The Foo app

This repository implements a protocol for clear signing transactions of a specific format that the bitcoin app does not support.

The Foo protocol expect transactions that are just like nmormal transactions (inputs and change outputs from a standard account compliant to BIP-44, BIP-49, BIP-84 or BIP-86), plus in additionn:

• a special 'magic input' that is a P2TR UTXO with taproot public key at a the fixed derivation path m/86'/1'/99'.
• an OP_RETURN output with the message FOO.

The app's UX validates that the transaction satisfies this protocol, and shows all the transaction details in the UX.

Compiling the app

Initialize the submodule with

$ git submodule update --init --recursive

Compile the app as usual. You should be able to launch it using speculos.

Running the tests

Create a Python virtual environment and install the requirements:

$ python -m venv venv
$ source venv/bin/activate
$ pip install -r tests/requirements.txt

Launch the test suite; for example, if you compiled the app for Ledger Flex:

$ pytest --device=flex