboard.signed.txt\n./build/gnokey broadcast createboard.signed.txt --remote %%REMOTE%%\n```\nNext, query for the permanent board ID by querying (you need this to create a new post):\n\n```bash\n./build/gnokey query \"vm/qeval\" --data \"gno.land/r/demo/boards.GetBoardIDFromName(\\\"testboard\\\")\"\n```\n\n### create a post of a board with a smart contract call.\n\n```bash\n./build/gnokey maketx call test1 --pkgpath \"gno.land/r/demo/boards\" --func CreatePost --args 1 --args \"Hello World\" --args#file \"./examples/gno.land/r/demo/boards/README.md\" --gas-fee 1ugnot --gas-wanted 2000000 \u003e createpost.unsigned.txt\n./build/gnokey sign test1 --txpath createpost.unsigned.txt --chainid \"%%CHAINID%%\" --number 0 --sequence 3 \u003e createpost.signed.txt\n./build/gnokey broadcast createpost.signed.txt --remote %%REMOTE%%\n```\n\n### create a comment to a post.\n\n```bash\n./build/gnokey maketx call test1 --pkgpath \"gno.land/r/demo/boards\" --func CreateReply --args 1 --args 1 --args \"A comment\" --gas-fee 1ugnot --gas-wanted 2000000 \u003e createcomment.unsigned.txt\n./build/gnokey sign test1 --txpath createcomment.unsigned.txt --chainid \"%%CHAINID%%\" --number 0 --sequence 4 \u003e createcomment.signed.txt\n./build/gnokey broadcast createcomment.signed.txt --remote %%REMOTE%%\n```\n\n```bash\n./build/gnokey query \"vm/qrender\" --data \"gno.land/r/demo/boards:testboard/1\"\n```\n\n### render page with optional path expression.\n\nThe contents of `https://gno.land/r/demo/boards:` and `https://gno.land/r/demo/boards:testboard` are rendered by calling\nthe `Render(path string)` function like so:\n\n```bash\n./build/gnokey query \"vm/qrender\" --data \"gno.land/r/demo/boards:testboard\"\n```\n"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"A+FhNtsXHjLfSJk1lB8FbiL4mGPjc50Kt81J7EKDnJ2y"},"signature":"V43B1waFxhzheW9TfmCpjLdrC4dC1yjUGES5y3J6QsNar6hRpNz4G1thzWmWK7xXhg8u1PCIpxLxGczKQYhuPw=="}],"memo":""}
 {"msg":[{"@type":"/vm.m_call","caller":"g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj","send":"","pkg_path":"gno.land/r/demo/boards","func":"CreateThread","args":["1","NFT example","NFT's are all the rage these days, for various reasons.\n\nI read over EIP-721 which appears to be the de-facto NFT standard on Ethereum. Then, made a sample implementation of EIP-721 (let's here called GRC-721). The implementation isn't complete, but it demonstrates the main functionality.\n\n - [EIP-721](https://eips.ethereum.org/EIPS/eip-721)\n - [gno.land/r/demo/nft/nft.gno](https://gno.land/r/demo/nft/nft.gno)\n - [zrealm_nft3.gno test](https://github.com/gnolang/gno/blob/master/examples/gno.land/r/demo/nft/z_3_filetest.gno)\n\nIn short, this demonstrates how to implement Ethereum contract interfaces in gno.land; by using only standard Go language features.\n\nPlease leave a comment ([guide](https://gno.land/r/demo/boards:testboard/1)).\n"]}],"fee":{"gas_wanted":"2000000","gas_fee":"1000000ugnot"},"signatures":[{"pub_key":{"@type":"/tm.PubKeySecp256k1","value":"A+FhNtsXHjLfSJk1lB8FbiL4mGPjc50Kt81J7EKDnJ2y"},"signature":"ZXfrTiHxPFQL8uSm+Tv7WXIHPMca9okhm94RAlC6YgNbB1VHQYYpoP4w+cnL3YskVzGrOZxensXa9CAZ+cNNeg=="}],"memo":""}
diff --git a/gno.land/pkg/gnoweb/gnoweb_test.go b/gno.land/pkg/gnoweb/gnoweb_test.go
index d6b93b37d69..b266dc80a6a 100644
--- a/gno.land/pkg/gnoweb/gnoweb_test.go
+++ b/gno.land/pkg/gnoweb/gnoweb_test.go
@@ -49,7 +49,9 @@ func TestRoutes(t *testing.T) {
 		{"/p/demo/flow/LICENSE", ok, "BSD 3-Clause"},
 	}
 
-	config, _ := integration.TestingNodeConfig(t, gnoenv.RootDir())
+	rootdir := gnoenv.RootDir()
+	genesis := integration.LoadDefaultGenesisTXsFile(t, "tendermint_test", rootdir)
+	config, _ := integration.TestingNodeConfig(t, rootdir, genesis...)
 	node, remoteAddr := integration.TestingInMemoryNode(t, log.NewTestingLogger(t), config)
 	defer node.Stop()
 
@@ -96,7 +98,9 @@ func TestAnalytics(t *testing.T) {
 		"/404-not-found",
 	}
 
-	config, _ := integration.TestingNodeConfig(t, gnoenv.RootDir())
+	rootdir := gnoenv.RootDir()
+	genesis := integration.LoadDefaultGenesisTXsFile(t, "tendermint_test", rootdir)
+	config, _ := integration.TestingNodeConfig(t, rootdir, genesis...)
 	node, remoteAddr := integration.TestingInMemoryNode(t, log.NewTestingLogger(t), config)
 	defer node.Stop()
 
diff --git a/gno.land/pkg/integration/doc.go b/gno.land/pkg/integration/doc.go
index bea0fe78349..2b6d24c23b8 100644
--- a/gno.land/pkg/integration/doc.go
+++ b/gno.land/pkg/integration/doc.go
@@ -45,6 +45,12 @@
 //   - It's important to note that the load order is significant when using multiple `loadpkg`
 //     command; packages should be loaded in the order they are dependent upon.
 //
+// 6. `patchpkg`:
+//   - Patches any loaded files by package by replacing all occurrences of the first argument with the second.
+//   - This is mostly used to replace hardcoded addresses from loaded packages.
+//   - NOTE: this command may only be temporary, as it's not best approach to
+//     solve the above problem
+//
 // Logging:
 //
 // Gnoland logs aren't forwarded to stdout to avoid overwhelming the tests with too much
diff --git a/gno.land/pkg/integration/testdata/patchpkg.txtar b/gno.land/pkg/integration/testdata/patchpkg.txtar
new file mode 100644
index 00000000000..c5962709625
--- /dev/null
+++ b/gno.land/pkg/integration/testdata/patchpkg.txtar
@@ -0,0 +1,20 @@
+loadpkg gno.land/r/dev/admin $WORK
+
+adduser dev
+
+patchpkg "g1abcde" $USER_ADDR_dev
+
+gnoland start
+
+gnokey maketx call -pkgpath gno.land/r/dev/admin -func Render -gas-fee 1000000ugnot -gas-wanted 2000000 -args '' -broadcast -chainid=tendermint_test test1
+! stdout g1abcde
+stdout $USER_ADDR_dev
+
+-- admin.gno --
+package admin
+
+var admin = "g1abcde"
+
+func Render(path string) string {
+	return "# Hello "+admin
+}
diff --git a/gno.land/pkg/integration/testing_integration.go b/gno.land/pkg/integration/testing_integration.go
index 654dda0b45e..0462b0c7639 100644
--- a/gno.land/pkg/integration/testing_integration.go
+++ b/gno.land/pkg/integration/testing_integration.go
@@ -15,6 +15,7 @@ import (
 	"github.com/gnolang/gno/gno.land/pkg/gnoland"
 	"github.com/gnolang/gno/gno.land/pkg/keyscli"
 	"github.com/gnolang/gno/gno.land/pkg/log"
+	"github.com/gnolang/gno/gno.land/pkg/sdk/vm"
 	"github.com/gnolang/gno/gnovm/pkg/gnoenv"
 	"github.com/gnolang/gno/gnovm/pkg/gnomod"
 	"github.com/gnolang/gno/tm2/pkg/bft/node"
@@ -259,7 +260,7 @@ func setupGnolandTestScript(t *testing.T, txtarDir string) testscript.Params {
 				err = cmd.ParseAndRun(context.Background(), args)
 				tsValidateError(ts, "gnokey", neg, err)
 			},
-			// adduser commands must be executed before starting the node; it errors out otherwise.
+			// adduser command must be executed before starting the node; it errors out otherwise.
 			"adduser": func(ts *testscript.TestScript, neg bool, args []string) {
 				if nodeIsRunning(nodes, getNodeSID(ts)) {
 					tsValidateError(ts, "adduser", neg, errors.New("adduser must be used before starting node"))
@@ -339,7 +340,24 @@ func setupGnolandTestScript(t *testing.T, txtarDir string) testscript.Params {
 
 				fmt.Fprintf(ts.Stdout(), "Added %s(%s) to genesis", args[0], balance.Address)
 			},
-			// `loadpkg` load a specific package from the 'examples' or working directory
+			// `patchpkg` Patch any loaded files by packages by replacing all occurrences of the
+			// first argument with the second.
+			// This is mostly use to replace hardcoded address inside txtar file.
+			"patchpkg": func(ts *testscript.TestScript, neg bool, args []string) {
+				args, err := unquote(args)
+				if err != nil {
+					tsValidateError(ts, "patchpkg", neg, err)
+				}
+
+				if len(args) != 2 {
+					ts.Fatalf("`patchpkg`: should have exactly 2 arguments")
+				}
+
+				pkgs := ts.Value(envKeyPkgsLoader).(*pkgsLoader)
+				replace, with := args[0], args[1]
+				pkgs.SetPatch(replace, with)
+			},
+			// `loadpkg` load a specific package from the 'examples' or working directory.
 			"loadpkg": func(ts *testscript.TestScript, neg bool, args []string) {
 				// special dirs
 				workDir := ts.Getenv("WORK")
@@ -575,12 +593,17 @@ func createAccountFrom(env envSetter, kb keys.Keybase, accountName, mnemonic str
 type pkgsLoader struct {
 	pkgs    []gnomod.Pkg
 	visited map[string]struct{}
+
+	// list of occurrences to patchs with the given value
+	// XXX: find a better way
+	patchs map[string]string
 }
 
 func newPkgsLoader() *pkgsLoader {
 	return &pkgsLoader{
 		pkgs:    make([]gnomod.Pkg, 0),
 		visited: make(map[string]struct{}),
+		patchs:  make(map[string]string),
 	}
 }
 
@@ -588,6 +611,10 @@ func (pl *pkgsLoader) List() gnomod.PkgList {
 	return pl.pkgs
 }
 
+func (pl *pkgsLoader) SetPatch(replace, with string) {
+	pl.patchs[replace] = with
+}
+
 func (pl *pkgsLoader) LoadPackages(creator bft.Address, fee std.Fee, deposit std.Coins) ([]std.Tx, error) {
 	pkgslist, err := pl.List().Sort() // sorts packages by their dependencies.
 	if err != nil {
@@ -600,6 +627,27 @@ func (pl *pkgsLoader) LoadPackages(creator bft.Address, fee std.Fee, deposit std
 		if err != nil {
 			return nil, fmt.Errorf("unable to load pkg %q: %w", pkg.Name, err)
 		}
+
+		// If any replace value is specified, apply them
+		if len(pl.patchs) > 0 {
+			for _, msg := range tx.Msgs {
+				addpkg, ok := msg.(vm.MsgAddPackage)
+				if !ok {
+					continue
+				}
+
+				if addpkg.Package == nil {
+					continue
+				}
+
+				for _, file := range addpkg.Package.Files {
+					for replace, with := range pl.patchs {
+						file.Body = strings.ReplaceAll(file.Body, replace, with)
+					}
+				}
+			}
+		}
+
 		txs[i] = tx
 	}
 
diff --git a/gno.land/pkg/integration/testing_node.go b/gno.land/pkg/integration/testing_node.go
index 06020d9c94b..993386f6b04 100644
--- a/gno.land/pkg/integration/testing_node.go
+++ b/gno.land/pkg/integration/testing_node.go
@@ -42,7 +42,7 @@ func TestingInMemoryNode(t TestingTS, logger *slog.Logger, config *gnoland.InMem
 // TestingNodeConfig constructs an in-memory node configuration
 // with default packages and genesis transactions already loaded.
 // It will return the default creator address of the loaded packages.
-func TestingNodeConfig(t TestingTS, gnoroot string) (*gnoland.InMemoryNodeConfig, bft.Address) {
+func TestingNodeConfig(t TestingTS, gnoroot string, additionalTxs ...std.Tx) (*gnoland.InMemoryNodeConfig, bft.Address) {
 	cfg := TestingMinimalNodeConfig(t, gnoroot)
 
 	creator := crypto.MustAddressFromString(DefaultAccount_Address) // test1
@@ -50,7 +50,7 @@ func TestingNodeConfig(t TestingTS, gnoroot string) (*gnoland.InMemoryNodeConfig
 	balances := LoadDefaultGenesisBalanceFile(t, gnoroot)
 	txs := []std.Tx{}
 	txs = append(txs, LoadDefaultPackages(t, creator, gnoroot)...)
-	txs = append(txs, LoadDefaultGenesisTXsFile(t, cfg.Genesis.ChainID, gnoroot)...)
+	txs = append(txs, additionalTxs...)
 
 	cfg.Genesis.AppState = gnoland.GnoGenesisState{
 		Balances: balances,
diff --git a/gno.land/pkg/sdk/vm/errors.go b/gno.land/pkg/sdk/vm/errors.go
index 0020e989eb6..a0e71e08d14 100644
--- a/gno.land/pkg/sdk/vm/errors.go
+++ b/gno.land/pkg/sdk/vm/errors.go
@@ -15,18 +15,20 @@ func (abciError) AssertABCIError() {}
 // declare all script errors.
 // NOTE: these are meant to be used in conjunction with pkgs/errors.
 type (
-	InvalidPkgPathError struct{ abciError }
-	InvalidStmtError    struct{ abciError }
-	InvalidExprError    struct{ abciError }
-	TypeCheckError      struct {
+	InvalidPkgPathError   struct{ abciError }
+	InvalidStmtError      struct{ abciError }
+	InvalidExprError      struct{ abciError }
+	UnauthorizedUserError struct{ abciError }
+	TypeCheckError        struct {
 		abciError
 		Errors []string `json:"errors"`
 	}
 )
 
-func (e InvalidPkgPathError) Error() string { return "invalid package path" }
-func (e InvalidStmtError) Error() string    { return "invalid statement" }
-func (e InvalidExprError) Error() string    { return "invalid expression" }
+func (e InvalidPkgPathError) Error() string   { return "invalid package path" }
+func (e InvalidStmtError) Error() string      { return "invalid statement" }
+func (e InvalidExprError) Error() string      { return "invalid expression" }
+func (e UnauthorizedUserError) Error() string { return "unauthorized user" }
 func (e TypeCheckError) Error() string {
 	var bld strings.Builder
 	bld.WriteString("invalid gno package; type check errors:\n")
@@ -34,6 +36,10 @@ func (e TypeCheckError) Error() string {
 	return bld.String()
 }
 
+func ErrUnauthorizedUser(msg string) error {
+	return errors.Wrap(UnauthorizedUserError{}, msg)
+}
+
 func ErrInvalidPkgPath(msg string) error {
 	return errors.Wrap(InvalidPkgPathError{}, msg)
 }
diff --git a/gno.land/pkg/sdk/vm/gas_test.go b/gno.land/pkg/sdk/vm/gas_test.go
index 35706325c20..66655994bd4 100644
--- a/gno.land/pkg/sdk/vm/gas_test.go
+++ b/gno.land/pkg/sdk/vm/gas_test.go
@@ -67,7 +67,9 @@ func TestAddPkgDeliverTx(t *testing.T) {
 	gasDeliver := gctx.GasMeter().GasConsumed()
 
 	assert.True(t, res.IsOK())
-	assert.Equal(t, int64(91825), gasDeliver)
+
+	// NOTE: let's try to keep this bellow 100_000 :)
+	assert.Equal(t, int64(92825), gasDeliver)
 }
 
 // Enough gas for a failed transaction.
diff --git a/gno.land/pkg/sdk/vm/keeper.go b/gno.land/pkg/sdk/vm/keeper.go
index 78786cf0b4d..9899afa2eac 100644
--- a/gno.land/pkg/sdk/vm/keeper.go
+++ b/gno.land/pkg/sdk/vm/keeper.go
@@ -9,12 +9,14 @@ import (
 	"log/slog"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 	"sync"
 	"time"
 
 	gno "github.com/gnolang/gno/gnovm/pkg/gnolang"
 	"github.com/gnolang/gno/gnovm/stdlibs"
+	"github.com/gnolang/gno/tm2/pkg/crypto"
 	"github.com/gnolang/gno/tm2/pkg/db/memdb"
 	"github.com/gnolang/gno/tm2/pkg/errors"
 	osm "github.com/gnolang/gno/tm2/pkg/os"
@@ -247,6 +249,88 @@ func (vm *VMKeeper) getGnoStore(ctx sdk.Context) gno.Store {
 	}
 }
 
+// Namespace can be either a user or crypto address.
+var reNamespace = regexp.MustCompile(`^gno.land/(?:r|p)/([\.~_a-zA-Z0-9]+)`)
+
+// checkNamespacePermission check if the user as given has correct permssion to on the given pkg path
+func (vm *VMKeeper) checkNamespacePermission(ctx sdk.Context, creator crypto.Address, pkgPath string) error {
+	const sysUsersPkg = "gno.land/r/sys/users"
+
+	store := vm.getGnoStore(ctx)
+
+	match := reNamespace.FindStringSubmatch(pkgPath)
+	switch len(match) {
+	case 0:
+		return ErrInvalidPkgPath(pkgPath) // no match
+	case 2: // ok
+	default:
+		panic("invalid pattern while matching pkgpath")
+	}
+	if len(match) != 2 {
+		return ErrInvalidPkgPath(pkgPath)
+	}
+	username := match[1]
+
+	// if `sysUsersPkg` does not exist -> skip validation.
+	usersPkg := store.GetPackage(sysUsersPkg, false)
+	if usersPkg == nil {
+		return nil
+	}
+
+	// Parse and run the files, construct *PV.
+	pkgAddr := gno.DerivePkgAddr(pkgPath)
+	msgCtx := stdlibs.ExecContext{
+		ChainID:       ctx.ChainID(),
+		Height:        ctx.BlockHeight(),
+		Timestamp:     ctx.BlockTime().Unix(),
+		OrigCaller:    creator.Bech32(),
+		OrigSendSpent: new(std.Coins),
+		OrigPkgAddr:   pkgAddr.Bech32(),
+		// XXX: should we remove the banker ?
+		Banker:      NewSDKBanker(vm, ctx),
+		EventLogger: ctx.EventLogger(),
+	}
+
+	m := gno.NewMachineWithOptions(
+		gno.MachineOptions{
+			PkgPath:   "",
+			Output:    os.Stdout, // XXX
+			Store:     store,
+			Context:   msgCtx,
+			Alloc:     store.GetAllocator(),
+			MaxCycles: vm.maxCycles,
+			GasMeter:  ctx.GasMeter(),
+		})
+	defer m.Release()
+
+	// call $sysUsersPkg.IsAuthorizedAddressForName("<user>")
+	// We only need to check by name here, as address have already been check
+	mpv := gno.NewPackageNode("main", "main", nil).NewPackage()
+	m.SetActivePackage(mpv)
+	m.RunDeclaration(gno.ImportD("users", sysUsersPkg))
+	x := gno.Call(
+		gno.Sel(gno.Nx("users"), "IsAuthorizedAddressForName"),
+		gno.Str(creator.String()),
+		gno.Str(username),
+	)
+
+	ret := m.Eval(x)
+	if len(ret) == 0 {
+		panic("call: invalid response length")
+	}
+
+	useraddress := ret[0]
+	if useraddress.T.Kind() != gno.BoolKind {
+		panic("call: invalid response kind")
+	}
+
+	if isAuthorized := useraddress.GetBool(); !isAuthorized {
+		return ErrUnauthorizedUser(username)
+	}
+
+	return nil
+}
+
 // AddPackage adds a package with given fileset.
 func (vm *VMKeeper) AddPackage(ctx sdk.Context, msg MsgAddPackage) (err error) {
 	creator := msg.Creator
@@ -284,9 +368,9 @@ func (vm *VMKeeper) AddPackage(ctx sdk.Context, msg MsgAddPackage) (err error) {
 	// TODO: ACLs.
 	// - if r/system/names does not exists -> skip validation.
 	// - loads r/system/names data state.
-	// - lookup r/system/names.namespaces for `{r,p}/NAMES`.
-	// - check if caller is in Admins or Editors.
-	// - check if namespace is not in pause.
+	if err := vm.checkNamespacePermission(ctx, creator, pkgPath); err != nil {
+		return err
+	}
 
 	err = vm.bank.SendCoins(ctx, creator, pkgAddr, deposit)
 	if err != nil {
diff --git a/gno.land/pkg/sdk/vm/package.go b/gno.land/pkg/sdk/vm/package.go
index b2e7fbecfc4..e62a7b53928 100644
--- a/gno.land/pkg/sdk/vm/package.go
+++ b/gno.land/pkg/sdk/vm/package.go
@@ -21,4 +21,5 @@ var Package = amino.RegisterPackage(amino.NewPackage(
 	InvalidStmtError{}, "InvalidStmtError",
 	InvalidExprError{}, "InvalidExprError",
 	TypeCheckError{}, "TypeCheckError",
+	UnauthorizedUserError{}, "UnauthorizedUserError",
 ))