[ot][spam][crazy] uploading stuff to blockchains

[Undiscussed Horrific Abuse, One Victim of Many]

the error output is confusing and too verbose
i haven't finished parsing it

but it looks like it gives sufficient information to exactly reproduce
the post request using curl, for debugging or reporting to a sysadmin

if the tmpfile it's reading from has been destroyed, i'd have to
access it based on the open process's handle or something