Under the Model Regulations 2017, all persons entitled to vote who are present must sign an attendance list. A proxy signs on behalf of the owner they represent. The list is decisive for the quorum (article 50.3).
Also record the number of votes per owner on the attendance list. That way you can see at once whether, for example, two-thirds attendance for a heavier decision has been reached, and you can check voting results.
The KVK also needs the attendance list: when registering a (new) board, you include a copy of the attendance list of the meeting in which the board was appointed, signed by the owners present. So keep the list together with the minutes.
See also: Quorum, Minutes (notulen), Proxy (volmacht), KVK registration of the VvE
Read more: Quorum and majorities in a VvE
Legal basis: Modelreglement 2017, art. 50.3