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<!DOCTYPE html>
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<meta name="author" content="Johan Pouwelse" >
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<a class="page-scroll" href="#blockchain">Blockchain</a>
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<a class="page-scroll" href="#aboutus">About Us</a>
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<a class="page-scroll" href="#team">The Team</a>
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<div class="intro-heading">Blockchain Lab</div>
<div class="intro-lead-in">Delft University of Technology, The Netherlands</div>
<div class="intro-lead-in intro-lead-in-last">Established 29 August 2007</div>
</div>
</div>
</header>
<!-- Services Section -->
<section id="blockchain">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center">
<h2 class="section-heading">Goal: re-inventing trust and money</h2>
<h3 class="section-subheading text-muted">TU Delft is home to the one of the largest research groups on blockchain technology.
Our work combines running code with novel approaches to broaden and strengthen the cybercurrency field.
We aim to provide a secure, scalable, cybercurrency without forks and without the need for confirmations. </h3>
</div>
</div>
<div class="row text-center">
<div class="col-md-3">
<span class="fa-stack fa-3x">
<i class="fa fa-circle fa-stack-2x text-primary"></i>
<i class="fa fa-copyright fa-stack-1x fa-inverse"></i>
</span>
<h4 class="service-heading">Open Source</h4>
<p class="text-muted">We are a non-profit lab. We openly share all our findings and refrain from patenting our technology. All our work is shared with the open source community.</p>
</div>
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<h4 class="service-heading">Early Pioneers</h4>
<p class="text-muted">Our '<a href="https://news.harvard.edu/gazette/story/2007/08/creating-a-computer-currency/">Bandwidth as a Currency</a>' research from 2007 together with Harvard University spearheaded approaches with unbounded scalability. <br> <a href="https://news.bbc.co.uk/2/hi/technology/6971904.stm">BBC News article</a>.</p>
</div>
<div class="col-md-3">
<span class="fa-stack fa-3x">
<i class="fa fa-circle fa-stack-2x text-primary"></i>
<i class="fa fa-balance-scale fa-stack-1x fa-inverse"></i>
</span>
<h4 class="service-heading">Ethical Blockchain</h4>
<p class="text-muted">Wide-spread acceptance requires a new form of governance: self-governance. This is challenging as even democracy is still a contested concept with a variety of norms.</p>
</div>
<div class="col-md-3">
<span class="fa-stack fa-3x">
<i class="fa fa-circle fa-stack-2x text-primary"></i>
<i class="fa fa-eye fa-stack-1x fa-inverse"></i>
</span>
<h4 class="service-heading">Enhance Privacy</h4>
<p class="text-muted">Privacy is eroding. The Tor project addresses this issue and we are conducting trials with blockchain technology that rewards people who donate their bandwidth.</p>
</div>
</div>
</div>
</section>
<!-- About us Section -->
<section id="aboutus">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center">
<h2 class="section-heading">About us</h2>
<h3 class="section-subheading text-muted">
<div class="col-lg-12 text-center">
<p class="large text-muted">Delft University of Technology has numerous young, motivated and skilled students at phd, msc, and bsc level working in the Blockchain Lab. </p>
<p class="large text-muted">Our research is fundamental, aimed at the development and evaluation of new generic blockchain concepts, and application-driven,
motivated by important application areas, such as transaction processing, e-commerce, and logistics.
Much of it is experimental, validating the proposed new concepts by means of implementation and deployment in prototypes that are used in the real world.</p>
</div>
<div class="col-lg-12 text-center">
<img class="img-responsive img-centered" src="img/team/blockchainteam_small.jpg" alt="team picture">
</div>
</div>
</div>
</div>
</section>
<!-- Team Section -->
<section id="team" class="bg-light-gray">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center">
<h2 class="section-heading">Faculty Team</h2>
<!--<h3 class="section-subheading text-muted">The following people support the Blockchain Lab.</h3> -->
</div>
</div>
<div class="row">
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/1.jpg" class="img-responsive img-circle" width="70%" alt="">
<h4>Dr. Ir. Johan Pouwelse</h4>
<p class="text-muted">Associate professor, PI</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/zeki.png" class="img-responsive img-circle" width="63%" alt="">
<h4>Dr. Zeki Erkin</h4>
<p class="text-muted">Assistant Professor, Cryptography expert</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/3.jpg" class="img-responsive img-circle" width="55%" alt="">
<h4>Prof. Dr. Dick Epema</h4>
<p class="text-muted">Section head, Distributed systems</p>
</div>
</div>
</div>
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<div class="col-sm-4">
<div class="team-member">
<img src="img/team/jeroen.png" class="img-responsive img-circle" width="75%" alt="">
<h4>Prof. Dr. Jeroen van den Hoven</h4>
<p class="text-muted">Dean of TPM at TU Delft, Ethics expert</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/dirk.jpg" class="img-responsive img-circle" width="70%" alt="">
<h4>Prof. Dr. Dirk Helbing</h4>
<p class="text-muted">Professor of Computational Social Science</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/rini.jpg" class="img-responsive img-circle" width="60%" alt="">
<h4>Prof. Dr. Ir. Rini van Solingen</h4>
<p class="text-muted">Professor of Global Software Engineering</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/zhijie.jpg" class="img-responsive img-circle" width="57%" alt="">
<h4>Dr. Zhijie Ren</h4>
<p class="text-muted">Postdoc</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/quinten.png" class="img-responsive img-circle" width="55%" alt="">
<h4>Quinten Stokkink</h4>
<p class="text-muted">PhD Student</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/martijn.jpg" class="img-responsive img-circle" width="60%" alt="">
<h4>Martijn de Vos</h4>
<p class="text-muted">PhD Student</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/oguzhan.jpg" class="img-responsive img-circle" width="68%" alt="">
<h4>Oguzhan Ersoy</h4>
<p class="text-muted">PhD Student</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/egbert.jpg" class="img-responsive img-circle" width="72%" alt="">
<h4>Egbert Bouman</h4>
<p class="text-muted">Senior Developer</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/vadim.jpg" class="img-responsive img-circle" width="50%" alt="">
<h4>Vadim Bulavintsev</h4>
<p class="text-muted">Developer</p>
</div>
</div>
<div class="col-sm-4">
<div class="team-member">
<img src="img/team/sandip.jpg" class="img-responsive img-circle" width="58%" alt="">
<h4>Sandip Pandey</h4>
<p class="text-muted">Developer</p>
</div>
</div>
</div>
</div>
</section>
<!-- Scale Section -->
<section id="scalability">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center center-block">
<h2 class="section-heading">Next-generation: Trust and Scalability</h2>
<p class="large text-muted">Despite the elegance and popularity of Bitcoin, it has a fundamental problem and is
extremely wasteful. Today the default Bitcoin software is hard-limited to only 7 transactions
per second globally. All current Bitcoin transactions could be handled by a single 100 Euro
smartphone if creation of trust and global consensus did not require an extremely wasteful
mechanism.</p>
<img src="img/multichain.png" class="img-responsive img-rounded img-centered" alt="">
<p class="large text-muted">Shown above is our graph-based datastructure for next-generation blockchains. Cardinal design principles are that global operations do not scale, global persistent transaction broadcasts should be avoided, transactions spread to a subset of participants are still irrefutable, and each participant issues and maintains their own blockchain.
</p>
<p class="large text-muted">Our scalable approach is based on creating trust. It is inspired by traditional equity and bond issues in which the credit quality or probability of payback is essential. We automated the role of credit rating agencies for evaluating the credit quality of each issued individual blockchain.
</p>
<p class="large text-muted">Our scalable blockchain is based on tamper-proof secure timelines and
graph-based data structure, instead of a blockchain used in Bitcoin.
For the past 9 years we have focussed on the scalability of cybercurrency and efficient mechanisms for building trust.
Our electronic currency design is scalable, prevents the double spending problem, supports offline payments between
trusting parties, and does not require controlling servers, central authority or oversight. Key
breakthrough of our ongoing work is a proof-of-work mechanism allows nodes to reach a secure, tamper-resistant consensus.
</p>
</div>
</div>
</div>
</section>
<!-- Projects Section -->
<section id="projects">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center">
<h2 class="section-heading">Blockchain Based Identity</h2>
<div class="col-lg-12 text-center">
<p class="large text-muted"> Find out how blockchain is enabling self sovereign identity.<br/>
<a href="./trust/index.html"><span class="fa-stack fa-3x">
<i class="fa fa-circle fa-stack-2x"></i>
<i class="fa fa-id-card fa-stack-1x fa-inverse"></i>
</span></a>
</div>
</div>
</div>
</div>
</section>
<!-- Projects Section -->
<section id="projects">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center">
<h3 class="section-heading">All our work is available in Github</h2>
<div class="col-lg-12 text-center">
<p class="large text-muted">Ongoing projects focus primarily on blockchain scalability and applications with Trustchain, self-sovereign identities (SSI) and decentralized marketplaces for bandwidth trading. For an extensive list of our ongoing, finished and future projects, see on Github.<br/>
<a href="https://github.com/Tribler/tribler/wiki#current-items-under-active-development"><i class="fab fa fa-5x fa-github-square"></i></a><span</p>
</div>
</div>
</div>
</div>
</section>
<!-- Pubs Section -->
<section id="publications">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center">
<h2 class="section-heading">Key publications</h2>
<p class="large text-muted text-left">
<a href="https://tools.ietf.org/html/draft-pouwelse-trustchain-01">Trustchain protocol [IETF Internet Draft]</a> <br>
<a href="http://pure.tudelft.nl/ws/files/41225519/article.pdf">Laws for Creating Trust in the Blockchain Age</a> <br>
<a href="http://www.sciencedirect.com/science/article/pii/S0167739X17318988">TrustChain: A Sybil-resistant scalable blockchain</a> (<a href="img/trustchain_poster.pdf" target="_blank">poster</a>)<br>
<a href="https://arxiv.org/abs/1712.07564">Transaction Propagation on Permissionless Blockchains: Incentive and Routing Mechanisms</a> <br>
<a href="https://arxiv.org/abs/1801.02531">A Scale-out Blockchain for Value Transfer with Spontaneous Sharding</a> <br>
<a href="https://dl.eusset.eu/handle/20.500.12015/3156">TRADE: A Transparent, Decentralized Traceability System for the Supply Chain</a> <br>
<a href="https://repository.tudelft.nl/islandora/object/uuid:86b2d4d8-642e-4d0f-8fc7-d7a2e331e0e9">A Blockchain Consensus Protocol With Horizontal Scalability</a> <br>
<a href="http://dx.doi.org/10.1109/P2P.2010.5569984">Scientific article of our trial in partnership with Wikipedia.org of 'Bandwidth as a Currency'.</a> <br>
<a href="http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7145334">Decentralized credit mining systems</a> <br>
<a href="http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6663517">A network science perspective of a distributed reputation mechanism</a> (reputation-based approach against double spending) <br>
<a href="http://link.springer.com/chapter/10.1007/978-3-662-47854-7_26">An Entry-Guard-based Payment System for Tor</a> <br>
<a href="http://link.springer.com/chapter/10.1007/978-3-642-45249-9_20">Towards a peer-to-peer bandwidth marketplace</a> <br>
<a href="http://www.eecs.harvard.edu/~seuken/publications/AccountingMechanisms_Seuken10.pdf">Work accounting mechanisms: Theory and practice</a> (joined work by TUDelft, Harvard, and Berkeley)<br>
<a href="http://arxiv.org/pdf/1406.5440">Operational Distributed Regulation for Bitcoin</a> <br>
<a href="https://arxiv.org/pdf/1505.07370">Anonymous online purchases with exhaustive operational security</a> <br>
</p>
</div>
</div>
</div>
</section>
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Our research challenge is moving beyond the classical wasteful "proof-of-something" approach.</p>
<p class="text-muted">Another milestone for the lab was the cooperation with Wikipedia.org website, further expanding our "bandwidth as a currency" work. Within this partnership we deployed a browser plugin which enables users to donate bandwidth to the Wikipedia website.</p>
-->
<section id="contact" class="bg-light-gray">
<div class="container">
<div class="row">
<div class="col-lg-12 text-center">
<h2 class="section-heading">Contact</h2>
<p>Van Mourik Broekmanweg 6, 2628 XE, Delft</p>
<p>3rd floor</p>
<p>The Netherlands</p>
<!--<h3 class="section-subheading text-muted">The following people support the Blockchain Lab.</h3> -->
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</section>
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