This Week in Blockchain Research Issue #11
|zk Capital||Jun 5, 2019|
Paper of the Week
This work acknowledges the importance of having structured reference strings (SRS) that can be both universal (a single setup to support all circuits of some bounded size) and updatable (an open set of participants can contribute secret randomness to it indefinitely).
To improve performance, AuroraLight uses an algebraic trick introduced in Aurora IOP to create a prover polynomial with constant coefficient = 0 to circumvent using negative powers, in comparison to Sonic which uses Laurent polynomials and may deal with both both negative and positive powers.
That being said, AuroraLight reduces the prover polynomial degree to at most 2n, in comparison to that in Sonic which requires roughly a 7n size range from -4n to 3n, where n is the number of multiplication gates in a circuit.
AuroraLight also evades the need to handle holes as introduced in Sonic, where a hole is need to be put in the polynomial degree range to disallow the constant coefficient, which doubles the SRS size.
Overall, AuroraLight can achieve better prover run time and SRS size when compared to Sonic.
On the other hand, Sonic retains smaller proofs, less auxiliary data and extra verifier work in helper mode, and a fully succinct verifier mode.
In conclusion, the advantages of AuroraLight are more prominent in a setting that accepts parallel proof generation.
Authors: Ariel Gabizon*,
Affiliations: * Protocol Labs.
This Week in Security:
1. Paper Title: Hydras and IPFS: A Decentralised Playground for Malware.
Summary: This work investigates the use of the InterPlanetary File System (IPFS) for the coordination of a botnet, argues that the use of IPFS for the distribution of malicious content is relatively clear, and discusses other issues that emerge from this perspective.
Authors: Constantinos Patsakis* and Fran Casino*,
Affiliations: * University of Piraeus.
This Week in Privacy:
Summary: A fully-fledged RingCT scheme in the discrete logarithm setting that provides the highest concrete and asymptotic efficiency as of today.
This Week in Scalability:
Summary: The first protocol for atomic multi-channel updates and reduced collateral that is compatible with Bitcoin (and other cryptocurrencies with reduced scripting capabilities).
Summary: The first secure, privacy-preserving, interoperable, and fungibility-preserving PCH that builds on a novel cryptographic primitive that realizes a three-party protocol for conditional transactions, where the intermediary pays the receiver only if the latter solves a cryptographic challenge with the help of the sender.
Affiliations: * TU Wien.
Summary: A new linkable ring signature scheme that enables for the first time payment channels and off-chain multi-hop payments in the Monero cryptocurrency.
Summary: A method for greatly reducing the storage needed to run a fully validating node which uses a hash-based cryptographic accumulator and introduces a new type of node that stores only an accumulator representation of the state.
Authors: Thaddeus Dryja*,
Affiliations: * MIT Digital Currency Initiative.
This Week in Proofs:
Summary: A zero-knowledge proof system where if C is the size of the circuit being proved (i) the prover time is O(C) irrespective of the circuit type; (ii) the proof size and verification time are both O(d log C) for d-depth log-space uniform circuits. It requires a one-time trusted setup that depends only on the size of the input to the circuit and not on the circuit logic.
Summary: A QAP-based SE-SNARK with a single verifying equation in an asymmetric group (Type III pairing). Given three groups with a bilinear map e : G1 × G2 → GT , the proofs consists of only 3 group elements from the source groups: two from G1 and one from G2. This work also presents a SAP-based SE-SNARK with 2 elements for a proof and a single verifying equation, in a symmetric group (Type I pairing).
This Week in Consensus Protocols:
1. Paper Title: Polygraph: Accountable Byzantine Agreement.
Summary: A new Byzantine agreement algorithm among n nodes out of which t can be Byzantine with the following guarantees: (i) if t < n/3, then consensus is guaranteed, (ii) no matter the number of Byzantines nodes, if a disagreement occurs between two honest nodes, every honest node eventually produces an irrefutable proof as to the identity of some malicious users.
Authors: Pierre Civit*, Seth Gilbert†, and Vincent Gramoli*,
This Week in Tokenomics:
1. Paper Title: Token Economics Framework.
Summary: Relying on economic theory, this work explains the 3 fundamentals pillars of designing token ecosystems, to achieve sound economics with robust mechanisms, and to identify the variables that could affect the long-term sustainability of these ecosystems.
Authors: Lisa Tan*,
Affiliations: * Economics Design Limited.
“Significant advancements and innovations in the blockchain space are constantly being achieved by academic researchers. We are committed to helping share and spread this research. In our newsletter, we aim to provide a list of publications that will help guide the community with the latest research in the blockchain space.
Unfortunately, a lot of this research is overlooked due to the massive numbers of papers being generated and the way they are being promoted and published. To tackle this issue, we’ve put together a categorized list of academic papers that can guide our subscribers and keep them up to date.”
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