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Simple connect
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Listen to blocks
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Listen to balance change
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Generate Accounts
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Read Storage
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Craft Extrinsic
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Transfer DOTs
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</a>
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<!-- Title -->
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<h1>
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<a href="../../.." >Craft Extrinsic</a>
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<section class="normal markdown-section">
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<h1 id="craft-extrinsic">Craft Extrinsic</h1>
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<p>In the current version, crafting an extrinsic is a rather cumbersome process. This sample guides you through it and shows how to tranfer DOTs from one an account to another.</p>
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<pre><code class="lang-javascript"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">BN</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'bn.js'</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">Rpc</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'@polkadot/rpc-core'</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">WsProvider</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'@polkadot/rpc-provider/ws'</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">extrinsics</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'@polkadot/extrinsics'</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">encodeExtrinsic</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'@polkadot/extrinsics/codec/encode'</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">encodeLength</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'@polkadot/extrinsics/codec/encode/length'</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">Keyring</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'@polkadot/util-keyring'</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">storage</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'@polkadot/storage'</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">Encoder</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">TextEncoder</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">keyring</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">Keyring</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">provider</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">WsProvider</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'ws://127.0.0.1:9944'</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">api</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">Rpc</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">provider</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-ident">async</span> <span class="sunlight-keyword">function</span> <span class="sunlight-named-ident">getAccountIndex</span> <span class="sunlight-punctuation">(</span><span class="sunlight-ident">address</span><span class="sunlight-punctuation">)</span> <span class="sunlight-punctuation">{</span>
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  <span class="sunlight-keyword">return</span> <span class="sunlight-ident">api</span><span class="sunlight-operator">.</span><span class="sunlight-ident">state</span><span class="sunlight-operator">.</span><span class="sunlight-ident">getStorage</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">[</span><span class="sunlight-ident">storage</span><span class="sunlight-operator">.</span><span class="sunlight-ident">system</span><span class="sunlight-operator">.</span><span class="sunlight-reservedWord">public</span><span class="sunlight-operator">.</span><span class="sunlight-ident">accountIndexOf</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">address</span><span class="sunlight-punctuation">]</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-punctuation">}</span>
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<span class="sunlight-ident">async</span> <span class="sunlight-keyword">function</span> <span class="sunlight-named-ident">transfer</span> <span class="sunlight-punctuation">(</span><span class="sunlight-ident">keyRingFrom</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">addressTo</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">amount</span><span class="sunlight-punctuation">)</span> <span class="sunlight-punctuation">{</span>
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  <span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">accountIndex</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">await</span> <span class="sunlight-ident">getAccountIndex</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">keyRingFrom</span><span class="sunlight-operator">.</span><span class="sunlight-ident">address</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">`</span><span class="sunlight-ident">Current</span> <span class="sunlight-ident">accountIndex</span><span class="sunlight-operator">:</span> <span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-ident">accountIndex</span><span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-comment">// encode the call for signing</span>
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  <span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">message</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">encodeExtrinsic</span><span class="sunlight-punctuation">(</span>
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    <span class="sunlight-ident">keyRingFrom</span><span class="sunlight-operator">.</span><span class="sunlight-ident">publicKey</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">,</span>
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    <span class="sunlight-ident">accountIndex</span><span class="sunlight-punctuation">,</span>
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    <span class="sunlight-ident">extrinsics</span><span class="sunlight-operator">.</span><span class="sunlight-ident">staking</span><span class="sunlight-operator">.</span><span class="sunlight-reservedWord">public</span><span class="sunlight-operator">.</span><span class="sunlight-ident">transfer</span><span class="sunlight-punctuation">,</span>
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    <span class="sunlight-punctuation">[</span><span class="sunlight-ident">addressTo</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">amount</span><span class="sunlight-punctuation">]</span>
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  <span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-comment">// get the signature</span>
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  <span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">signature</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">keyRingFrom</span><span class="sunlight-operator">.</span><span class="sunlight-ident">sign</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">message</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-comment">// encode the extrinsic for submission, adding the length (prefix) and the</span>
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  <span class="sunlight-comment">// signature (postfix)Rödl</span>
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  <span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">encoded</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">encodeLength</span><span class="sunlight-punctuation">(</span>
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    <span class="sunlight-comment">// When working with publicKeys, the prefix is 0xff for poc-2+</span>
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    <span class="sunlight-keyword">new</span> <span class="sunlight-ident">Uint8Array</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">[</span><span class="sunlight-number">0xff</span><span class="sunlight-punctuation">]</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">,</span>
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    <span class="sunlight-ident">message</span><span class="sunlight-punctuation">,</span>
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    <span class="sunlight-ident">signature</span>
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  <span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-keyword">return</span> <span class="sunlight-ident">api</span><span class="sunlight-operator">.</span><span class="sunlight-ident">author</span><span class="sunlight-operator">.</span><span class="sunlight-ident">submitExtrinsic</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">encoded</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-punctuation">}</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">Alice</span> <span class="sunlight-operator">=</span> <span class="sunlight-ident">keyring</span><span class="sunlight-operator">.</span><span class="sunlight-ident">addFromSeed</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">Encoder</span><span class="sunlight-operator">.</span><span class="sunlight-ident">encode</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'Alice                           '</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">addressBob</span> <span class="sunlight-operator">=</span> <span class="sunlight-string">'5Gw3s7q4QLkSWwknsiPtjujPv3XM4Trxi5d4PgKMMk3gfGTE'</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">amount</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">BN</span><span class="sunlight-punctuation">(</span><span class="sunlight-number">999</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span> <span class="sunlight-comment">// on dev chain, the fee is 1, that makes it a round 1000</span>
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<span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">`</span><span class="sunlight-ident">Crafting</span> <span class="sunlight-ident">and</span> <span class="sunlight-ident">sending</span> <span class="sunlight-ident">an</span> <span class="sunlight-ident">extrinsic</span> <span class="sunlight-keyword">for</span> <span class="sunlight-ident">Alice</span> <span class="sunlight-ident">to</span> <span class="sunlight-ident">send</span> <span class="sunlight-ident">Bob</span> <span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-ident">amount</span><span class="sunlight-punctuation">}</span> <span class="sunlight-ident">DOTs</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-ident">transfer</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">Alice</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">addressBob</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">amount</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-ident">then</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'Sent'</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-keyword">catch</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'HINT: Make sure you wait for the storage to update before sending the next extrinsic'</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-keyword">finally</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">_</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-ident">process</span><span class="sunlight-operator">.</span><span class="sunlight-ident">exit</span><span class="sunlight-punctuation">(</span><span class="sunlight-number">0</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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</span></pre></div></div></code></pre>
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