We compile a comprehensive data set of initial coin offerings (ICOs) from 19 data sources including 11 ICO aggregators. We alleviate severe limitations of available ICO data by performing the first systematic analysis of ICO data quality. We use our data set to study determinants of ICO funding success as well as post-ICO operating performance and provide evidence on some novel determinants of initial and longer-term ICO success. Finally, we show that post-ICO operating performance is positively associated with contemporaneous
token returns and is generally negatively associated with token return volatility,
suggesting that post-ICO operating performance has financial ramifications.