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5d73e960da
The timestamp inherent type was up to now just a simple `u64`. This worked, but doesn't give you that much guarantees at compile time about the type. This pr changes that by converting this type to a unit type wrapper, similar to what we have done for `Slot`. This is required for some future pr that touches quite a lot of the inherents stuff :) Besides this unit wrapper type, this pr also moves the `OnTimestampSet` trait to `frame_support::traits`.
Aura (Authority-round) consensus in substrate.
Aura works by having a list of authorities A who are expected to roughly agree on the current time. Time is divided up into discrete slots of t seconds each. For each slot s, the author of that slot is A[s % |A|].
The author is allowed to issue one block but not more during that slot, and it will be built upon the longest valid chain that has been seen.
Blocks from future steps will be either deferred or rejected depending on how far in the future they are.
NOTE: Aura itself is designed to be generic over the crypto used.
License: GPL-3.0-or-later WITH Classpath-exception-2.0