This Xaman (xumm.app) xApp allows users to configure a second Tangem card as a "backup card (account)" using on (XRP) ledger RegularKey features.
This xApp is being actively developed by XRPL Labs. This project is coded in Vue.
This project relies on https://github.com/XRPL-Labs/xapp-proxy-for-xumm-api, if you want to run this source locally you will need to run an instance of the xApp proxy locally as well.
npm install
npm run serve
npm run build