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SUMMARY:XOX Fabric: A hybrid approach to blockchain transaction execution 
 - Christian Gorenflo (University of Waterloo)
DTSTART:20200116T150000Z
DTEND:20200116T160000Z
UID:TALK137209@talks.cam.ac.uk
CONTACT:Marco Caballero
DESCRIPTION:Abstract:\n \nPerformance and scalability are major concerns f
 or blockchains: permissionless systems are typically limited by slow proof
  of X consensus algorithms and sequential post-order transaction execution
  on every node of the network. By introducing a small amount of trust in t
 heir participants\, permissioned blockchain systems such as Hyperledger Fa
 bric can benefit from more efficient consensus algorithms and make use of 
 parallel pre-order execution on a subset of network nodes. However\, this 
 higher performance is only achievable for contention-free transaction work
 loads. If many transactions compete for a small set of hot keys in the wor
 ld state\, the effective throughput drops drastically. We therefore propos
 e XOX: a novel two-pronged transaction execution approach that both minimi
 zes invalid transactions in the Fabric blockchain and maximizes concurrent
  execution. Our approach additionally prevents unintentional denial of ser
 vice attacks by clients re-submitting conflicting  transactions. Even unde
 r fully contentious workloads\, XOX can handle more than 3000 transactions
  per second\, all of which would be discarded by regular Fabric.\n\nBio:\n
 \nChristian Gorenflo is a fifth year PhD student at the university of Wate
 rloo\, co-supervised by Prof. Lukasz Golab and Prof. Srinivasan Keshav. He
  received his Diplom (Physics) degree at the Karlsruhe Institute of Techno
 logy in 2012. Afterwards he worked as a consultant at Objektkultur Softwar
 e GmbH before starting a PhD program (Computer Science) at the University 
 of Waterloo in the Information Systems and Science for Energy (ISS4E) rese
 arch group in 2015. Since 2017 he is part of the Sirius blockchain researc
 h group and his research interests focus on performance optimizations for 
 distributed ledger systems. He currently holds the David R. Cheriton Gradu
 ate Scholarship.
LOCATION:FW26\, Computer Laboratory\, William Gates Building
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