according to different observation i think few ways are available for abusing bitcoins transections such as Technical weakness , Greedy peoples ro dishonest people , proper management. i would like to describe above mentioned quotatin in briefly
1. technical weakness: we know its a peer to peer transection system throgh confirmed way. within a few second a dishonest person can get more money by fast clicking when submit second payment of different recipient.
2. proper management: there is so many lack of proper management of human or account holders. so many hackers want to hack system for getting money because bitcoins holder don't have any insurance like bank account holders. even government don't follow rules and regulation for virtual currency holders.
So what you think about it ?
Blockchain technology is designed to prohibit hacks and multiple transactions taking place at the same time. Every transaction happens on its own blocks, then how will there be any issues by fraudulent attacks? Just go through how blockchain system works then probably you will certainly have more confident on crypto transactions. The main think is you need to keep your wallets / accounts safer with secured options provided by the concern providers. Another thing is any mode of currency either crypto or fiats, can be used for legal and illegal purposes. It depends on the individuals not with what currency we do use.