How to implement secure timestamp

Question

after search google about the example code for java.security.timestamp,almost found nothing.
therefore i attempt to code myself bases on java document.since i still new in java,hence require your help from time to time.
there have 2 part on timestamp implementation,that is
1)+creating a signed timestamp from trusted timestamp server or TSA.+
According to veriSign website https://knowledge.verisign.com/support/ssl-certificates-support/index?page=content&id=AR185,
https://timestamp.geotrust.com/tsa would provide TSA service
2)+verify the timestamp+
the concept on implementation secure timestamp quite similar during sign digital signature on document.
creating a signed timestamp from trusted timestamp server or TSA
during creating a signed timestamp,document sender require provide thumbprint extract from certificate of document sender to TSA.
on the TSA,it would add up timestamp + thumbprint ,then hashing/signing by using private key of TSA.then TSA would return the hash value and timestamp
verify the timestamp
document receiver would receive sender's thumbprint ,timestamp and the hash value,receiver would send the thumbprint +timestamp to TSA to hash it again.TSA would return the hash value.
then receiver compare pair of hash result ,if both are same,then timestamp has been verify.
i tougth require following class and method to do above task
*java.security.Timestamp
-getSignerCertPath()
-getTimestamp()
*java.security.cert.CertPath
-getEncoded()
-equals()
*java.security.cert.TrustAnchor
=TrustAnchor(X509Certificate trustedCert, byte[] nameConstraints)
*java.security.cert.X509Certificate
....and what else?
Sincerely

Answer 1

how about
+javax.net.ssl.X509TrustManager ?Nothing to do with it.
i thought i should use [Package org.bouncycastle.asn1.tsp |http://www.cs.berkeley.edu/~jonah/javadoc/org/bouncycastle/asn1/tsp/package-summary.html] since it is implements base on rfc3161.
Now that sounds right.