TumbleBit: An Untrusted Bitcoin-Compatible Anonymous Payment Hub




Ethan Heilman, Leen Alshenibr, Foteini Baldimtsi, Alessandra Scafuro, Sharon Goldberg
Boston University


Description:
TumbleBit is a new anonymous payments protocol that is fully compatible with today’s Bitcoin protocol. TumbleBit allows parties to make payments through an untrusted Tumbler. No-one, not even the Tumbler, can tell which payer paid which payee during a TumbleBit epoch. TumbleBit consists of two interleaved fair-exchange protocols that prevent theft of bitcoins by cheating users or a malicious Tumbler. TumbleBit combines fast cryptographic computations (performed off the blockchain) with standard bitcoin scripting functionalities (on the blockchain) that realize smart contracts. TumbleBit was used to mix 800 input addresses to 800 output addresses on Bitcoin's blockchain.

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