I am the truest; name a rapper that I ain't influenced

from Nas – Ether Lyrics on Rap Genius

Meaning

This can reference many things (blatant or indirectly):

Basically saying that he’s the one that has proved himself to be worthy of his position of King of NY more than anyone (and certainly more than Jay-Z). Also by the truest he could mean he hasn’t lost his street roots and hasn’t crossed over to the mainstream to make more money. Like Jay Z did with for instance “Sunshine”.

http://www.youtube.com/watch?v=O4XBaPl9Tns

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