>Timestamp are needed for DELTAs with POTUS tweets but are also checksum of the crumbs themselves
I agree with you there. I was doing some work looking at POTUS Tweets timestamps and showed how they might be used to reference particular parts of a Q drop (refer https://8ch.net/qresearch/res/4557354.html).
My theory is that his daily tweets are sent at a certain time, so that they flag particular parts of Q posts, either in their entirety, or the attachments or links, in order to signal to us what is coming up or what we parts of the map we need to be focussing on.
But sadly the process was over a lot of peoples heads and there's a lot more complexity involved with the initial decoding since Dec 2018, due to active disinfo campaigns being employed.