Whenever you amend a commit, the commit time stamp changes; that ought to be enough, so that the nonce is not required. However, I think it has only second prec

Whenever you amend a commit, the commit time stamp changes; that ought to be enough, so that the nonce is not required. However, I think it has only second precision, so if you stick to honest wall time, it means 100 attempts require 100 seconds.