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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Unofficial Monero Documentation"><meta name=author content="Piotr 'Qertoip' Włodarek"><link href=https://monerodocs.org/todo/confidential-transactions/ rel=canonical><link rel="shortcut icon" href=../../assets/favicon.png><meta name=generator content="mkdocs-1.1.2, mkdocs-material-6.2.5"><title>Confidential transactions - Monero Documentation</title><link rel=stylesheet href=../../assets/stylesheets/main.15aa0b43.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.75751829.min.css><meta name=theme-color content=#ffffff><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700%7CRoboto+Mono&display=fallback"><style>body,input{font-family:"Roboto",-apple-system,BlinkMacSystemFont,Helvetica,Arial,sans-serif}code,kbd,pre{font-family:"Roboto Mono",SFMono-Regular,Consolas,Menlo,monospace}</style><link rel=stylesheet href=../../overrides.css></head> <body dir=ltr data-md-color-scheme data-md-color-primary=white data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header-nav md-grid" aria-label=Header> <a href=https://monerodocs.org title="Monero Documentation" class="md-header-nav__button md-logo" aria-label="Monero Documentation"> <img src=../../images/monero.svg alt=logo> </a> <label class="md-header-nav__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2z"/></svg> </label> <div class=md-header-nav__title data-md-component=header-title> <div class=md-header-nav__ellipsis> <div class=md-header-nav__topic> <span class=md-ellipsis> Monero Documentation </span> </div> <div class=md-header-nav__topic> <span class=md-ellipsis> Confidential transactions </span> </div> </div> </div> <label class="md-header-nav__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0116 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 019.5 16 6.5 6.5 0 013 9.5 6.5 6.5 0 019.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5z"/></svg> </label> <div class=md-search data-md-component=search role=dialog> <label class=md-search__overlay for=__search></label> <div class=md-search__inner role=search> <form class=md-search__form name=search> <input type=text class=md-search__input name=query aria-label=Search placeholder=Search autocapitalize=off autocorrect=off autocomplete=off spellcheck=false data-md-component=search-query data-md-state=active required> <label class="md-search__icon md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0116 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 019.5 16 6.5 6.5 0 013 9.5 6.5 6.5 0 019.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5z"/></svg> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg> </label> <button type=reset class="md-search__icon md-icon" aria-label=Clear data-md-component=search-reset tabindex=-1> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41z"/></svg> </button> </form> <div class=md-search__output> <div class=md-search__scrollwrap data-md-scrollfix> <div class=md-search-result data-md-component=search-result> <div class=md-search-result__meta> Initializing search </div> <ol class=md-search
An ECC break will permit deanonymizing amounts in the historical chain.
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</code></pre></div> <p>In other words:</p> <div class=highlight><pre><span></span><code>An ECC break means the currency can undetectably be inflated (going forward).
An ECC break means the ledger&#39;s history can retroactively be deanonymized (goin backward).
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</code></pre></div> <p>So we are faced with a choice between those two regardless if we want better privacy. Some people believe the second is worse than the first, and choosing the first actually allows for more efficient technology. This is a choice that Zcash, Monero, Grin, all make. CT with Bulletproofs would do the same.</p> <p>However, regardless of your own opinion in this matter, Bitcoin's evolution is a large collaborative process, where such fundamental changes need buy-in from large parts of the ecosystem. My fear is that the question of giving up the ability to exactly audit the monetary supply is going to make it hard to make CT acceptable.</p> <p>Furthermore, there are other challenges. CT makes transactions larger, slower to verify, and poses a very significant engineering challenge to incorporate into Bitcoin without breaking backward compatibility.</p> <p>++++</p> <blockquote> <p>Also, is there any possible system that can have unconditional soundness and privacy at the same time (something other than ECC obviously)?</p> </blockquote> <p>No, that's mathematically impossible.</p> </article> </div> </div> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-footer-copyright style="margin: auto;"> <a href=http://bumz4sduzxzlobbgzy5fiufdflg3mo2jyecdwdx5rphrqldms7wlmiid.onion/ >Tor onion version</a> &nbsp; | &nbsp; <a href=https://qertoip.com/ >contact</a> &nbsp; | &nbsp; © 2021 MoneroDocs under <a href=https://opensource.org/licenses/MIT>MIT</a> &nbsp; | &nbsp; built w/ <a href=https://www.mkdocs.org/ >mkdocs</a> and <a href=https://squidfunk.github.io/mkdocs-material/ >squidfunk/material</a> </div> </div> </div> </footer> </div> <script src=../../assets/javascripts/vendor.93c04032.min.js></script> <script src=../../assets/javascripts/bundle.83e5331e.min.js></script><script id=__lang type=application/json>{"clipboard.copy": "Copy to clipboard", "clipboard.copied": "Copied to clipboard", "search.config.lang": "en", "search.config.pipeline": "trimmer, stopWordFilter", "search.config.separator": "[\\s\\-]+", "search.placeholder": "Search", "search.result.placeholder": "Type to start searching", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.term.missing": "Missing"}</script> <script>
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