@staticmethod<EOL><INDENT>def associate(base_dir: str, rr_id: str, tails_hash: str) -> None:<DEDENT>
cd_id = rev_reg_id2cred_def_id(rr_id)<EOL>directory = join(base_dir, cd_id)<EOL>cwd = getcwd()<EOL>makedirs(directory, exist_ok=True)<EOL>chdir(directory)<EOL>symlink(tails_hash, rr_id)<EOL>chdir(cwd)<EOL>
Create symbolic link to tails file named tails_hash for rev reg id rr_id.

:param rr_id: rev reg id
:param tails_hash: hash of tails file, serving as file name