Bitcoin Forum

Has anyone done this yet?

Why follow them? What do you want to investigate?

What would be the benefit of doing this?

maybe something hack is ready  ;D

This is the only thing I can recall, I think Andreas did a security evaluation of Coinbase and verified their cold store/s.

http://antonopoulos.com/2014/02/25/coinbase-review/

No clue about circle

Without them publishing their cold storage addresses this would really not be possible (although I believe that one of the very "high up" mods has conducted audits on many of the exchanges, coinbase included - I believe that circle is too new). Publishing cold storage addresses would also potentially break anonymity for their customers so they would likely not want to do this.

I would say that coinbase is generally trustworthy to hold medium amounts of bitcoin for at least medium amounts of time as they have received VC and the VC firms likely have conducted some level of due dilligance on them

People seem to track anything and everything around here, top addresses, Silbert's Trust, lost coins, so I just wondered if anyone had done the same for these services. Even if you knew how many coins they had it wouldn't tell you about large internal transfers but large deposits or outflows might give some clue to whether other institutions are buying.

To the point about breaking customer anonymity, maybe they should implement strong mixing services if they are looking to provide privacy as a feature.