Quote from: jeanluca on November 10, 2024, 10:53:12 AM

Suppose I want to setup a wallet with 1 seed with Sparrow wallet. Now all can just work find. But what has happens now behind the scene in my hacked Sparrow wallet, is that it created a multi sig wallet, a 1-out-of-2 wallet.

To be honest, I didn't understand what exactly you are asking. So, let me try to cover some general points. You are not creating the wallet in Sparrow. Jade is creating it and generating your seed in an airgapped environment. Sparrow wallet (the hot wallet) doesn't know your seed, so you can't lose your bitcoin even if your Sparrow wallet got hacked.

Quote from: jeanluca on November 10, 2024, 10:53:12 AM

Again, I can check receiving addresses using another software wallet. But is there a way to detect something is wrong without the extra software wallet?

Something would be wrong if the address that Sparrow wallet displays in the interface can't be verified on your Jade with the correct seed phrase loaded in it. If Jade can't verify your address, then Sparrow isn't showing you an address which is part of your wallet or you have imported the wrong seed in Jade.

You need Sparrow or a different hot wallet if you are going to work with your Jade in airgapped mode. The hot wallet creates your transaction and broadcasts it to the network. The Jade (cold wallet) signs the transaction with its private key(s). Both are essential to the process.