I recently discovered split address on
www.bitaddress.org, but I am not sure what this actually should be.
Basically you have one public adress and can choose how much "shares" (I assume those are priv keys, they look like it) are generated and how much of those are required to send from the address.
BUT, the public address is f.e.
14DMsSty9S6M51Bxh3X2ZiFhRvdfNhXAjV, why is that? I thought multisig adressess always start with a
3? Is the 3 at the beginning only optional?
As the name suggests, split wallet splits the private key into different shares. It is an older version of multi-sig. You can share the different parts with different people and later based on the minimum share threshold needed to combine, different shares can be combined to get the whole private key. Yeah it does not start with 3, but still valid. I would not recommend using bitaddress. Instead of using split wallet, just generate a multi-sig address.