Where is the multisig and private key functionality? I don't see it anywhere in the app.
I'd like to see how the 2-of-3 multisig is stored.
You can check our website for technology details and send a transaction from your Mixin Safe to see the multisig in action.
https://blockstream.info/tx/038a366e35ce50a7315b42f9139f19f868f481212ba9fc814e08a09bdd39a57e?expandThe link above is a transaction sent from one Mixin Safe address, as you can see the witness script shows two signatures used to unlock a timelockec 2-of-3 multisig script.
I have seen this project in the service board running a review campaign. I have also seen that many people have applied to the review the project. But it appears that this project is not a familiar one, but it has a good security feature. I remember when I first set up a 2-2 multi sig wallet, it wasn't a straight forward thing but I achieved it.
I have interest in this project and I will like to use it. I don't know if someone like o_e_l_e_o has studied this project. He has a way of explaining difficult things in a simple manner. I will be glad if he can respond to this.
Meanwhile, Op you did well by offering a review campaign. That is the only way to make the community acquinted with the project.
Thank you. Mixin Safe is a new project started this year, when I asked about Bitcoin script questions
https://bitcointalk.org/index.php?topic=5441806.0However Mixin Messenger is a project with lots of users and has been running for 6 years.