A testing bug of an unreleased order type on Kraken let traders buy and sell Bitcoin at lower and higher levels than the market price
Source: https://cointelegraph.com/news/bug-on-kraken-let-users-buy-bitcoin-2k-cheaper-and-sell-2k-higher
Bug on Kraken Let Users Buy Bitcoin $2K Cheaper and Sell $2K Higher
September 16, 2019
CoinTelegraph