If whoever revives you deliberately modifies you, you're powerless to stop it.
True, which is why I'm assuming a certain minimal amount of good-will on the part of whoever revives me. However, just because the reviver has control over the technology allowing my revival doesn't mean they're actually technically competent in matters of computer security - I've seen too many stories in /r/talesfromtechsupport of computer-company executives being utterly stupid in fundamental ways for that. The main threat I'm trying to hold off is, roughly, "good-natured reviver leaves the default password in my uploaded self's router unchanged, script-kiddie running automated attacks on the whole internet gains access, script turns me into a sapient bitcoin-miner-equivalent for that hacker's benefit". That's just one example of a large class of threats. No hostile intent by the reviver is required, just a manager-level understanding of computer security.
A future-you in five years will be different from current-you who is different from the past-you of five years ago.
Yes, I know. This is one reason that I am trying not to specify /what/ it is I value in the request-doc, other than 1) instrumental goals that are good for achieving many terminal goals, and 2) valuing my own life both as an instrumental and a terminal goal, which I confidently expect to remain as one of my fundamental values for quite some time to come.
I don't think you have any power to precommit
I'll admit that I'm still thinking on this one. Socially, precommitting is mainly useful as a deterrence, and I'm working out whether trying to precommit to work against anyone who modifies my mind without my consent, or any other variation of the tactic, would be worthwhile even if I /can/ follow through.
leaves the default password in my uploaded self's router unchanged
Imagine a Faerie Queen popping into existence near you and saying: Yo, I have a favour to ask. See, a few centuries ago a guy wished to live in the far future, so I thought why not? it's gonna be fun! and I put him into stasis. It's time for him to wake up, but I'm busy so can you please reanimate him? Here is the scroll which will do it, it comes with instructions. Oh, and the guy wrote a lengthy letter before I froze him -- he seemed to have been very concerned about his soul being tric...
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