Aggregate_alias contains the implementation needed for the wallet to have the correspondence between aliases and keys. It has three sub-module Public_key Public_key_hash Secret_key. The reason of a sub-module inside a sub-module is not confuse them with the alias module for the standard signature (i.e. Public_key, Public_key_hash, and Secret_key).

On possible refactor would be to move the alias definition in Aggregate_signature (resp. Signature).

See Client_aliases for more information about Aliases.