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https://aur.archlinux.org/packages/?O=0&SeB=nd&K=bitmessage&outdated=&SB=n&SO=a&PP=50&do_Search=Go
and an annotated PKGBUILD
show several pyBM PKGBUILD files, aside from the non-working one in pyBM itself:
https://github.com/Bitmessage/PyBitmessage/blob/v0.6/packages/unmaintained/archpackage/PKGBUILD
not for no reason is it placed below "unmaintained".