With leadership ballot papers due to be sent out in the next few days before voting, which closes on 21 September, both Corbyn and Smith have been busy touring the country and announcing policy initiatives.
The additional day would allow either new passwords to be emailed, or for paper ballots to be sent out and returned.
Another bit of Swiss pragmatism: Proxeus' system enables even blockchain refuseniks to participate because it still allows for paper documents to be sent.
Ballot papers are due to be sent out on 14 August.
The grade at this point was provisional because the papers were due to be sent to the external examiner to be evaluated.
The backing of Labour's most experienced leader in opposition could prove significant as those eligible to vote in the election begin to return their ballot papers, which began to be sent out last week.
Ballot papers currently have to be sent out and returned by post.
The issues paper is expected to be sent out within the next few weeks and will feed into what will eventually be a green paper on the new bill, due to be published at the end of this year.
Next Saturday, children can also make paper butterflies with messages to be sent to children in Mexico, where monarch butterflies migrate.
