Bitcoin relies on a shared and distributed data store called a blockchain. Installing the Bitcoin Core sovereign app creates a copy of the Bitcoin blockchain on your Embassy which can be queried. This allows you to transact in Bitcoin with complete confidence that you have an accurate picture of the state of the blockchain -- that you have the Bitcoin you think you do as do those you are trading with.
You will need a Bitcoin wallet with Tor support for talking with your Bitcoin Core sovereign app. A Bitcoin wallet application is currently under development, but for the time being there are a few 3rd party options:
- Green Wallet (Android, IOs) https://blockstream.com/green/
- Electrum (Desktop) https://electrum.org/#home
To learn more about Bitcoin, consider the following resources: