When you have to pay a check from another bank to your bank, banks will usually keep that amount for a few days, because they do not believe that these funds are actually available. Similarly, international money transfers can take a relatively long time. However with Bitcoin trading, generally faster.Once Bitcoins have been sent, they will go away. Someone who has sent Bitcoins can not attempt to retrieve them without the consent of the recipient. This makes it difficult for the types of fraud that we commonly see with credit cards, in which people make purchases and then contact credit card companies to make a chargeback, effectively preventing them. block the transaction.