The Arwen Trading Protocols (Full Version)

The Arwen Trading Protocols are layer-two blockchain protocols for traders to securely trade cryptocurrencies at a centralized exchange, without ceding custody of their coins to the exchange. Before trading begins, traders deposit their coins in an on-blockchain escrow where the agent of escrow is the blockchain itself. Each trade is backed by the coins locked in escrow. Each trade is fast, because it happens offblockchain, and secure, because atomic swaps prevent even a hacked exchange from taking custody of a trader’s coins. Arwen is designed to work even with the “lowest common denominator” of blockchains—namely Bitcoin-derived coins without SegWit support. As a result, Arwen supports essentially all “Bitcoin-derived” coins e.g., BTC, LTC, BCH, ZEC, as well as Ethereum. Our protocols support Limit and RFQ order types, we implemented our RFQ protocol and are available for use at

[1]  Ethan Heilman,et al.  TumbleBit: An Untrusted Bitcoin-Compatible Anonymous Payment Hub , 2017, NDSS.

[2]  Arthur Gervais,et al.  NOCUST - A Non-Custodial 2nd-Layer Financial Intermediary , 2018, IACR Cryptol. ePrint Arch..

[3]  Giulio Malavolta,et al.  Anonymous Multi-Hop Locks for Blockchain Scalability and Interoperability , 2019, NDSS.

[4]  Elaine Shi,et al.  Bitter to Better - How to Make Bitcoin a Better Currency , 2012, Financial Cryptography.

[5]  Ethan Heilman,et al.  Atomically Trading with Roger: Gambling on the Success of a Hardfork , 2017, DPM/CBT@ESORICS.

[6]  Hubert Ritzdorf,et al.  On the Security and Performance of Proof of Work Blockchains , 2016, IACR Cryptol. ePrint Arch..

[7]  Andrew Miller,et al.  Pisa: Arbitration Outsourcing for State Channels , 2019, IACR Cryptol. ePrint Arch..

[8]  Alexei Zamyatin,et al.  XCLAIM: Trustless, Interoperable, Cryptocurrency-Backed Assets , 2019, 2019 IEEE Symposium on Security and Privacy (SP).

[9]  Matthew Green,et al.  Bolt: Anonymous Payment Channels for Decentralized Currencies , 2017, CCS.

[10]  Jason Teutsch,et al.  A scalable verification solution for blockchains , 2019, ArXiv.

[11]  Christian Decker,et al.  A Fast and Scalable Payment Network with Bitcoin Duplex Micropayment Channels , 2015, SSS.

[12]  Joseph Poon Plasma : Scalable Autonomous Smart Contracts , 2017 .

[13]  Henning Pagnia,et al.  On the Impossibility of Fair Exchange without a Trusted Third Party , 1999 .

[14]  Jeremy Clark,et al.  SoK: Transparent Dishonesty: Front-Running Attacks on Blockchain , 2019, Financial Cryptography Workshops.

[15]  Emin Gün Sirer,et al.  Bitcoin Covenants , 2016, Financial Cryptography Workshops.