code: function readSharedAddressCosigners(shared_address, handleCosigners){
  	db.query(
  		"SELECT DISTINCT shared_address_signing_paths.device_address, name, "+db.getUnixTimestamp("shared_addresses.creation_date")+" AS creation_ts \n\
  		FROM shared_address_signing_paths \n\
  		JOIN shared_addresses USING(shared_address) \n\
  		LEFT JOIN correspondent_devices USING(device_address) \n\
  		WHERE shared_address=? AND device_address!=?",
  		[shared_address, device.getMyDeviceAddress()],
  		function(rows){
  			if (rows.length === 0)
  				throw Error("no cosigners found for shared address "+shared_address);
  			handleCosigners(rows);
  		}
  	);
  }
docs: returns information about cosigner devices