They're cracking a challenge with intentionally weak keys. They're not cracking addresses generated by normal wallets. For example, here's a challenge that ge

They're cracking a challenge with intentionally weak keys. They're not cracking addresses generated by normal wallets. For example, here's a challenge that gets increasingly hard that you can use to see how efficient crackers are: https://blockchain.info/tx/08389f34c98c606322740c0be6a7125d9860bb8d5cb182c02f98461e5fa6cd15 https://blockchain.info/tx/08389f34c98c606322740c0be6a7125d9...