I saw that Bitfinex announced that they have updated their own multi-signature wallet. Why do they need to do this, is this something that official wallet API doesn't support?
- multi-signature wallet
- crafting bundles with multiple recipients
This wallet is just a client to easily use existing features of the tangle:
- multi-signature is at the core of flash channels.
- transfers with multiple recipients was from the start in IOTA's bundle design