Bitcoin Wallets Under Siege From ‘Large Collider’ Attack, And My Thoughts About It.

To put this into perspective. Google owns one of the few quantum computers on the planet. A few months ago they used it and were able to cause a single collision in SHA-1 and we use SHA-256. These guys have never shown one piece of evidence that supports there claims. In fact a root access bug was found in there .exe the other day. The second anyone gets even close to SHA-128 we will hard fork to SHA-512, SHA-1028, and so on.

On 23 February 2017, Google announced the SHAttered attack, in which they generated two different PDF files with the same SHA-1 hash in roughly 263.1 SHA-1 evaluations. This attack is about 100,000 times faster than brute forcing a SHA-1 collision with a birthday attack, which is estimated to take 280 SHA-1 evaluations. The attack required "the equivalent processing power as 6,500 years of single-CPU computations and 110 years of single-GPU computations."

https://en.wikipedia.org/wiki/SHA-1#SHAttered_-_First_public_collision

http://fortune.com/2017/04/15/bitcoin-collider/