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    TumbleBit: an untrusted Bitcoin-compatible anonymous payment hub

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    Date Issued
    2017
    Publisher Version
    10.14722/NDSS.2017.23086
    Author(s)
    Heilman, Ethan
    AlShenibr, Leen
    Baldimtsi, Foteini
    Scafuro, Alessandra
    Goldberg, Sharon
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    Permanent Link
    https://hdl.handle.net/2144/29224
    Version
    Published version
    Citation (published version)
    Ethan Heilman, Leen AlShenibr, Foteini Baldimtsi, Alessandra Scafuro, Sharon Goldberg. 2017. "TumbleBit: An Untrusted Bitcoin-Compatible Anonymous Payment Hub." Network and Distributed System Security Symposium.
    Abstract
    This paper presents TumbleBit, a new unidirectional unlinkable payment hub that is fully compatible with today s Bitcoin protocol. TumbleBit allows parties to make fast, anonymous, off-blockchain payments through an untrusted intermediary called the Tumbler. TumbleBits anonymity properties are similar to classic Chaumian eCash: no one, not even the Tumbler, can link a payment from its payer to its payee. Every payment made via TumbleBit is backed by bitcoins, and comes with a guarantee that Tumbler can neither violate anonymity, nor steal bitcoins, nor print money by issuing payments to itself. We prove the security of TumbleBit using the real/ideal world paradigm and the random oracle model. Security follows from the standard RSA assumption and ECDSA unforgeability. We implement TumbleBit, mix payments from 800 users and show that TumbleBits offblockchain payments can complete in seconds.
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    • BU Open Access Articles [3730]
    • CAS: Computer Science: Scholarly Papers [187]


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