versions

:var list microdescriptor_hashes: **\*** tuples of two values, the list of
  consensus methods for generating a set of digests and the 'algorithm =>
  digest' mappings

**\*** attribute is either required when we're parsed with validation or has
a default value, others are left as **None** if undefined

.. versionchanged:: 1.5.0
   Added the identifier and identifier_type attributes.

.. versionchanged:: 1.6.0
   Added the protocols attribute.
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