The ראשונים explain why is it that if you pull a cow in order to acquire it thirty days later it does not work but here giving money to be מקדש when you only want to it to take effect after thirty days it does work
The מאירי quotes an opinion that this is something which would work for all קניני קידושין based on that understanding it comes out that are sugya is making a distinction between קידושין and all other types of קנינים
It seems the conventional opinion in the ראשונים is that this sugya is only true by קנין כסף but by שטר if the נייר was not around at the time of the חלות it would not work.
Based on this our sugya is bringing out a חידוש about קנין כסף
It seems it can be understood in two ways
a) Even though there is no physical money left it is like there is something here now at the time of the חלות
עי׳ רשב״א
b) For קנין כסף you don't need anything to be around at the time of the חלות
עי׳ ר״ן here and in נדרים
Learn the ריטב״א on דף ו עמוד ב׳
learn the אבני מילואים
The מאירי quotes an opinion that this is something which would work for all קניני קידושין based on that understanding it comes out that are sugya is making a distinction between קידושין and all other types of קנינים
It seems the conventional opinion in the ראשונים is that this sugya is only true by קנין כסף but by שטר if the נייר was not around at the time of the חלות it would not work.
Based on this our sugya is bringing out a חידוש about קנין כסף
It seems it can be understood in two ways
a) Even though there is no physical money left it is like there is something here now at the time of the חלות
עי׳ רשב״א
b) For קנין כסף you don't need anything to be around at the time of the חלות
עי׳ ר״ן here and in נדרים
Learn the ריטב״א on דף ו עמוד ב׳
learn the אבני מילואים