What happens if we run out of zeroes?

Is that even possible? With hashrate, miners, and difficulty constantly going up...

"Number of zeros" in what? What the hell are you asking?

OK, so every 8 zeros represents 4294967296 (almost 4.3 billion) times faster bitcoin hash rate. So we got more than 5 more sets of 8 zeros, or 4.29 billion x 4.29 billion x 4.29 billion x 4.29 billion x 4.29 billion Which is an exponential increase, not a linear increase ... it wont happen. Edit: reminder that 2^256 is close to the number of atoms in the universe (only about 1000 times smaller)

Thanks that's all I wanted to know. I always thought it was linear.