Hey Matias,

We are working on bitcore-wallet-server (BWS), a HD multisig wallet
> 'facilitator'.
> Currently the BWS instances hold the set of extended public keys of the
> wallet's peers to be able to derive  addresses.
>

Could you describe what exactly BWS does? It sounds like the server doesn't
have to actually derive the keys itself for any particular purpose beyond
knowing the addresses are a part of the wallet. Could the server work if it
didn't even know that, and was just a bucket of arbitrary addresses with
the clients themselves deriving the addresses?