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Bitcoin flash crash on May 19, 2021: What did really happen on Binance?

Author

Listed:
  • Baumgartner, Tim
  • Güttler, André

Abstract

Bitcoin plunged by 30% on May 19, 2021. We examine the outage the largest crypto exchange Binance experienced during the crash, when it halted trading for retail clients and stopped providing transaction data. We find evidence that Binance back-filled these missing transactions with data that does not conform to Benford's Law. The Bitcoin futures price difference between Binance and other exchanges was seven times larger during the crash period compared to a prior reference period. Data manipulation is a plausible explanation for our findings. These actions are in line with Binance aiming to limit losses for its futures-related insurance fund.

Suggested Citation

  • Baumgartner, Tim & Güttler, André, 2022. "Bitcoin flash crash on May 19, 2021: What did really happen on Binance?," IWH Discussion Papers 25/2022, Halle Institute for Economic Research (IWH).
    • Handle: RePEc:zbw:iwhdps:252022
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    References listed on IDEAS

    as
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    More about this item

    Keywords

    Benford's law; Binance; Bitcoin; cryptocurrency; crypto exchange; derivatives; extreme volatility; fraud; market crash; trading outage;
    All these keywords.

    JEL classification:

    • G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • K22 - Law and Economics - - Regulation and Business Law - - - Business and Securities Law

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