@staticmethod<EOL><INDENT>def dir(base_dir: str, rr_id: str) -> str:<DEDENT>
return join(base_dir, rev_reg_id2cred_def_id(rr_id))<EOL>
Return correct subdirectory of input base dir for artifacts corresponding to input rev reg id.

:param base_dir: base directory for tails files, thereafter split by cred def id
:param rr_id: rev reg id