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1<!doctype html>
2<title>404 Not Found</title>
3<h1>404 Not Found</h1>
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diff --git a/site/public/block-docs/index.html b/site/public/block-docs/index.html
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1<!DOCTYPE html>
2<html lang="en">
3
4<head>
5 <meta charset="UTF-8">
6 <title>Blocks | Gradecoin </title>
7 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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28
29<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.1.1/animate.min.css" />
30<link rel="stylesheet" href="/site.css" />
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32</head>
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34<body>
35
36<header class="box-shadow">
37
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39<a href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;">
40 <div class="logo">
41 <img src="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;gradecoin.png" alt="logo">
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43 </div>
44</a>
45
46<nav>
47
48 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;register-docs&#x2F;">Register</a>
49
50 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
51
52 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
53
54 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
55
56 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;misc-docs&#x2F;">Misc</a>
57
58
59
60 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
61
62
63</nav>
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65</header>
66
67
68 <main>
69
70
71
72
73
74 <div class="toc">
75 <div class="toc-sticky">
76
77 <div class="toc-item">
78 <a class="subtext" href="https://gradecoin.xyz/block-docs/#requests">Requests</a>
79 </div>
80
81
82 <div class="toc-item-child">
83 <a class="subtext" href="https://gradecoin.xyz/block-docs/#get"><small>- GET</small></a>
84 </div>
85
86 <div class="toc-item-child">
87 <a class="subtext" href="https://gradecoin.xyz/block-docs/#post"><small>- POST</small></a>
88 </div>
89
90
91
92 <div class="toc-item">
93 <a class="subtext" href="https://gradecoin.xyz/block-docs/#fields">Fields</a>
94 </div>
95
96
97 <div class="toc-item">
98 <a class="subtext" href="https://gradecoin.xyz/block-docs/#mining">Mining</a>
99 </div>
100
101
102 <div class="toc-item">
103 <a class="subtext" href="https://gradecoin.xyz/block-docs/#hash">Hash</a>
104 </div>
105
106
107 </div>
108 </div>
109
110
111
112 <div class="content text">
113
114<div class="heading-text">Block Documentation</div>
115<p>A block that was proposed to commit Transactions in <code>transaction_list</code> to the
116ledger with a nonce that made <code>hash</code> valid; 6 zeroes at the left hand side of the
117hash (24 bytes).</p>
118<p>We are <em>mining</em> using <a href="https://www.blake2.net/">blake2s</a> algorithm, which produces 256 bit hashes. Hash/second is roughly 20x10<sup>3</sup> on my machine, a new block can be mined in around 4-6 minutes.</p>
119<h1 id="requests">Requests</h1>
120<h2 id="get">GET</h2>
121<p>A HTTP <code>GET</code> request to <a href="/block">/block</a> endpoint will return the latest mined block.</p>
122<h2 id="post">POST</h2>
123<p>A HTTP <code>POST</code> request with Authorization using JWT will allow you to propose your own blocks.</p>
124<h1 id="fields">Fields</h1>
125<pre style="background-color:#ffffff;">
126<code><span style="color:#545052;">transaction_list: [array of Fingerprints]
127nonce: unsigned 32-bit integer
128timestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;
129hash: String
130</span></code></pre><h1 id="mining">Mining</h1>
131<p>The <em>mining</em> process for the hash involves;</p>
132<ul>
133<li>Creating a temporary JSON object with <code>transaction_list</code>, <code>timestamp</code> and <code>nonce</code> values</li>
134<li>Serializing it</li>
135<li>Calculating blake2s hash of the serialized string</li>
136</ul>
137<p>If the resulting hash is valid, then you can create a <code>Block</code> JSON object with the found <code>nonce</code> and <code>hash</code>.</p>
138<h1 id="hash">Hash</h1>
139<p><code>tha</code> field in <a href="/jwt">jwt documentation</a> in fact stands for &quot;The Hash&quot;, in the case of a post request for a block, you need to use hash field of the block.</p>
140<p><a href="https://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations">ISO 8601 Reference</a></p>
141
142
143 </div>
144
145
146
147 </main>
148
149
150<footer>
151Built For ⁂ CENG489 ⁂ Introduction to Computer Security
152</footer>
153
154</body>
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diff --git a/site/public/elasticlunr.min.js b/site/public/elasticlunr.min.js
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1/**
2 * elasticlunr - http://weixsong.github.io
3 * Lightweight full-text search engine in Javascript for browser search and offline search. - 0.9.6
4 *
5 * Copyright (C) 2017 Oliver Nightingale
6 * Copyright (C) 2017 Wei Song
7 * MIT Licensed
8 * @license
9 */
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1<!DOCTYPE html>
2<html lang="en">
3
4<head>
5 <meta charset="UTF-8">
6 <title>Gradecoin</title>
7 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
8 <style>
9 :root {
10 /* Primary theme color */
11 --primary-color: #F8D12F;
12 /* Primary theme text color */
13 --primary-text-color: #1E2329;
14 /* Primary theme link color */
15 --primary-link-color: #2F57F7;
16 /* Secondary color: the background body color */
17 --secondary-color: #FAFAFA;
18 --secondary-text-color: #303030;
19 /* Highlight text color of table of content */
20 --toc-highlight-text-color: #d46e13;
21 }
22</style>
23
24 <link href="https://fonts.googleapis.com/css?family=Alfa+Slab+One&display=swap" rel="stylesheet">
25 <link href="https://fonts.googleapis.com/css?family=Fira+Sans:400,500,600&display=swap" rel="stylesheet">
26 <link rel="stylesheet" href="/normalize.css">
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31
32</head>
33
34<body>
35
36
37 <header class="pos-absolute" style="background-color: transparent">
38
39
40<a href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;">
41 <div class="logo">
42 <img src="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;gradecoin.png" alt="logo">
43 Gradecoin
44 </div>
45</a>
46
47<nav>
48
49 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;register-docs&#x2F;">Register</a>
50
51 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
52
53 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
54
55 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
56
57 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;misc-docs&#x2F;">Misc</a>
58
59
60
61 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
62
63
64</nav>
65
66 </header>
67
68 <div class="hero">
69
70
71<section class="text-center">
72 <h1 class="heading-text animate__animated animate__jackInTheBox" style="font-size: 50px">
73 Mine your own grades
74 </h1>
75 <h3 class="title-text">
76 <b>Gradecoin</b> is the latest cutting edge blockchain technology agile grading framework that drives organic engagement and other buzzwords, with big data mining search engine optimization
77 </h3>
78 <div>
79 </div>
80</section>
81<img class="hero-image" style="width: 40%" src="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;gradecoin.png">
82
83<div class="explore-more text"
84 onclick="document.getElementById('features').scrollIntoView({behavior: 'smooth'})">
85 ⇩ Learn How ⇩
86</div>
87
88<style>
89
90.hero section {
91 padding: 0 5rem;
92}
93
94@media screen and (max-width: 768px) {
95 .hero section {
96 padding: 0 2rem;
97 }
98
99 .hero-image {
100 display: none
101 }
102
103}
104footer {
105 color: #8b8b8b;
106}
107</style>
108
109 </div>
110
111
112
113 <main>
114
115
116
117
118
119 <div class="toc">
120 <div class="toc-sticky">
121
122 <div class="toc-item">
123 <a class="subtext" href="https://gradecoin.xyz/#welcome-to-gradecoin">Welcome to Gradecoin!</a>
124 </div>
125
126
127 <div class="toc-item">
128 <a class="subtext" href="https://gradecoin.xyz/#coinbase">Coinbase</a>
129 </div>
130
131
132 <div class="toc-item">
133 <a class="subtext" href="https://gradecoin.xyz/#public-key-signatures">Public Key Signatures</a>
134 </div>
135
136
137 <div class="toc-item">
138 <a class="subtext" href="https://gradecoin.xyz/#services">Services</a>
139 </div>
140
141
142 <div class="toc-item-child">
143 <a class="subtext" href="https://gradecoin.xyz/#register"><small>- &#x2F;register</small></a>
144 </div>
145
146 <div class="toc-item-child">
147 <a class="subtext" href="https://gradecoin.xyz/#transaction"><small>- &#x2F;transaction</small></a>
148 </div>
149
150 <div class="toc-item-child">
151 <a class="subtext" href="https://gradecoin.xyz/#block"><small>- &#x2F;block</small></a>
152 </div>
153
154 <div class="toc-item-child">
155 <a class="subtext" href="https://gradecoin.xyz/#user"><small>- &#x2F;user</small></a>
156 </div>
157
158
159
160 <div class="toc-item">
161 <a class="subtext" href="https://gradecoin.xyz/#questions">Questions</a>
162 </div>
163
164
165 <div class="toc-item-child">
166 <a class="subtext" href="https://gradecoin.xyz/#this-all-sound-complicated"><small>- This all sound complicated!</small></a>
167 </div>
168
169 <div class="toc-item-child">
170 <a class="subtext" href="https://gradecoin.xyz/#how-do-you-actually-earn-gradecoin"><small>- How do you actually earn Gradecoin?</small></a>
171 </div>
172
173 <div class="toc-item-child">
174 <a class="subtext" href="https://gradecoin.xyz/#i-found-a-bug"><small>- I found a bug!</small></a>
175 </div>
176
177 <div class="toc-item-child">
178 <a class="subtext" href="https://gradecoin.xyz/#i-hacked-the-server"><small>- I hacked the server!</small></a>
179 </div>
180
181 <div class="toc-item-child">
182 <a class="subtext" href="https://gradecoin.xyz/#submission"><small>- Submission?</small></a>
183 </div>
184
185 <div class="toc-item-child">
186 <a class="subtext" href="https://gradecoin.xyz/#can-my-friends-play"><small>- Can my friends play?</small></a>
187 </div>
188
189 <div class="toc-item-child">
190 <a class="subtext" href="https://gradecoin.xyz/#how-and-or-why"><small>- How and or Why?</small></a>
191 </div>
192
193
194
195 </div>
196 </div>
197
198
199
200 <div class="content text">
201
202<div class="tcontainer" id="features">
203 <div class="ticker-wrap">
204 <div class="ticker-move">
205 <div class="ticker-item"><b>News:</b></div>
206 <div class="ticker-item">Gradecoin is in testnet mode, API is not stable, everything might reset at any time.</div>
207 <div class="ticker-item">Transactions are now unique according to their "by" field, sorry for the trouble</div>
208 <div class="ticker-item">Blocks now require 5 transactions in them, during testnet phase</div>
209 <div class="ticker-item">It was possible (and hilarious) to mine a new block with just 1 transaction, it is now fixed</div>
210 </div>
211 </div>
212</div>
213<h1 id="welcome-to-gradecoin">Welcome to Gradecoin!</h1>
214<p>Blockchains are incredibly simple yet can appear very complicated, we will see how they work and practice programming <em>production</em> cryptography code.</p>
215<p>This server is the sandbox for the PA1, it's currently running the Gradecoin application. Gradecoin is the faux currency we will use to simulate a blockchain network. At the end of the simulation, the amount of Gradecoin you hold will be your PA1 grade.</p>
216<p><strong>A quick summary</strong>: authenticate yourself to the system using public key encryption.
217Craft <a href="https://gradecoin.xyz/transaction-docs/">Transaction</a> proposals and tag them using <a href="https://gradecoin.xyz/jwt/">JWTs</a>.
218When there are enough transactions then you can propose <a href="https://gradecoin.xyz/block-docs/">Blocks</a> in the same way.
219Blocks need to be <em>mined</em> beforehand using Proof-of-work, or brute force.</p>
220<p>Gradecoin offers 3 endpoints at <a href="/register">/register</a>, <a href="/block">/block</a> and <a href="/transaction">/transaction</a>. You can only send GET requests to /block and /transaction without authorization.
221The server is programmed in <a href="https://www.service-architecture.com/articles/web-services/representational_state_transfer_rest.html">RESTful</a> architecture, there are no <code>DELETE</code>, <code>PUT</code> or <code>UPDATE</code> operations, though.</p>
222<p>Gradecoin uses a Proof-of-work block accepting mechanism. It uses single round <a href="https://www.blake2.net/">Blake2s</a> hashing which produces 256-bit (64 hexadecimal characters) output. The <a href="https://wiki.bitcoinsv.io/index.php/Target">target</a> hash is <em>24 bits</em> or <em>6 hexadecimal characters</em> of 0. During testing, I could mine a block on average around 4-6 minutes.</p>
223<blockquote>
224<p>We're expecting you to use existing tools and implementations. Standards are hard. <a href="https://www.reddit.com/r/crypto/comments/2coqsy/dont_roll_your_own/">Don't roll your own crypto</a>. Feel free to ask questions. Collaborate.</p>
225</blockquote>
226<p>You might ask,</p>
227<blockquote>
228<p>But if nobody has any Gradecoin then how do we have transactions?</p>
229</blockquote>
230<p>There is a bank! Their public key is <code>31415926535897932384626433832795028841971693993751058209749445923</code> and they have some amount of Gradecoin preloaded. It's also the only account that you can send transactions requests <em>to</em> yourself.</p>
231<h1 id="coinbase">Coinbase</h1>
232<p>The first transactions of a block is called the <code>coinbase</code>. They are the <strong>author</strong> of the block proposal and if the block is accepted then they get compensated for their efforts with some Gradecoin.</p>
233<h1 id="public-key-signatures">Public Key Signatures</h1>
234<p>Gradecoin uses 2048 bit RSA keypairs.</p>
235<h1 id="services">Services</h1>
236<h2 id="register">/register</h2>
237<ul>
238<li>Create your own 2048 bit RSA <code>keypair</code></li>
239<li>Download <code>Gradecoin</code>'s Public Key from <a href="https://odtuclass.metu.edu.tr/my/">Moodle</a></li>
240<li>Encrypt your <a href="https://www.json.org/json-en.html">JSON</a> wrapped <code>Public Key</code>, <code>Student ID</code> and one time <code>passwd</code> using Gradecoin's Public Key</li>
241<li>Your public key is now in our database and can be used to sign your JWT's during requests</li>
242<li>For more information, check the <a href="https://gradecoin.xyz/register-docs/">register</a> page</li>
243</ul>
244<h2 id="transaction">/transaction</h2>
245<ul>
246<li>You can offer a <a href="https://gradecoin.xyz/transaction-docs/">Transaction</a> with a POST request
247<ul>
248<li>The request should have <code>Authorization</code></li>
249<li>The request header should be signed by the Public Key of the <code>by</code> field in the transaction</li>
250</ul>
251</li>
252<li>Fetch the list of <code>Transaction</code>s with a GET request</li>
253<li>For more information, check our <a href="https://gradecoin.xyz/transaction-docs/">transaction</a> page</li>
254</ul>
255<h2 id="block">/block</h2>
256<ul>
257<li>
258<p>Offer a <a href="https://gradecoin.xyz/block-docs/">Block</a> with a POST request</p>
259<ul>
260<li>The request should have <code>Authorization</code></li>
261<li>The <code>transaction_list</code> of the block should be a subset of pending transactions, available on <a href="/transaction">/transaction</a></li>
262</ul>
263</li>
264<li>
265<p>Fetch the last accepted <code>Block</code> with a GET request</p>
266</li>
267<li>
268<p>For more information, check our <a href="https://gradecoin.xyz/block-docs/">block</a> page</p>
269<p><code>Authorization</code>: The request header should have Bearer JWT.Token signed with Student Public Key</p>
270</li>
271</ul>
272<h2 id="user">/user</h2>
273<ul>
274<li>Meant to be used in the browser, you can see the current list of users and their balance here</li>
275</ul>
276<h1 id="questions">Questions</h1>
277<h2 id="this-all-sound-complicated">This all sound complicated!</h2>
278<ul>
279<li>I've drawn inspiration from <a href="https://explorer.bitcoin.com/btc">actual Bitcoin transactions</a> and <a href="https://github.com/seanmonstar/warp/blob/master/examples/todos.rs">warp</a>. The simplicity of the system is how little interfaces it has.</li>
280<li>Don't know where to start? Gradecoin uses RESTful API; simple <code>curl</code> commands or even your browser will work! <a href="https://curl.trillworks.com/">This website can help as well</a>.</li>
281<li><a href="https://jwt.io">JWT Debugger</a> and the corresponding <a href="https://tools.ietf.org/html/rfc7519">RFC</a>.</li>
282<li>Remember that you are absolutely encouraged to grab off-the-shelf implementations for every cryptography primitive you will use. You can start by finding a code snippet to generate a RSA keypair?</li>
283<li>Check out <a href="https://gradecoin.xyz/misc-docs/">misc</a> for everything else you might be curious about.</li>
284</ul>
285<h2 id="how-do-you-actually-earn-gradecoin">How do you actually earn Gradecoin?</h2>
286<ul>
287<li>Register yourself to at <a href="https://gradecoin.xyz/register-docs/">/register</a></li>
288<li>Create transactions at <a href="https://gradecoin.xyz/transaction-docs/">/transaction</a></li>
289<li>Create blocks to commit transactions at <a href="https://gradecoin.xyz/block-docs/">/block</a></li>
290<li>See how everyone is doing and find people to trade with at <a href="/user">/user</a></li>
291</ul>
292<h2 id="i-found-a-bug">I found a bug!</h2>
293<p>Thank you! Please <a href="mailto:yigit@ceng.metu.edu.tr">let me know</a> so we can solve it.</p>
294<h2 id="i-hacked-the-server">I hacked the server!</h2>
295<p>That wasn't supposed to happen :( I did not place any intentional vulnerabilities to the system so if you cracked something, it was not intended. Please don't abuse it and let me know so I can patch it.</p>
296<h2 id="submission">Submission?</h2>
297<p>At the end of the <em>simulation</em>, your Gradecoin balance will be your grade. I will also expect a unique client programmed in either;</p>
298<ul>
299<li>c</li>
300<li>c++</li>
301<li>perl</li>
302<li>rust</li>
303<li>python</li>
304<li>random assortment of bash scripts</li>
305</ul>
306<p>If your favourite programming language is missing please let me know 🤷?</p>
307<h2 id="can-my-friends-play">Can my friends play?</h2>
308<p>Sadly, no. Student's who are enrolled to the class will receive one-time-passwords for authentication.</p>
309<h2 id="how-and-or-why">How and or Why?</h2>
310<ul>
311<li><a href="https://xkcd.com/2314/">Built</a>, <a href="https://lofi.cafe/">with</a> <a href="https://xkcd.com/2418/">Rust</a></li>
312</ul>
313
314
315 </div>
316
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diff --git a/site/public/jwt/index.html b/site/public/jwt/index.html
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78 <a class="subtext" href="https://gradecoin.xyz/jwt/#how">How?</a>
79 </div>
80
81
82 <div class="toc-item">
83 <a class="subtext" href="https://gradecoin.xyz/jwt/#algorithm">Algorithm</a>
84 </div>
85
86
87 <div class="toc-item">
88 <a class="subtext" href="https://gradecoin.xyz/jwt/#references">References</a>
89 </div>
90
91
92 </div>
93 </div>
94
95
96
97 <div class="content text">
98
99<div class="heading-text">JSON Web Token Documentation</div>
100<blockquote>
101<p>JSON Web Tokens are representations of claims, or authorization proofs that fit into the <code>Header</code> of HTTP requests.</p>
102</blockquote>
103<h1 id="how">How?</h1>
104<p>JWTs are used as the <a href="https://en.wikipedia.org/wiki/Message_authentication_code">MAC</a> of operations that require authorization:</p>
105<ul>
106<li>block proposal</li>
107<li>transaction proposal.</li>
108</ul>
109<p>They are send alongside the JSON request body in the <code>Header</code>;</p>
110<pre style="background-color:#ffffff;">
111<code class="language-html" data-lang="html"><span style="color:#545052;">Authorization: Bearer aaaaaa.bbbbbb.ccccc
112</span></code></pre>
113<p>Gradecoin uses 3 fields for the JWTs;</p>
114<pre style="background-color:#ffffff;">
115<code class="language-json" data-lang="json"><span style="color:#545052;">{
116&quot;</span><span style="color:#009854;">tha</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">Hash of the payload, check invididual references</span><span style="color:#545052;">&quot;,
117&quot;</span><span style="color:#009854;">iat</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">Issued At, Unix Time</span><span style="color:#545052;">&quot;,
118&quot;</span><span style="color:#009854;">exp</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">Expiration Time, epoch</span><span style="color:#545052;">&quot;
119}
120</span></code></pre>
121<ul>
122<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>
123<li><code>iat</code> when the JWT was created in <a href="https://en.wikipedia.org/wiki/Unix_time">Unix Time</a> format</li>
124<li><code>exp</code> when the JWT will expire &amp; be rejected in <a href="https://en.wikipedia.org/wiki/Unix_time">Unix Time</a></li>
125</ul>
126<h1 id="algorithm">Algorithm</h1>
127<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>
128<h1 id="references">References</h1>
129<ul>
130<li><a href="https://tools.ietf.org/html/rfc7519">RFC, the ultimate reference</a></li>
131<li><a href="https://jwt.io/">JWT Debugger</a></li>
132</ul>
133
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78 <a class="subtext" href="https://gradecoin.xyz/misc-docs/#fingerprint">Fingerprint</a>
79 </div>
80
81
82 <div class="toc-item-child">
83 <a class="subtext" href="https://gradecoin.xyz/misc-docs/#definition"><small>- Definition</small></a>
84 </div>
85
86 <div class="toc-item-child">
87 <a class="subtext" href="https://gradecoin.xyz/misc-docs/#fingerprint-generation"><small>- Fingerprint Generation</small></a>
88 </div>
89
90
91
92 </div>
93 </div>
94
95
96
97 <div class="content text">
98
99<div class="heading-text">Documentation about everything else</div>
100<p>We thought it might be good to explain some concepts you might have questions about.</p>
101<h1 id="fingerprint">Fingerprint</h1>
102<h2 id="definition">Definition</h2>
103<p>A fingerprint is a 256 bit 64 character hexadecimal user identifier for users. Fingerprints are used in defining users in <a href="https://gradecoin.xyz/transaction-docs/">transactions</a> and <a href="https://gradecoin.xyz/block-docs/">blocks</a>.</p>
104<h2 id="fingerprint-generation">Fingerprint Generation</h2>
105<p>A user's finger print is generated via applying SHA256 sum of the user's public RSA key.</p>
106
107
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235 * 2. Correct the color inheritance from `fieldset` elements in IE.
236 * 3. Remove the padding so developers are not caught out when they zero out
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diff --git a/site/public/register-docs/index.html b/site/public/register-docs/index.html
deleted file mode 100644
index 53d86dd..0000000
--- a/site/public/register-docs/index.html
+++ /dev/null
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1<!DOCTYPE html>
2<html lang="en">
3
4<head>
5 <meta charset="UTF-8">
6 <title>Register | Gradecoin </title>
7 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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25 <link href="https://fonts.googleapis.com/css?family=Fira+Sans:400,500,600&display=swap" rel="stylesheet">
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28
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30<link rel="stylesheet" href="/site.css" />
31
32</head>
33
34<body>
35
36<header class="box-shadow">
37
38
39<a href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;">
40 <div class="logo">
41 <img src="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;gradecoin.png" alt="logo">
42 Gradecoin
43 </div>
44</a>
45
46<nav>
47
48 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;register-docs&#x2F;">Register</a>
49
50 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
51
52 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
53
54 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
55
56 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;misc-docs&#x2F;">Misc</a>
57
58
59
60 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
61
62
63</nav>
64
65</header>
66
67
68 <main>
69
70
71
72
73
74 <div class="toc">
75 <div class="toc-sticky">
76
77 <div class="toc-item">
78 <a class="subtext" href="https://gradecoin.xyz/register-docs/#authentication-process">Authentication Process</a>
79 </div>
80
81
82 <div class="toc-item-child">
83 <a class="subtext" href="https://gradecoin.xyz/register-docs/#cipher-initialization"><small>- Cipher Initialization</small></a>
84 </div>
85
86 <div class="toc-item-child">
87 <a class="subtext" href="https://gradecoin.xyz/register-docs/#encryption"><small>- Encryption</small></a>
88 </div>
89
90
91
92 </div>
93 </div>
94
95
96
97 <div class="content text">
98
99<div class="heading-text">Register Documentation</div>
100<p>POST request to <code>/register</code> endpoint</p>
101<p>Lets a user to authenticate themselves to the system.
102Only people who are enrolled to the class can open Gradecoin accounts.
103This is enforced with your Student ID (e123456) and a one time password you will receive.</p>
104<h1 id="authentication-process">Authentication Process</h1>
105<blockquote>
106<p>The bytes you are sending over the network are all Base64 Encoded</p>
107</blockquote>
108<ul>
109<li>Gradecoin's Public Key (<code>gradecoin_public_key</code>) is listed on our Moodle page and <a href="/gradecoin.pub">here</a>. Download and load it it to your client.</li>
110<li>Create a JSON object (<code>P_AR</code>) with your <code>metu_id</code> (&quot;e&quot;+<code>6 chars</code>) and <code>public key</code> in base64 (PEM) format (<code>S_PK</code>) <a href="https://tls.mbed.org/kb/cryptography/asn1-key-structures-in-der-and-pem">reference</a></li>
111</ul>
112<pre style="background-color:#ffffff;">
113<code class="language-json" data-lang="json"><span style="color:#545052;">{
114 &quot;</span><span style="color:#009854;">student_id</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">e123456</span><span style="color:#545052;">&quot;,
115 &quot;</span><span style="color:#009854;">passwd</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">15 char secret</span><span style="color:#545052;">&quot;,
116 &quot;</span><span style="color:#009854;">public_key</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">---BEGIN PUBLIC KEY...</span><span style="color:#545052;">&quot;
117}
118</span></code></pre><h2 id="cipher-initialization">Cipher Initialization</h2>
119<blockquote>
120<p>Since we are working with AES-128, both key and IV should be 128 bits (or 16 hexadecimal characters)</p>
121</blockquote>
122<ul>
123<li>Pick a short temporary key (<code>k_temp</code>)</li>
124<li>Pick a random IV <a href="https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Initialization_vector_(IV)">1</a> <a href="https://en.wikipedia.org/wiki/Initialization_vector">2</a> (<code>iv</code>).</li>
125</ul>
126<h2 id="encryption">Encryption</h2>
127<ul>
128<li>Encrypt the serialized string of <code>P_AR</code> with 128 bit block <a href="https://en.wikipedia.org/wiki/Initialization_vector">AES</a> in <a href="https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#CBC">CBC</a> mode with <a href="https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Padding">Pkcs7 padding</a> using the temporary key (<code>k_temp</code>), the result is <code>C_AR</code>. Encode this with base64.</li>
129<li>The temporary key you have picked <code>k_temp</code> is encrypted using RSA with <a href="https://en.wikipedia.org/wiki/Optimal_asymmetric_encryption_padding">OAEP</a> padding scheme using SHA-256 with <code>gradecoin_public_key</code>, giving us <code>key_ciphertext</code>. Encode this with base64.</li>
130<li>Base64 encode the IV (<code>iv</code>) as well.</li>
131</ul>
132<blockquote class="tidbit">
133 <p>
134 The available tools and libraries might warn you about how using the primitives given above are &quot;hazardous&quot;. They are, crypto is hard.
135 </p>
136</blockquote>
137<ul>
138<li>The payload JSON object (<code>auth_request</code>) can be serialized now:</li>
139</ul>
140<pre style="background-color:#ffffff;">
141<code class="language-json" data-lang="json"><span style="color:#545052;">{
142 &quot;</span><span style="color:#009854;">c</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">C_AR</span><span style="color:#545052;">&quot;,
143 &quot;</span><span style="color:#009854;">iv</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">iv</span><span style="color:#545052;">&quot;,
144 &quot;</span><span style="color:#009854;">key</span><span style="color:#545052;">&quot;: &quot;</span><span style="color:#009854;">key_ciphertext</span><span style="color:#545052;">&quot;
145}
146</span></code></pre>
147<p>If your authentication process was valid, you will be given access and your public key fingerprint that is your address.
148You can now sign <a href="https://gradecoin.xyz/jwt/">JWTs</a> to send authorized transaction requests.</p>
149
150
151 </div>
152
153
154
155 </main>
156
157
158<footer>
159Built For ⁂ CENG489 ⁂ Introduction to Computer Security
160</footer>
161
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Gradecoin is the faux currency we will use to simulate a blockchain network. At the end of the simulation, the amount of Gradecoin you hold will be your PA1 grade.\nA quick summary: authenticate yourself to the system using public key encryption.\nCraft Transaction proposals and tag them using JWTs.\nWhen there are enough transactions then you can propose Blocks in the same way.\nBlocks need to be mined beforehand using Proof-of-work, or brute force.\nGradecoin offers 3 endpoints at /register, /block and /transaction. You can only send GET requests to /block and /transaction without authorization.\nThe server is programmed in RESTful architecture, there are no DELETE, PUT or UPDATE operations, though.\nGradecoin uses a Proof-of-work block accepting mechanism. It uses single round Blake2s hashing which produces 256-bit (64 hexadecimal characters) output. The target hash is 24 bits or 6 hexadecimal characters of 0. During testing, I could mine a block on average around 4-6 minutes.\n\nWe're expecting you to use existing tools and implementations. Standards are hard. Don't roll your own crypto. Feel free to ask questions. Collaborate.\n\nYou might ask,\n\nBut if nobody has any Gradecoin then how do we have transactions?\n\nThere is a bank! Their public key is 31415926535897932384626433832795028841971693993751058209749445923 and they have some amount of Gradecoin preloaded. It's also the only account that you can send transactions requests to yourself.\nCoinbase\nThe first transactions of a block is called the coinbase. They are the author of the block proposal and if the block is accepted then they get compensated for their efforts with some Gradecoin.\nPublic Key Signatures\nGradecoin uses 2048 bit RSA keypairs.\nServices\n/register\n\nCreate your own 2048 bit RSA keypair\nDownload Gradecoin's Public Key from Moodle\nEncrypt your JSON wrapped Public Key, Student ID and one time passwd using Gradecoin's Public Key\nYour public key is now in our database and can be used to sign your JWT's during requests\nFor more information, check the register page\n\n/transaction\n\nYou can offer a Transaction with a POST request\n\nThe request should have Authorization\nThe request header should be signed by the Public Key of the by field in the transaction\n\n\nFetch the list of Transactions with a GET request\nFor more information, check our transaction page\n\n/block\n\n\nOffer a Block with a POST request\n\nThe request should have Authorization\nThe transaction_list of the block should be a subset of pending transactions, available on /transaction\n\n\n\nFetch the last accepted Block with a GET request\n\n\nFor more information, check our block page\nAuthorization: The request header should have Bearer JWT.Token signed with Student Public Key\n\n\n/user\n\nMeant to be used in the browser, you can see the current list of users and their balance here\n\nQuestions\nThis all sound complicated!\n\nI've drawn inspiration from actual Bitcoin transactions and warp. The simplicity of the system is how little interfaces it has.\nDon't know where to start? Gradecoin uses RESTful API; simple curl commands or even your browser will work! This website can help as well.\nJWT Debugger and the corresponding RFC.\nRemember that you are absolutely encouraged to grab off-the-shelf implementations for every cryptography primitive you will use. You can start by finding a code snippet to generate a RSA keypair?\nCheck out misc for everything else you might be curious about.\n\nHow do you actually earn Gradecoin?\n\nRegister yourself to at /register\nCreate transactions at /transaction\nCreate blocks to commit transactions at /block\nSee how everyone is doing and find people to trade with at /user\n\nI found a bug!\nThank you! Please let me know so we can solve it.\nI hacked the server!\nThat wasn't supposed to happen :( I did not place any intentional vulnerabilities to the system so if you cracked something, it was not intended. Please don't abuse it and let me know so I can patch it.\nSubmission?\nAt the end of the simulation, your Gradecoin balance will be your grade. I will also expect a unique client programmed in either;\n\nc\nc++\nperl\nrust\npython\nrandom assortment of bash scripts\n\nIf your favourite programming language is missing please let me know 🤷?\nCan my friends play?\nSadly, no. Student's who are enrolled to the class will receive one-time-passwords for authentication.\nHow and or Why?\n\nBuilt, with Rust\n\n","id":"https://gradecoin.xyz/","title":"Gradecoin"},"https://gradecoin.xyz/block-docs/":{"body":"A block that was proposed to commit Transactions in transaction_list to the\nledger with a nonce that made hash valid; 6 zeroes at the left hand side of the\nhash (24 bytes).\nWe are mining using blake2s algorithm, which produces 256 bit hashes. Hash/second is roughly 20x103 on my machine, a new block can be mined in around 4-6 minutes.\nRequests\nGET\nA HTTP GET request to /block endpoint will return the latest mined block.\nPOST\nA HTTP POST request with Authorization using JWT will allow you to propose your own blocks.\nFields\ntransaction_list: [array of Fingerprints]\nnonce: unsigned 32-bit integer\ntimestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;\nhash: String\nMining\nThe mining process for the hash involves;\n\nCreating a temporary JSON object with transaction_list, timestamp and nonce values\nSerializing it\nCalculating blake2s hash of the serialized string\n\nIf the resulting hash is valid, then you can create a Block JSON object with the found nonce and hash.\nHash\ntha field in jwt documentation in fact stands for \"The Hash\", in the case of a post request for a block, you need to use hash field of the block.\nISO 8601 Reference\n","id":"https://gradecoin.xyz/block-docs/","title":"Blocks"},"https://gradecoin.xyz/jwt/":{"body":"\nJSON Web Tokens are representations of claims, or authorization proofs that fit into the Header of HTTP requests.\n\nHow?\nJWTs are used as the MAC of operations that require authorization:\n\nblock proposal\ntransaction proposal.\n\nThey are send alongside the JSON request body in the Header;\nAuthorization: Bearer aaaaaa.bbbbbb.ccccc\n\nGradecoin uses 3 fields for the JWTs;\n{\n\"tha\": \"Hash of the payload, check invididual references\",\n\"iat\": \"Issued At, Unix Time\",\n\"exp\": \"Expiration Time, epoch\"\n}\n\n\ntha is explained in blocks and transactions documentations.\niat when the JWT was created in Unix Time format\nexp when the JWT will expire &amp; be rejected in Unix Time\n\nAlgorithm\nWe are using RS256, RSASSA-PKCS1-v1_5 using SHA-256. 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 here.\nReferences\n\nRFC, the ultimate reference\nJWT Debugger\n\n","id":"https://gradecoin.xyz/jwt/","title":"JWT"},"https://gradecoin.xyz/misc-docs/":{"body":"We thought it might be good to explain some concepts you might have questions about.\nFingerprint\nDefinition\nA fingerprint is a 256 bit 64 character hexadecimal user identifier for users. Fingerprints are used in defining users in transactions and blocks.\nFingerprint Generation\nA user's finger print is generated via applying SHA256 sum of the user's public RSA key.\n","id":"https://gradecoin.xyz/misc-docs/","title":"Misc"},"https://gradecoin.xyz/register-docs/":{"body":"POST request to /register endpoint\nLets a user to authenticate themselves to the system.\nOnly people who are enrolled to the class can open Gradecoin accounts.\nThis is enforced with your Student ID (e123456) and a one time password you will receive.\nAuthentication Process\n\nThe bytes you are sending over the network are all Base64 Encoded\n\n\nGradecoin's Public Key (gradecoin_public_key) is listed on our Moodle page and here. Download and load it it to your client.\nCreate a JSON object (P_AR) with your metu_id (\"e\"+6 chars) and public key in base64 (PEM) format (S_PK) reference\n\n{\n \"student_id\": \"e123456\",\n \"passwd\": \"15 char secret\",\n \"public_key\": \"---BEGIN PUBLIC KEY...\"\n}\nCipher Initialization\n\nSince we are working with AES-128, both key and IV should be 128 bits (or 16 hexadecimal characters)\n\n\nPick a short temporary key (k_temp)\nPick a random IV 1 2 (iv).\n\nEncryption\n\nEncrypt the serialized string of P_AR with 128 bit block AES in CBC mode with Pkcs7 padding using the temporary key (k_temp), the result is C_AR. Encode this with base64.\nThe temporary key you have picked k_temp is encrypted using RSA with OAEP padding scheme using SHA-256 with gradecoin_public_key, giving us key_ciphertext. Encode this with base64.\nBase64 encode the IV (iv) as well.\n\n\n \n The available tools and libraries might warn you about how using the primitives given above are \"hazardous\". They are, crypto is hard.\n \n\n\nThe payload JSON object (auth_request) can be serialized now:\n\n{\n \"c\": \"C_AR\",\n \"iv\": \"iv\",\n \"key\": \"key_ciphertext\"\n}\n\nIf your authentication process was valid, you will be given access and your public key fingerprint that is your address.\nYou can now sign JWTs to send authorized transaction requests.\n","id":"https://gradecoin.xyz/register-docs/","title":"Register"},"https://gradecoin.xyz/transaction-docs/":{"body":"A transaction request between source and target to move amount Gradecoin.\nRequests\nGET\nA HTTP GET request to /transaction endpoint will return the current list of pending transactions.\nPOST\nA HTTP POST request with Authorization using JWT to /transaction will allow you to propose your own transactions.\nFields\nby: Fingerprint\nsource: Fingerprint\ntarget: Fingerprint\namount: unsigned 16 bit integer\ntimestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;\nHash\ntha field in jwt documentation in fact stands for \"The Hash\", in the case of a post request for a transaction, you need the Md5 hash of the serialized JSON representation of transaction. The resulting JSON string should look something like;\n{\"by\":\"foo\",\"source\":\"bar\",\"target\":\"baz\",\"amount\":2,\"timestamp\":\"2021-04-18T21:49:00\"}\n\nOr; without any whitespace, separated with : and ,.\nBank\nThere is a bank account with Fingerprint 31415926535897932384626433832795028841971693993751058209749445923\n\n \n First 64 digits of Pi\n \n\nThis is the only account that will let you withdraw from them.\nby: this has to be your Fingerprint\nsource: this can be either you or the bank\ntarget: this can be a valid fingerprint or yourself if source is the bank\n...\n","id":"https://gradecoin.xyz/transaction-docs/","title":"Transactions"}},"docInfo":{"https://gradecoin.xyz/":{"body":424,"title":1},"https://gradecoin.xyz/block-docs/":{"body":120,"title":1},"https://gradecoin.xyz/jwt/":{"body":96,"title":1},"https://gradecoin.xyz/misc-docs/":{"body":36,"title":1},"https://gradecoin.xyz/register-docs/":{"body":173,"title":1},"https://gradecoin.xyz/transaction-docs/":{"body":94,"title":1}},"length":6},"lang":"English"}; \ No newline at end of file
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42 Gradecoin
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44</a>
45
46<nav>
47
48 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;register-docs&#x2F;">Register</a>
49
50 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;jwt&#x2F;">JWT</a>
51
52 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;transaction-docs&#x2F;">Transactions</a>
53
54 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;block-docs&#x2F;">Blocks</a>
55
56 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;gradecoin.xyz&#x2F;misc-docs&#x2F;">Misc</a>
57
58
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60 <a class="nav-item subtitle-text" href="https:&#x2F;&#x2F;github.com&#x2F;zhuowei&#x2F;nft_ptr#why">why?</a>
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68 <main>
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74 <div class="toc">
75 <div class="toc-sticky">
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77 <div class="toc-item">
78 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#requests">Requests</a>
79 </div>
80
81
82 <div class="toc-item-child">
83 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#get"><small>- GET</small></a>
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87 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#post"><small>- POST</small></a>
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92 <div class="toc-item">
93 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#fields">Fields</a>
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97 <div class="toc-item">
98 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#hash">Hash</a>
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100
101
102 <div class="toc-item">
103 <a class="subtext" href="https://gradecoin.xyz/transaction-docs/#bank">Bank</a>
104 </div>
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107 </div>
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113
114<div class="heading-text">Transaction documentation</div>
115<p>A transaction request between <code>source</code> and <code>target</code> to move <code>amount</code> Gradecoin.</p>
116<h1 id="requests">Requests</h1>
117<h2 id="get">GET</h2>
118<p>A HTTP <code>GET</code> request to <a href="/transaction">/transaction</a> endpoint will return the current list of pending transactions.</p>
119<h2 id="post">POST</h2>
120<p>A HTTP <code>POST</code> request with Authorization using JWT to <a href="/transactions">/transaction</a> will allow you to propose your own transactions.</p>
121<h1 id="fields">Fields</h1>
122<pre style="background-color:#ffffff;">
123<code><span style="color:#545052;">by: Fingerprint
124source: Fingerprint
125target: Fingerprint
126amount: unsigned 16 bit integer
127timestamp: ISO 8601 &lt;date&gt;T&lt;time&gt;
128</span></code></pre><h1 id="hash">Hash</h1>
129<p><code>tha</code> field in <a href="https://gradecoin.xyz/jwt/">jwt documentation</a> in fact stands for &quot;The Hash&quot;, in the case of a post request for a transaction, you need the Md5 hash of the serialized JSON representation of transaction. The resulting JSON string should look something like;</p>
130<pre style="background-color:#ffffff;">
131<code><span style="color:#545052;">{&quot;by&quot;:&quot;foo&quot;,&quot;source&quot;:&quot;bar&quot;,&quot;target&quot;:&quot;baz&quot;,&quot;amount&quot;:2,&quot;timestamp&quot;:&quot;2021-04-18T21:49:00&quot;}
132</span></code></pre>
133<p>Or; without any whitespace, separated with <code>:</code> and <code>,</code>.</p>
134<h1 id="bank">Bank</h1>
135<p>There is a <code>bank</code> account with Fingerprint <code>31415926535897932384626433832795028841971693993751058209749445923</code></p>
136<blockquote class="tidbit">
137 <p>
138 First 64 digits of Pi
139 </p>
140</blockquote>
141<p>This is the only account that will let you <em>withdraw</em> from them.</p>
142<pre style="background-color:#ffffff;">
143<code><span style="color:#545052;">by: this has to be your Fingerprint
144source: this can be either you or the bank
145target: this can be a valid fingerprint or yourself if source is the bank
146...
147</span></code></pre>
148
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157Built For ⁂ CENG489 ⁂ Introduction to Computer Security
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