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"Town Crier: An Authenticated Data Feed for Smart Contracts" - Prof. Ari Juels

Abstract: Most interesting smart contracts require real-world data. Today, though, a lack of trustworthy, flexible data feeds (a.k.a. oracles) is hobbling smart-contract ecosystems such as Ethereum.

In this talk, I’ll present Town Crier (TC), an authenticated data feed system built using Intel’s new SGX trusted hardware features. TC acts as a trustworthy proxy between existing (HTTPS-enabled) servers and smart contracts without any need for users to trust the system’s operators. Unlike basic oracles, TC also supports private queries, which offer the critical property of confidentiality for data requests, and custom queries, which make secure use of users’ credentials. Applications include insurance contracts that protect consumer privacy, systems to trade online resources such as games for cryptocurrency, and much more.

IC3 is planning to launch a basic version of TC as a free service in the coming months.

About the Speaker: Ari Juels is co-Director of IC3, and a professor at the Jacobs Technion-Cornell Institute at Cornell Tech in NYC. He was previously Chief Scientist of RSA, the Security Division of EMC.

Schedule: Doors open at 6:30pm EDT.  Enjoy networking with other smart contract enthusiasts from 6:30-7pm while pizza and bottled water is served. The talk will start at 7pm. We will clear the room by 8:30pm. All are welcome to gather for an informal after-party (cash bar) at a local establishment. 

Important info regarding access on Sept 29: You will need (1) to be preregistered with your first and last name on this Meetup site, and (2) to show photo ID in the ground floor lobby of 111 8th Avenue, to access the elevators to the 3rd floor. Doors open at 6:30pm. 


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  • Matt L.

    Presentation was done very well. It was informative on both a technical and non technical level, but it was brief enough to allow for questions and networking.

    1 · October 4

  • Russ

    Great event (I also liked the previous Hawk presentation). I am really learning a lot from these meetups, and love the focus on concrete solutions to some very tough and important problems.

    1 · September 30

    • Jim B.

      Thank you Michael! Well done!

      1 · September 30

  • Jim B.

    Thanks to all for coming out last night, and thanks to Prof. Juels for his excellent talk on Town Crier, plus an overview of the 5 Grand Challenges facing blockchains and the other IC3 projects addressing those - http://www.initc3.org/projects.html

    September 30

  • Juan B.

    Juan Batiz-Benet for late entry -- (I messaged Jim separately)

    September 29

  • Jonathan L.

    Jonathan Levin for the late entry

    September 29

  • Nick

    Will this be recorded?

    September 28

    • Michael A.

      I can bring an action cam. But someone with something more sophisticated would be better.

      1 · September 29

    • Jim B.

      Please bring your action cam Michael. Thanks!

      1 · September 29

  • Jim B.

    Note: Registration will close at 3PM EDT today. We will need your first and last names by then to be on the access list (Photo ID is required at the lobby reception desk for access). You can message your first and last to me before 3PM EDT.

    September 29

  • Rick D.

    Is the timezone correct? It says PDT.

    1 · September 28

    • Jim B.

      Hi Rick: We tried to change the time zone to EDT from PDT, but Meetup doesn't allow so. You can trust the info above. Schedule: Doors open at 6:30pm EDT. Enjoy networking with other smart contract enthusiasts from 6:30-7pm while food and bottled water is served. The talk will start at 7pm. We will clear the room by 8:30pm. All are welcome to gather for an informal after-party (cash bar) at a local establishment.

      September 28

  • Jim B.

    Sorry, no pizza at the Meetup....better! We’re catering a light meal from Ta’im, an Israeli restaurant. Come at 6:30pm EDT to partake and network with colleagues.

    September 28

  • Thomas H.

    how do we give you our name if we already RSVPed?

    September 28

    • Jim B.

      Aren't you the real Thomas Halikias? If so, you're all set. If someone registered with initials or a pseudonym, they can message me their first and last names.

      1 · September 28

  • Jim B.

    For building access, our building landlord requires your first and last name on the IC3 NYC Meetup site (photo ID is required at the lobby reception desk for access). I am told there are no exceptions.

    Doors will open at 6:30PM EDT. Pizza will be served from 6:30PM-7PM

    Looking fwd to seeing you there!

    1 · September 28

  • Yorke R.

    Looking forward to the discussion. This is an area of focus in our Bletchley Cryptlets work.

    1 · September 28

  • Chintan

    Hello, Please post a webex/goto meeting link if this meeting can be attended remotely.

    September 16

    • Jim B.

      no remote access, sorry.

      September 28

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