You're sitting at a table. At exactly 11am, a note appears in front of you saying "At exactly 12pm (one hour from now), send this note back in time exactly one hour"
So, you do that at exactly 12pm.
(1) Who wrote the note?
(2) How old is the note?
(1) Can be anyone.
(2) Impossible to know when that person started sending the message. As long as you are compliant, it's safe to assume you're compliant every time the clock turns back, so the note could be very old, but also quite new.
I eat the note, thusly dissolving the previous timespace continuum and shattering the supporting structure of the current one, leaving myself in the best possible position to lay claim as ruler of all.
Or we all die in a fit of logic, and I'm not around to care. Whichever.
Also I was going to link to a particular zarla comic, but the site is down... fortunately I saved it!
It doesn't matter if they're right. If they can't proove they're right, then they're wrong. No matter how right they may be.
If my current version of myself is only going through one space & time trajectory, what does it matter who wrote it or how old it is? I'll get the note at 11, then send the note back in time at 12. I'm not sending ME back anywhere, so when 12:01 rolls around, I'll still be the current version of myself.
1. An explosion of ink in a random area of a certain planet that got sucked into a black hole and ended up in an unending link of recurring notes at 11 am because some guy made this black hole and he was a genius who wanted to make his "mark" somewhere. Unfortunately, he didn't know that he would become a note and therefore the only way to get out of the note form would be to stop the time link. However, everybody listens for some reason...
2. I want to make the note 13. Use your imagination for what kind of unit it should be.
If you were to shoot a mime, would you use a silencer?