[SethTro]

Took less than a minute to find a seven digit example in python

The SHA-256 of this sentence begins with 0, three, 9, four, 8, four, and 1 amazing!

The SHA256 for this sentence begins with 0, 4, five, 5, eight, 6, and 7 amazing!

Suffix extensions (hence the "amazing!") are several times faster to try than throwing away the entire sha256 state for each attempt.

[SethTro]

I ran the python version for over an hour and found this eight digit example

The SHA256 of this sentence begins with 0, zero, 0, seven, five, 9, nine, and 5 wow!