21. A computing device, including one or more processors, according to claim 19 , wherein the uniqueness of a timestamp is enforced when it is generated by resolving a conflict with another pre-existing timestamp.
21. A computing device, including one or more processors, according to claim 19 , wherein the uniqueness of a timestamp is enforced when it is generated by resolving a conflict with another pre-existing timestamp. 23. A computing device, including one or more processors, according to claim 21 , wherein the uniqueness of a timestamp is enforced when it is modified by a pre-specified amount of time.