cara decompilei o apk, e vi que eles usam a API da Boltz pra fazer a conversão, e não sei pq eles tem bibliotecas do Facebook no app...
It’s built with React Native (an open source project developed by facebook) and Breez Liquid SDK (which uses Boltz submarine swaps). You can read more about it here: https://blog.onionmill.com/p/introducing-stashpay-a-bitcoin-wallet
I want to see the source code
why not build the app with Android Java/Kotlin for Android and Objective C for iOS? No reason for a app like that to be over 170mb if all you doing is using Boltz api for swap.