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Time Machines & Experiments
A simple experiment
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<blockquote data-quote="Ayasano" data-source="post: 87295" data-attributes="member: 4804"><p>A few days ago I came up with an idea, while thinking about messages left for future/past selves or trusted individuals, or as a means to contact someone. Leaving yourself a message seems like an easy thing to do at first, but when you start to think about it, it's actually somewhat complicated. (I myself have several avenues of communication set up. No messages yet though)</p><p></p><p>Will your message still be around far in the future? Will it be easy for your future self to remember that such a message would even exist? And if so, how would they find it? Websites shut down all the time, and physical messages are subject to decay and erosion.</p><p></p><p>If your future self or a trusted invidual travelled to the past and left a message for you, how would you know it was real? (We'll assume that your future self doesn't track you down directly to talk to you, because they either aren't allowed, or you're difficult to find)</p><p></p><p></p><p>There are only realy two places I know of on the internet that content is stored long-term, and only one of those allows you to search that content directly. That would be Google's cache. (The other is the Wayback Machine, which currently only searches via URL) From what I can tell, non-existent sites only get removed from Google's cache if someone submits a removal request, but I may be wrong. Google itself is likely to be around for a very long time. Incidentally, it seems to take a couple of weeks for content to be archived, as some threads from this site from the end of July are available in the Google cache, while more recent messages don't seem to be.</p><p></p><p>So now you have a way to search for messages, but what do you search for? You can't know a message in advance to search for it.</p><p></p><p>ba9e227b9b4ae48763a6cf71e2592b2cc7064aa770419791104389cb0700e92b8bade336127e7aca6f2e843b6164ad8bac6d5ce3f41a618c60440be211cd7781</p><p></p><p>That is the first half of a passphrase, (all lower case, no punctuation, just spaces) run through the SHA-512 algorithm. ( <a href="http://hash.online-convert.com/sha512-generator" target="_blank">Calculate a SHA-512 hash</a> ) It's unique enough that it will only appear in Google's cache if someone specifically posts it somewhere. As long as you remember the passphrase and have access to the SHA-512 algorithm, you can search for it to find messages left by your younger self, or accounts that can be contacted. (Put it in a forum signature, for example) Your elder self can leave messages marked with the second half of the phrase, and you can use a second passphrase privately to prove you are who you say you are.</p><p></p><p></p><p>For most people this experiment will be entirely useless, but as a transhumanist I have every intention of living a long, long time, and maybe in that time I'll discover time travel, or meet someone who has. Perhaps one of you will post a similar beacon here and receive a message with the private passphrase. Who knows?</p><p></p><p>Edit: In an interesting note, it seems Google already crawled this page and added it to the cache. That was much faster than I thought.</p></blockquote><p></p>
[QUOTE="Ayasano, post: 87295, member: 4804"] A few days ago I came up with an idea, while thinking about messages left for future/past selves or trusted individuals, or as a means to contact someone. Leaving yourself a message seems like an easy thing to do at first, but when you start to think about it, it's actually somewhat complicated. (I myself have several avenues of communication set up. No messages yet though) Will your message still be around far in the future? Will it be easy for your future self to remember that such a message would even exist? And if so, how would they find it? Websites shut down all the time, and physical messages are subject to decay and erosion. If your future self or a trusted invidual travelled to the past and left a message for you, how would you know it was real? (We'll assume that your future self doesn't track you down directly to talk to you, because they either aren't allowed, or you're difficult to find) There are only realy two places I know of on the internet that content is stored long-term, and only one of those allows you to search that content directly. That would be Google's cache. (The other is the Wayback Machine, which currently only searches via URL) From what I can tell, non-existent sites only get removed from Google's cache if someone submits a removal request, but I may be wrong. Google itself is likely to be around for a very long time. Incidentally, it seems to take a couple of weeks for content to be archived, as some threads from this site from the end of July are available in the Google cache, while more recent messages don't seem to be. So now you have a way to search for messages, but what do you search for? You can't know a message in advance to search for it. ba9e227b9b4ae48763a6cf71e2592b2cc7064aa770419791104389cb0700e92b8bade336127e7aca6f2e843b6164ad8bac6d5ce3f41a618c60440be211cd7781 That is the first half of a passphrase, (all lower case, no punctuation, just spaces) run through the SHA-512 algorithm. ( [URL='http://hash.online-convert.com/sha512-generator']Calculate a SHA-512 hash[/URL] ) It's unique enough that it will only appear in Google's cache if someone specifically posts it somewhere. As long as you remember the passphrase and have access to the SHA-512 algorithm, you can search for it to find messages left by your younger self, or accounts that can be contacted. (Put it in a forum signature, for example) Your elder self can leave messages marked with the second half of the phrase, and you can use a second passphrase privately to prove you are who you say you are. For most people this experiment will be entirely useless, but as a transhumanist I have every intention of living a long, long time, and maybe in that time I'll discover time travel, or meet someone who has. Perhaps one of you will post a similar beacon here and receive a message with the private passphrase. Who knows? Edit: In an interesting note, it seems Google already crawled this page and added it to the cache. That was much faster than I thought. [/QUOTE]
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A simple experiment
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