diff --git a/examples/check_witness.go b/examples/check_witness.go
new file mode 100644
index 000000000..17b399cc7
--- /dev/null
+++ b/examples/check_witness.go
@@ -0,0 +1,17 @@
+package check_witness_contract
+
+import (
+	"github.com/CityOfZion/neo-go-sc/interop/runtime"
+	"github.com/CityOfZion/neo-go-sc/interop/util"
+)
+
+// Check if the invoker of the contract is the specified owner.
+
+var owner = util.FromAddress("Aej1fe4mUgou48Zzup5j8sPrE3973cJ5oz")
+
+func Main() bool {
+	if runtime.CheckWitness(owner) {
+		return true
+	}
+	return false
+}
diff --git a/interop/runtime/runtime.go b/interop/runtime/runtime.go
new file mode 100644
index 000000000..da0e82bcb
--- /dev/null
+++ b/interop/runtime/runtime.go
@@ -0,0 +1,6 @@
+package runtime
+
+// CheckWitness verifies if the given hash is the invoker of the contract.
+func CheckWitness(hash []byte) bool {
+	return true
+}
diff --git a/interop/util/util.go b/interop/util/util.go
new file mode 100644
index 000000000..f5b658fdd
--- /dev/null
+++ b/interop/util/util.go
@@ -0,0 +1,6 @@
+package util
+
+// FromAddress is an utility function that converts an NEO address to its hash.
+func FromAddress(address string) []byte {
+	return nil
+}