Hi,
I'm trying to figure out a way to be more secure, but i'm unsure if this plan is working, I need more technical advice.
What i've done: I've set up a 2-3 multisig wallet using Electrum on my computer and sent some satoshi to it. I've sent some satoshi from that multisig wallet by creating a signed transaction with wallet 1, and signed that transaction with wallet 2 and the transaction was approved, all satoshi's moved to a different wallet successfully.
I'm thinking about the following plan:
The idea: In case one site burns down, I always have the information of all three keys spread over two sites and I will always be able to access my BTC.
Here's what confuses me and why I need technical help
1) When looking at the picture above, you see every site contains the seed and xpub of 2 wallets. Imagine burglary at site 1 and the thief steals the information (seed + xpub) of key's 1 and 3. Will he be able to access/send tx with that information?
Reason I'm asking: Electrum asks me to provide the information of all 3 wallets.
2) I could successfully send tx using 3 Electrum Windows clients. I wasn't able to spend satoshi's using 1 wallet, HOWEVER: when I moved one of the seeds to the Android Electrum wallet, I was able to spend everything without any other signature at all! TX already got confirmed 8 times! How is this possible?