<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">On Mon, Nov 17, 2025 at 8:29 PM Adrian Tymes via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:</span></div></div><div class="gmail_quote gmail_quote_container"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><font size="4" face="tahoma, sans-serif"><b>
><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">></span> Nobody can pinpoint the exact day a quantum computer capable of running Shor’s algorithm will become operational,</b></font></blockquote>
<br><font size="4" face="georgia, serif"><i>
<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">> </span>And I don't need to.</i></font><br></blockquote><div><br></div><font size="4" face="tahoma, sans-serif"><b>You do if you insist on waiting till the last possible second to sell your <span class="gmail_default" style="font-family:arial,helvetica,sans-serif">B</span>itcoins. If you insist on wringing every last cent<span class="gmail_default" style=""> </span>out of your <span class="gmail_default" style="font-family:arial,helvetica,sans-serif">B</span>itcoin investment then your economic timing needs to be perfect. Is your timing perfect?</b></font><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><font size="4" face="georgia, serif"><i><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">></span>the introduction of said computer might not happen within<br>
any predefined timeframe,<span class="gmail_default" style=""> </span>thus meaning that any bet against it might</i></font></blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><font size="4" face="georgia, serif"><i>
never be judgeable, I might be willing to bet against such an event.</i></font><br></blockquote><div><br></div><div><font size="4" face="tahoma, sans-serif"><b>Maybe<span class="gmail_default" style="">.</span><span class="gmail_default" style=""> </span>There is a possibility<span class="gmail_default" style=""> that the timeframe given by one of the world's greatest experts in quantum computers is wrong and your intuition is right, thus there is a non-zero probability that you won't go broke. But are you really willing to bet that your opinion about quantum computers is better than his? </span> It doesn't seem like a very good be<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">t</span> to me.<span class="gmail_default" style="font-family:arial,helvetica,sans-serif"> </span></b></font></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><font size="4" face="georgia, serif"><i>
<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">> </span>When - and if - said computer comes into existence, then it may be<br>
time to reevaluate continued holding of Bitcoin based on this metric.</i></font><br></blockquote><div><br></div><div><font size="4" face="tahoma, sans-serif"><b>Are you kidding?<span class="gmail_default" style=""> At that point it will be far far too late. </span> </b></font></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><font size="4" face="georgia, serif"><i>
<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">> </span>But not until then.</i></font> </blockquote><div><br></div><div><font size="4" face="tahoma, sans-serif"><b>Well… Enjoy your money while you have it.<span class="gmail_default" style=""> </span> </b></font></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><font size="4" face="georgia, serif"><i> <span class="gmail_default" style="font-family:arial,helvetica,sans-serif">> </span>As someone else mentioned, Bitcoin may be<span class="gmail_default" style=""> </span>upgraded to use quantum cryptography by then, negating the threat.<br></i></font></blockquote><div><br></div><div><font size="4" face="tahoma, sans-serif"><b><span class="gmail_default" style="">That's not even on the horizon. Q</span>uantum <span class="gmail_default" style="">C</span>ryptography<span class="gmail_default" style=""> is as secure as the laws of physics, however you'd need a completely new Internet for that with hardware (not just software) that works on entirely different principles and is very expensive and temperamental. </span></b></font><b style="font-family:tahoma,sans-serif;font-size:large"><span class="gmail_default">Currently that is not even close to being practical for large scale use. I'd be willing to bet that the AI Singularity will happen well before that. </span></b></div><div><b style="font-family:tahoma,sans-serif;font-size:large"><span class="gmail_default"><br></span></b></div><div><b style="font-family:tahoma,sans-serif;font-size:large"><span class="gmail_default">Maybe you meant quantum resistant algorithms, they are possible and semi-practical but it would mean that each bitcoin transaction would require even more energy and computation that it already does, and Bitcoin is already extraordinarily wasteful. And the transition between the elliptic curve encryption that Bitcoin currently uses to one of the quantum resistant algorithms would be very difficult to achieve if you wanted backward compatibility; it would be especially difficult to protect </span>coins that have been spent even once<span class="gmail_default"> because then their public key would have been already exposed. </span></b></div><div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></span></div><div><span class="gmail_default" style=""><font size="4" style="" face="tahoma, sans-serif"><b style="">And there's another thing, some believe that these new algorithms are resistant to attacks by quantum computers but that has never been mathematically proven. So as I've said before, when people see that quantum computers have produced millions of Bitcoin bankruptcies they're going to be very suspicious of any cryptocurrency regardless of what algorithm they use. </b></font></span></div><div><span class="gmail_default" style=""><font size="4" style="" face="tahoma, sans-serif"><b style=""><br></b></font></span></div><div><span class="gmail_default" style=""><font size="4" style="" face="tahoma, sans-serif"><b style="">In summary I don't see how cryptocurrency has a future. </b></font></span></div><div><span class="gmail_default" style=""><font size="4" style="" face="tahoma, sans-serif"><b style=""><br></b></font></span></div><div><span class="gmail_default" style=""><font size="4" style="" face="tahoma, sans-serif"><b style="">John K Clark </b></font></span></div><div><br></div><div><br></div><div> </div></div></div>