I have timestamped the document, but Acrobat doesn't show it. Why?
Acrobat is very sensitive to the TSP reply, given by the TSP server. For example, the certificate chain must be completely validated by Acrobat in order for the timestamp to be detected. Also, the certificate should contain specially set key usage field. There can be other problems with TSP replies, such as slightly different DER encoding in TSP reply, that might prevent Acrobat from handling the timestamp properly.