diff --git a/tai64n/tai64n.go b/tai64n/tai64n.go
index f402f05..565aaa4 100644
--- a/tai64n/tai64n.go
+++ b/tai64n/tai64n.go
@@ -12,7 +12,8 @@ import (
 )
 
 const TimestampSize = 12
-const base = uint64(4611686018427387914)
+const base = uint64(0x400000000000000a)
+const whitenerMask = uint32(0x1000000 - 1)
 
 type Timestamp [TimestampSize]byte
 
@@ -20,7 +21,7 @@ func Now() Timestamp {
 	var tai64n Timestamp
 	now := time.Now()
 	secs := base + uint64(now.Unix())
-	nano := uint32(now.Nanosecond())
+	nano := uint32(now.Nanosecond()) &^ whitenerMask
 	binary.BigEndian.PutUint64(tai64n[:], secs)
 	binary.BigEndian.PutUint32(tai64n[8:], nano)
 	return tai64n