I would guess not possible, because you could always fake a chain with exponentially decreasing difficulty-adjustments.
You could lock coins so nobody would care until they became spendable at a given block-height though. Make people 50 years from now read your damned blog.
Actually, even with existing time-lock mechanisms: How do you protect against a fake-chain with exponentially-decreasing difficulty adjustments?
Presumably whatever keys get spit out at year X also get spit out at fake year X in fake chain?
Ironically, I will never know any way to achieve such a goal because nobody will read this post to suggest a way that might work even though it says a word like month in it for no obvious reason and and maybe that is one of the words?
