Run the demo
Sign in with your email to get a one-time code, create a wallet, and send a transfer. This runs on Solana devnet: balances are the network's, transfers are broadcast and confirmed there, and devnet funds have no value. Your address is used only to send you the code. A transfer over the limit is held for a while and you get an email with a link to cancel it. How it works is on the description page.
About the dark panel
The dark panel is the signing frame. It runs on its own origin, holds your share of the key, and this page cannot read it - it can only ask it to sign. Nothing you type here reaches the frame except that request. Why it is built this way is on the description page.