what exactly do you mean here with the "merkle tree approach"?
I think to prove reserves, you will have to one way or another reveal
the addresses of your cold storage (someone please correct me
if that is wrong)... and then sign a message as well proving you
control those addresses. You would then, basically show the amount you
have in storage is greater than the volume being traded.
Anyway thats my 2 cent stab at answering your question.
I mean to ask as a exchange we don't want to depend on third party like blockchain or Armory,We want use our own wallet.
Can you suggest me procedure how it will goes with the help of organogram or something. (I am not a technical guy,developers will to the rest of coding work and all)