Does counterwallet.co has ways to access the private keys?

[CryptoPanda]

Ok, they generate the password in the browser. But what about the private keys?
Do they have access to them? And do we have ways to gain control if they go down?

[rme]

It seems that is working like blockchain.info (it can't access your private keys), I have not fully tested but it seems that.

Also they show you your private keys (in the address section) so I bet you can only access the private keys.

BUT, someday if the website code changes and captures your wallet passphrase they could get access to your keys.

TL;DR No, but.

[moni3z]

You can run counterpartyd yourself
http://counterpartyd-build.readthedocs.org/en/latest/

Their online wallet (counterwallet) should offer browser extensions for the client side operations, Cryptocat does this for good reason http://www.forbes.com/sites/jonmatonis/2012/07/30/cryptocat-increases-security-in-move-away-from-javascript-encryption/