1. Excessive Spoofing: Look out for a large number of buy/sell orders on the book that are quickly canceled or visible for a very short period of time. This type of trading pattern suggests that someone is attempting to move the market in a specific direction and is using large amounts of capital to do it.
2. Wash trades: When a trader purchases and sells a security in order to create an artificial sense of market activity. This is done to manipulate the price of a security and is illegal in many markets.
3. Pump and dump schemes: This is when a group of traders agree to purchase a certain cryptocurrency at the same time in order to artificially inflate its price. They then quickly sell it, causing the price to drop sharply.
4. Insider trading: When a trader has access to non-public information about a cryptocurrency and acts on that information to make a profit. This type of trading is illegal in many jurisdictions and can result in severe penalties if caught.
5. Front-running: This is when a trader takes advantage of knowledge of upcoming trades to purchase an asset before the trade is executed, in order to take advantage of the expected price movement. This is also illegal in many markets.