https://doomwiki.org/wiki/DOOM64.WAD

DOOM64.WAD is the IWAD used by the 2020 ports of Doom 64. 

v1.0:
crc32: cb10a53d
MD5 : e16e17f59afe7b3297f53ebe7e9de815
sha1: ae363db8cd5645e1753d9bacc82cc0724e8e7f21

v1.1:
crc32: 65816192
MD5 : 0aaba212339c72250f8a53a0a2b6189e 
sha1: d041456bea851c173f65ac6ab3f2ee61bb0b8b53 


Doom64 EX's built-in wadgen utility produces an alternative IWAD for Doom 64. 
It is neither compatible with the official ports, nor has a stable output depending on version and input N64 ROMs. 



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https://github.com/Doom-Utils/iwad-patches/tree/master/doom64.wad

Doom 64 has had a stadalone release on PC and consoles since 2020,
from which time the game actually has a distinct IWAD able to be set
apart from the engine, acting more like other Doom games on PC.

On the Nintendo 64, there still was somewhat of a distinction between
the engine and IWAD, but it becomes a technical detail when the only
useful unit for that console is the complete ROM image.

If unsure of which version you have, refer to these sha1 hashes:
ae363db8cd5645e1753d9bacc82cc0724e8e7f21  doom64_1.0.wad
d041456bea851c173f65ac6ab3f2ee61bb0b8b53  doom64_1.1.wad