Is it even possible to cryptographically lock a file such that it can only be decrypted once a certain block-height is reached? Pass a message that can be unlocked only in the future?

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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?