https://bitcointalk.org/index.php?topic=893271.0
One member of the Burst (a coin that works on HDD capacity rather than PoW or PoS) community asked me whether AT could be used to help anonymize transfers and at first I thought this was simply not possible as AT has no secrets.
I am glad I then thought about this again - and suddenly I realised that the "atomic cross-chain transfer" (http://ciyam.org/at/at_atomic.html) use case could be changed ever so slightly to do something I had not thought that AT could ever do (help provide anonymity).
Normally an ACCT (atomic cross-chain transfer) would involve putting the same "hash" into two ATs (each residing on a different blockchain) and then sending the secret to unlock both in order to make the transaction take place.
But there is no need for the secret to be "identical" - so here is an example:
one AT is created with the hash 2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b hard-coded in it - but the AT on the other blockchain doesn't have this but instead 04d3368f72736ed54c3cb63454eef23c2ecfb1deed27e2a4aa8e442e898fdbf5.
If we were to study both blockchains we can't see any immediate relationship between the two ATs that have been created to do the ACCT but an ACCT can occur nonetheless as those hashes are actually SHA256 hashes of "secret" and "terces" (this is of course a trivial example of how to do this - a more viable version would use something much more complicated than just reversing the secret).
Assuming we had numerous ATs operating across numerous blockchains all doing transfers at around the same time it is pretty clear that the "ultimate decentralised coin mixer" could be created.