NewClock constructs a Clock value from a genesis timestamp (t) and a Genesis Validator Root (vr).

NewClockSynchronizer initializes a single instance of ClockSynchronizer that must be used by all ClockWaiters that need to be synchronized to a ClockSetter (ie blockchain service).

WithNower allows tests in particular to inject an alternate implementation of time.Now (vs using system time).

Clock abstracts important time-related concerns in the beacon chain: - provides a time.Now() construct that can be overridden in tests - GenesisTime() to know the genesis time or use genesis time determination as a synchronization point.

ClockSynchronizer provides a synchronization mechanism for services that rely on the genesis time and validator root being known before getting to work.

ClockSetter specifies the SetClock method.

ClockWaiter specifies the WaitForClock method.

ClockOpt is a functional option to change the behavior of a clock value made by NewClock.

Nower is a function that can return the current time.