diff --git a/utils/tor.go b/utils/tor.go
index 7174d1a..9261383 100644
--- a/utils/tor.go
+++ b/utils/tor.go
@@ -33,6 +33,8 @@ func expandKey(pri ed25519.PrivateKey) string {
 	return base64.StdEncoding.EncodeToString(h[:])
 }
 
+const V3HostnameLength =  56
+
 // Hidden service version
 const version = byte(0x03)
 
@@ -48,6 +50,7 @@ func getCheckdigits(pub ed25519.PublicKey) []byte {
 	return checksum[:2]
 }
 
+// GetTorV3Hostname converts an ed25519 public key to a valid tor onion hostname
 func GetTorV3Hostname(pub ed25519.PublicKey) string {
 	// Construct onion address base32(publicKey || checkdigits || version)
 	checkdigits := getCheckdigits(pub)
@@ -57,3 +60,17 @@ func GetTorV3Hostname(pub ed25519.PublicKey) string {
 	serviceID := base32.StdEncoding.EncodeToString(combined)
 	return strings.ToLower(serviceID)
 }
+
+// IsValidHostname returns true if the given address is a valid onion v3 address
+func IsValidHostname(address string) bool {
+	if len(address) == V3HostnameLength {
+		data, err := base32.StdEncoding.DecodeString(strings.ToUpper(address))
+		if err ==nil {
+			pubkey := data[0:ed25519.PublicKeySize]
+			if GetTorV3Hostname(ed25519.PublicKey(pubkey)) == address {
+				return true
+			}
+		}
+	}
+	return false
+}
\ No newline at end of file
diff --git a/utils/tor_test.go b/utils/tor_test.go
index 717cb44..e1d9f22 100644
--- a/utils/tor_test.go
+++ b/utils/tor_test.go
@@ -1,10 +1,12 @@
 package utils
 
 import (
+	"crypto/rand"
 	"crypto/rsa"
 	"crypto/x509"
 	"encoding/asn1"
 	"encoding/pem"
+	"golang.org/x/crypto/ed25519"
 	"testing"
 )
 
@@ -41,3 +43,16 @@ func TestGetTorHostname(t *testing.T) {
 		t.Errorf("Hostname %s does not equal %s", hostname, "kwke2hntvyfqm7dr")
 	}
 }
+
+
+func TestV3(t *testing.T) {
+	pub,_,_ := ed25519.GenerateKey(rand.Reader)
+	hostname := GetTorV3Hostname(pub)
+	if !IsValidHostname(hostname) {
+		t.Errorf("Generated V3 Hostname was invalid")
+	}
+
+	if IsValidHostname(hostname[0:34]) {
+		t.Errorf("Invalid V3 Hostname was marked valid")
+	}
+}
\ No newline at end of file