About Me:
–I am a thirdyear PhD student in the Applied Crypto Group and am advised by Dan Boneh
–My main research interests are in cryptography, game theory and cryptocurrencies.
–I am the chief scientist at Findora. Findora builds auditable yet private financial networks using advanced cryptography, including some of my own research.
–I am an avid runner and train and compete for Peninsula Distance Club
Publications (Google Scholar):
Cryptography and Cryptocurrencies
 Authors
 Paper
 Talk at Scaling Bitcoin 18
 Slides Technical Slides
 TLDR
 Accumulators are short commitment to a set that support efficient inclusion and exclusion proofs. We present several new batching techniques for accumulators and positional vector commitments in group of unknown order. Our techniques can be used in a stateless blockchain design where all users and miners only require a constant amount of storage. We also present a new vector commitment which can significantly reduce the proof size of IOP instantiations, such as STARKs.
 Authors

B. Bünz, S. Agrawal, M. Zamani and D. Boneh
 Paper
 Slides
 TLDR
 We propose Zether, a private payment mechanism that is compatible with Ethereum and other accountbased payment systems. Zether can provide both confidentiality (by hiding payment amounts) and anonymity (by hiding the identities of senders and recipients). Zether is designed to be interoperable with arbitrary smart contracts to support applications such as sealedbid auctions, private payment channels, stake voting, and confidential proofofstake. Zether uses an extension to Bulletproofs called SigmaBullets which combines Bulletproofs with Sigma protocols.
 Authors
 Paper (Published at CRYPTO 2018)
 Talk by Ben Fisch at Crypto 2018
 TLDR
 We introduce verifiable delay functions (VDFs) which have 3 key properties: They are a functions so for every input there is a unique output. Evaluation incurs a delay, i.e. it takes a significant amount of time even on a highly parallel machine. VDFs are verifiable such that given a proof a verifier can efficiently check that the VDF was evaluated correctly. VDFs have many applications from randomness beacons to proofs of replication and cointossing.
 Authors

B. Bünz, J. Bootle, D. Boneh, Andrew Poelstra, Pieter Wuille and Greg Maxwell
 Paper (Published at IEEE S&P (Oakland) 2018)
 Talk at IEEE S&P
 Slides
 Implementations
 TLDR
 Confidential transactions are Bitcoin transactions which are publicly verifiable but do not reveal the amounts that are transferred. They rely on cryptographic commitments and so called zeroknowledge proofs of knowledge. We present a new kind of zeroknowledge proof which is much more efficient and can be used to drastically reduce the size of confidential transactions. On a more technical note bulletproofs are noninteractive zero knowledge proofs without trusted setup and with only logarithmic proof size. Proving and verification cost are linear with low constant overhead.
 Authors
 Paper (Published at CCS 2015)
 Talk at Next Context Conference
 Implementations
 Blog by Joseph Bonneau
 TLDR
 How can a Bitcoin exchange proof that they have enough funds to satisfy all their customers demands without revealing the customers balances, the bitcoin addresses they control or even the total amount of bitcoin they have.
 Authors

B. Bünz, S. Goldfeder, J. Bonneau
 Paper
 Talk at CESC
 Slides
 Code
 TLDR
 We show how one can generate an unpredictable randomness beacon that is publicly verifiable using a blockchain. The beacon can be used to verify the correct execution of randomized algorithms such as lotteries. The novel property of the beacon is that it is publicly verifiable in that a verifier is convinced that the beacon was unpredictable even if she did not partake in the generation of the beacon and without any trust assumptions. We also show how we can enable interactive verification using an efficient smart contract.
Game Theory (Combinatorial Auctions)
 Authors
 Paper (Published at AAAI 2015)
 Slides
 TLDR
 We significantly improve on the current state of the art algorithm for computing combinatorial auctions. These auctions were multiple related goods are sold in the same auction are for example used to allocated spectrum to cellular companies around the world. These auctions often generate billions of dollars in revenue but are often limited to a small number of bidders and goods. Faster algorithms for computing their outcome will enable larger scale applications.
 Authors

V. Bosshard, B. Bünz, B. Lubin, S. Seuken
 Paper (Published at IJCAI 2017)
 TLDR
 We design several new techniques for quickly computing bayes nash equilibria for combinatorial auctions.
Artificial Intelligence
 Authors

D. Selsam, M. Lamm, B. Bünz, P. Liang, L. de Moura,D. Dill
 Paper (To appear at ICLR 2019)
 Talk by Daniel Selsam at Microsoft Research
 [Code](https://github.com/dselsam/neurosat)
 TLDR
 We develop a neural network based solver for finding satisfying assignments to boolean formulas (SAT solver). At training time the network is given satisfying formulas and only the information of whether the formula has a solution or not. Despite this minimal supervision we are able to directly read of satisfying assignments from the activations of the network if it classifies a formula as satisfiable. Additionally we can even find contradictions if the formula is unsatisfiable. Given that classifying boolean formulas is an NPcomplete problem this an interesting exploration into the abilities and flexibilities of neural network and also raises interesting possibilities of using neural networks in the development of state of the art SAT solvers.