It has been mentioned a couple times here and there that [Len Sassaman](http://en.wikipedia.org/wiki/Len_Sassaman) was memorialised somewhere in the Block Chain. I was able to find a dump of of the [tribute to him](http://pastebin.com/raw.php?i=BUB3dygQ), but I can't seem to find where in the Chain did this tribute come from.

What are the Blocks/Transactions that contain the tribute to Len Sassaman?