Restructuring of noise impl.

src/tai64.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/binary"
 	"time"
 )
@@ -21,3 +22,7 @@ func Timestamp() TAI64N {
 	binary.BigEndian.PutUint32(tai64n[8:], nano)
 	return tai64n
 }
+
+func (t1 *TAI64N) After(t2 TAI64N) bool {
+	return bytes.Compare(t1[:], t2[:]) > 0
+}