FPPW: A Fair and Privacy Preserving Watchtower For Bitcoin
FPPW: A Fair and Privacy Preserving Watchtower For Bitcoin
Most payment channels work based on this idea that once a dishonest channel party records an old state on-chain, its counter-party is supposed to provide evidence of invalidity of the published state within a time interval. Otherwise, the channel gets finalized with the recorded old state. Since duration of this time interval is limited, such payment channels rely on the assumption that channel parties check the blockchain frequently. However, since it is possible that channel parties crash or go offline for a long time, they might delegate the monitoring task to a third-party, called the watchtower. Existing watchtower schemes for Bitcoin fail to achieve both balance privacy against the watchtower and fairness towards all the channel participants. FPPW, which is introduced in this seminar, is the first watchtower scheme for Bitcoin that achieves these goals.
About the speaker
PhD Student, Monash University
Arash received his bachelor of science and master of science degrees in 2007 and 2009, respectively. He then worked in cyber security field for about ten years mostly working on analysis of symmetric key algorithms, design of different types of cryptographic protocols and design and evaluation of security architecture for different kinds of IT products and information systems. He then started his PhD at Monash university studying on layer-2 solutions to the scalability issues of blockchains.
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