Re: ERS - using hash tree?

["Jesus Maria Mendez Perez" <jesusmmp@xxxxxxxxx>]

Hello Tobias, I´m Jesus.

I have some questions and I hope you can help me.

First, about what happen with the gap of time that pass while you send a data object and finally at the evening the ERS-system build
the hastree for all documents that were archived during that day?. For example, if you send a data object at 3:00 pm and the ERS-system build the hashtree at 8:00 pm... you have 5 hours during which that data object could lose its integrity. What can we do in this situation?
Could be the solution to timestamp every data object separately and inmediately after they are sent by the client and when the ERS-system have to build the hashtree, the hash-tree will built with all these data objects and its timestamps? 

And now about the ARCHIVE operation. In the LTAP Protocol draft is said LTAP Protocol is asynchronous by nature. And my question is about then second response (service response). Will a client receive the second response when the TAS hast just received the data object or when the archive operation has just finished (the hashtree has been built)?
If the ARCHIVE operation is asynchronous we really need another operation to permit a client to check if the full archive operation has finished...

Finally about the information called "Complementary data" in the article "Long-term trusted preservation service using service interaction protocol and evidence records", does it include only timestamping certificates?, or does it include timestamps' certificates
and user signer´s certificates?. Are they obtain by SCVP and save up as complementary data in the archive operation? 

Thanks and Happy Christmas