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<h1 id="craft-extrinsic">Craft Extrinsic</h1>
<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>
<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>&#xA0;<span class="sunlight-ident">BN</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;bn.js&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">Rpc</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/rpc-core&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">WsProvider</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/rpc-provider/ws&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">extrinsics</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/extrinsics&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">encodeExtrinsic</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/extrinsics/codec/encode&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">encodeLength</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/extrinsics/codec/encode/length&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">Keyring</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/util-keyring&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">storage</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/storage&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">default</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">Encoder</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<span class="sunlight-ident">TextEncoder</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">keyring</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<span class="sunlight-ident">Keyring</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">provider</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<span class="sunlight-ident">WsProvider</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;ws://127.0.0.1:9944&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">api</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<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>
<span class="sunlight-ident">async</span>&#xA0;<span class="sunlight-keyword">function</span>&#xA0;<span class="sunlight-named-ident">getAccountIndex</span>&#xA0;<span class="sunlight-punctuation">(</span><span class="sunlight-ident">address</span><span class="sunlight-punctuation">)</span>&#xA0;<span class="sunlight-punctuation">{</span>
&#xA0;&#xA0;<span class="sunlight-keyword">return</span>&#xA0;<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>&#xA0;<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>
<span class="sunlight-ident">async</span>&#xA0;<span class="sunlight-keyword">function</span>&#xA0;<span class="sunlight-named-ident">transfer</span>&#xA0;<span class="sunlight-punctuation">(</span><span class="sunlight-ident">keyRingFrom</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">addressTo</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">amount</span><span class="sunlight-punctuation">)</span>&#xA0;<span class="sunlight-punctuation">{</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">accountIndex</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">await</span>&#xA0;<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>
&#xA0;&#xA0;<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>&#xA0;<span class="sunlight-ident">accountIndex</span><span class="sunlight-operator">:</span>&#xA0;<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>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;encode&#xA0;the&#xA0;call&#xA0;for&#xA0;signing</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">message</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">encodeExtrinsic</span><span class="sunlight-punctuation">(</span>
&#xA0;&#xA0;&#xA0;&#xA0;<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>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">accountIndex</span><span class="sunlight-punctuation">,</span>
&#xA0;&#xA0;&#xA0;&#xA0;<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>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-punctuation">[</span><span class="sunlight-ident">addressTo</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">amount</span><span class="sunlight-punctuation">]</span>
&#xA0;&#xA0;<span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;get&#xA0;the&#xA0;signature</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">signature</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<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>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;encode&#xA0;the&#xA0;extrinsic&#xA0;for&#xA0;submission,&#xA0;adding&#xA0;the&#xA0;length&#xA0;(prefix)&#xA0;and&#xA0;the</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;signature&#xA0;(postfix)R&#xF6;dl</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">encoded</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">encodeLength</span><span class="sunlight-punctuation">(</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;When&#xA0;working&#xA0;with&#xA0;publicKeys,&#xA0;the&#xA0;prefix&#xA0;is&#xA0;0xff&#xA0;for&#xA0;poc-2+</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<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>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">message</span><span class="sunlight-punctuation">,</span>
&#xA0;&#xA0;&#xA0;&#xA0;<span class="sunlight-ident">signature</span>
&#xA0;&#xA0;<span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-keyword">return</span>&#xA0;<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>
<span class="sunlight-punctuation">}</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">Alice</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<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">&apos;Alice&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">addressBob</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-string">&apos;5Gw3s7q4QLkSWwknsiPtjujPv3XM4Trxi5d4PgKMMk3gfGTE&apos;</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">amount</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<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>&#xA0;<span class="sunlight-comment">//&#xA0;on&#xA0;dev&#xA0;chain,&#xA0;the&#xA0;fee&#xA0;is&#xA0;1,&#xA0;that&#xA0;makes&#xA0;it&#xA0;a&#xA0;round&#xA0;1000</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-punctuation">`</span><span class="sunlight-ident">Crafting</span>&#xA0;<span class="sunlight-ident">and</span>&#xA0;<span class="sunlight-ident">sending</span>&#xA0;<span class="sunlight-ident">an</span>&#xA0;<span class="sunlight-ident">extrinsic</span>&#xA0;<span class="sunlight-keyword">for</span>&#xA0;<span class="sunlight-ident">Alice</span>&#xA0;<span class="sunlight-ident">to</span>&#xA0;<span class="sunlight-ident">send</span>&#xA0;<span class="sunlight-ident">Bob</span>&#xA0;<span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-ident">amount</span><span class="sunlight-punctuation">}</span>&#xA0;<span class="sunlight-ident">DOTs</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-ident">transfer</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">Alice</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">addressBob</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">amount</span><span class="sunlight-punctuation">)</span>
&#xA0;&#xA0;<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>&#xA0;<span class="sunlight-operator">=</span><span class="sunlight-operator">&gt;</span>&#xA0;<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">&apos;Sent&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span>
&#xA0;&#xA0;<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>&#xA0;<span class="sunlight-operator">=</span><span class="sunlight-operator">&gt;</span>&#xA0;<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">&apos;HINT:&#xA0;Make&#xA0;sure&#xA0;you&#xA0;wait&#xA0;for&#xA0;the&#xA0;storage&#xA0;to&#xA0;update&#xA0;before&#xA0;sending&#xA0;the&#xA0;next&#xA0;extrinsic&apos;</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span>
&#xA0;&#xA0;<span class="sunlight-operator">.</span><span class="sunlight-keyword">finally</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">_</span>&#xA0;<span class="sunlight-operator">=</span><span class="sunlight-operator">&gt;</span>&#xA0;<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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