Yea Nathan was totally right, the input to the write node was a "input" node. 
So i put a dummy CC node in there just to grab the hash. Now it works, KINDA. 
There is one more thing I am trying to figure out. Here is the code I put into 
a text node to compare input and output hash

[metadata nuke/node_hash]
[python {hex(nuke.toNode('precompWrite').input(0).opHashes()[0])}]

the metadata returns

e829kas94j908927

and the ophash returns 
0xe829kas94j908927L

Notice the ophash has a extra 0x in front and a L at the end. Any idea what 
this is? It seems to always be the same so I suppose I can just cut off the 
first two characters and the trailing characters. Seems like the wrong way to 
fix the problem though.



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