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<a class="nav-item subtitle-text" href="https://gradecoin.xyz/jwt/">JWT</a>
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<a class="subtext" href="https://gradecoin.xyz/jwt/#how">How?</a>
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<a class="subtext" href="https://gradecoin.xyz/jwt/#algorithm">Algorithm</a>
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<a class="subtext" href="https://gradecoin.xyz/jwt/#references">References</a>
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<div class="heading-text">JSON Web Token Documentation</div>
<blockquote>
<p>JSON Web Tokens are representations of claims, or authorization proofs that fit into the <code>Header</code> of HTTP requests.</p>
</blockquote>
<h1 id="how">How?</h1>
<p>JWTs are used as the <a href="https://en.wikipedia.org/wiki/Message_authentication_code">MAC</a> of operations that require authorization:</p>
<ul>
<li>block proposal</li>
<li>transaction proposal.</li>
</ul>
<p>They are send alongside the JSON request body in the <code>Header</code>;</p>
<pre style="background-color:#ffffff;">
<code class="language-html" data-lang="html"><span style="color:#545052;">Authorization: Bearer aaaaaa.bbbbbb.ccccc
</span></code></pre>
<p>Gradecoin uses 3 fields for the JWTs;</p>
<pre style="background-color:#ffffff;">
<code class="language-json" data-lang="json"><span style="color:#545052;">{
"</span><span style="color:#009854;">tha</span><span style="color:#545052;">": "</span><span style="color:#009854;">Hash of the payload, check invididual references</span><span style="color:#545052;">",
"</span><span style="color:#009854;">iat</span><span style="color:#545052;">": "</span><span style="color:#009854;">Issued At, Unix Time</span><span style="color:#545052;">",
"</span><span style="color:#009854;">exp</span><span style="color:#545052;">": "</span><span style="color:#009854;">Expiration Time, epoch</span><span style="color:#545052;">"
}
</span></code></pre>
<ul>
<li><code>tha</code> is explained in <a href="https://gradecoin.xyz/block-docs/">blocks</a> and <a href="https://gradecoin.xyz/transaction-docs/">transactions</a> documentations.</li>
<li><code>iat</code> when the JWT was created in <a href="https://en.wikipedia.org/wiki/Unix_time">Unix Time</a> format</li>
<li><code>exp</code> when the JWT will expire & be rejected in <a href="https://en.wikipedia.org/wiki/Unix_time">Unix Time</a></li>
</ul>
<h1 id="algorithm">Algorithm</h1>
<p>We are using <a href="https://www.rfc-editor.org/rfc/rfc7518.html#section-3.1">RS256</a>, <code>RSASSA-PKCS1-v1_5 using SHA-256</code>. The JWTs you encode with your private RSA key will be decoded using the public key you have authenticated with. You can see how the process works <a href="https://jwt.io/">here</a>.</p>
<h1 id="references">References</h1>
<ul>
<li><a href="https://tools.ietf.org/html/rfc7519">RFC, the ultimate reference</a></li>
<li><a href="https://jwt.io/">JWT Debugger</a></li>
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