BIP 0039 and Watch-Only Functionality

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BiP 0039 is fast becoming the standard for mnemonic code creation as a seed for generating deterministic keys.

This is important because most hardware wallets are supporting it (e.g. Trezor, Ledger, etc.) as their primary means of generating keys.

At login, a user could select "Watch-Only" and Counterwallet could use the Master Public Key to load addresses and balances and a hardware wallet would store all of the corresponding private keys. All signing of transactions could then be passed from Counterwallet to the hardware device.

_Or you could just login with the Master Public Key anyway. Could this be done now? Regardless of BIP 0039 support or not._

EDIT: Currently Counterwallet uses Electrum-compatible seeds, not BIP 0039 seeds. The option to chose either at login would be great.

As a consequence of BIP 0039 support, BIP 0044 could be implemented. This could lend itself to a very interesting use case by registering XCP as a new "Coin Type". This would allow for the natural separation of BTC and XCP (and Counterparty Assets) within the same wallet.

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