The comma can be moved in any direction
It's not just moving the comma, it's reducing the target.
from
1185429467683753
to
785429467683753
Can you do the same with the public key?
yes.
Even if you can, it doesn't give you the range of the private key.
If you perfect your division technique
and you manage to reduce enough, you could for example.
1185429467683753
If you manage to reduce to
1439467683753
1185429467683753-1439467683753
1183990000000000
obtaining the first 3 digits of your goal..Discarding the 3 digits that follow, which would be the error range.
Basically this technique is based on reducing pubs without losing the last digits of the pk so that when you subtract you identify the first digits.
Then, once you have the first digits, you have the basis to continue.