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      "title": "How to create Bitcoin Addresses in Node.JS Cryptographically",
      "body": "<html>\n<p>In my spare time I strive to learn, Learning is without doubt my favourite hobby. In the past week I decided to turn my attention to Node.JS, A framework for JavaScript that allows access to the Windows API and some filesystem functions. I am not the best at putting information across but I would like to share my findings in case it may help anyone. Please be patient and feel free to ask me for clarification.</p>\n<p>Now, I wont go through the basics of install Node.JS, It is my assumption that you already have it.</p>\n<p>Bitcoin addresses are created using <a href=\"https://en.wikipedia.org/wiki/Elliptic-curve_cryptography\">elliptic-curve cryptography</a>, I dont claim to be an expert at cryptography, I know a little to get by for personal use. So I wont go into this much. I would suggest reading the <a href=\"https://bitcoin.org/en/developer-reference\">bitcoin.org developer reference</a> to look into how Bitcoin utilises this.&nbsp;</p>\n<p>So lets start with the actual code.</p>\n<p><strong>Step 1.</strong> We will need some Node.JS packages to be able to do some cryptographic functions like hashing.</p>\n<p>Create a new directory, Go to that directory in command prompt or terminal.</p>\n<pre><code>npm install --save crypto elliptic ripemd160 bs58 buffer</code></pre>\n<p><strong>Step 2.</strong> Once we have these packages installed we can go ahead and code.</p>\n<p>Create a new file in the same directory as the node_modules folder called index.js</p>\n<p>Step 3. We need to require our dependencies so that we are able to use them.</p>\n<p>At the top of index.js</p>\n<pre><code>const crypto = require('crypto');<br>\nconst EC = require('elliptic').ec;<br>\nconst RIPEMD160 = require('ripemd160');<br>\nconst bs58 = require('bs58');<br>\nconst buffer = require('buffer');<br>\nconst ec = new EC('secp256k1');<br>\n<br>\nfunction hasha256(data) {<br>\n &nbsp;&nbsp;&nbsp;return crypto.createHash('sha256').update(data).digest();<br>\n} // A small function I created as there is a lot of sha256 hashing.</code></pre>\n<p><strong>Step 4.</strong> We will also need to add some extra information specific to Bitcoin</p>\n<pre><code>const addrVer = Buffer.alloc(1, 0x00); // 0x00 P2PKH Mainnet, 0x6f P2PKH Testnet<br>\nconst wifByte = Buffer.alloc(1, 0x80); // 0x80 Mainnet, 0xEF Testnet</code></pre>\n<p>The buffer library allows us &nbsp;to work with bytes. We are creating 1 byte with Bitcoin specifics.</p>\n<p><strong>Step 5.</strong> Generate Public / Private Keys</p>\n<pre><code>var key = ec.genKeyPair();<br>\nvar privKey = key.getPrivate().toString('hex');<br>\nvar pubPoint = key.getPublic();<br>\nvar x = pubPoint.getX(); // elliptic x<br>\nvar y = pubPoint.getY(); // elliptic y</code></pre>\n<p><strong>Step 6.</strong> Now we will turn the hex based private key into bytes using buffer and add our wifByte from step 4 onto the front of the private key.</p>\n<pre><code>var bufPrivKey = Buffer.from(privKey, 'hex');<br>\nvar wifBufPriv = Buffer.concat([wifByte, bufPrivKey], wifByte.length + bufPrivKey.length);</code></pre>\n<p>Buffer.concat with concatenate (link/join) the two byte strings together.</p>\n<p><strong>Step 7. </strong>Now we will finish creating our private key in WIF format (Wallet Import Format)</p>\n<pre><code>var wifHashFirst = hasha256(wifBufPriv);<br>\nvar wifHashSecond = hasha256(wifHashFirst);<br>\nvar wifHashSig = wifHashSecond.slice(0, 4);<br>\nvar wifBuf = Buffer.concat([wifBufPriv, wifHashSig], wifBufPriv.length + wifHashSig.length);<br>\nvar wifFinal = bs58.encode(wifBuf);</code></pre>\n<p>We first hash the wifBufPriv concatenated byte string from step 6. We then hash again. We take 4 bytes for the signature. Then we add the signature to the end of the concatenated byte string from step 6.</p>\n<p>Finally we encode our final byte string in base58. We now have a WIF key.</p>\n<p>Step 8. Now we will move on to creating the Public key in a Bitcoin format.</p>\n<pre><code>var publicKey = pubPoint.encode('hex');<br>\nvar publicKeyInitialHash = hasha256(Buffer.from(publicKey, 'hex'));<br>\nvar publicKeyRIPEHash = new RIPEMD160().update(Buffer.from(publicKeyInitialHash, 'hex')).digest('hex');<br>\nvar hashBuffer = Buffer.from(publicKeyRIPEHash, 'hex');<br>\nvar concatHash = Buffer.concat([addrVer, hashBuffer], addrVer.length + hashBuffer.length);<br>\nvar hashExtRipe = hasha256(concatHash);<br>\nvar hashExtRipe2 = hasha256(hashExtRipe);<br>\nvar hashSig = hashExtRipe2.slice(0, 4);<br>\nvar bitcoinBinaryStr = Buffer.concat([concatHash, hashSig], concatHash.length + hashSig.length);</code></pre>\n<p>All the above code hashes the public key multiple times, Joins the address version for mainnet set in step 4.</p>\n<p><strong>Step 9. </strong>We are now ready to print our private key in WIF format and our public Bitcoin address.</p>\n<pre><code>var bitcoinWifAddress = wifFinal.toString('hex');<br>\nvar bitcoinAddress = bs58.encode(Buffer.from(bitcoinBinaryStr));</code></pre>\n<p>After this lets create 2 console.log statements to print our keys.</p>\n<pre><code>console.log(\"WIF Private Key : %s\", bitcoinWifAddress.toString('hex'));<br>\nconsole.log(\"Bitcoin Address : %s\", bitcoinAddress.toString('hex'));</code></pre>\n<p>So now our final code looks like this <a href=\"https://pastebin.com/ULaX59fF\">https://pastebin.com/ULaX59fF</a></p>\n<p>Lets run our program</p>\n<pre><code>D:\\Dev\\Node\\Addr&gt;node index.js<br>\nWIF Private Key : 5J8HacMzXqfoX27RpGHsYHsCNcVJJtcD65k9WCUwJJawraA2hUv<br>\nBitcoin Address : 1G91P27MhZAiTnevEQRLok11uXTZUX8EtP</code></pre>\n<p>You can see an image here <a href=\"https://imgur.com/DvpaTGy\">https://imgur.com/DvpaTGy</a></p>\n<p>I hope this has been useful for some people, I know my teaching skills are not great and I am still learning node myself. Please leave any constructive criticism or comments. Share the knowledge :)</p>\n<p>dlystyr</p>\n</html>",
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