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After having installed the requirements and built speculos:
The docker image can also be used directly, as detailed in the specific docker documentation page.
The Nano S is the default model; the Nano X and Blue can be specified on the
./speculos.py --model nanox apps/nanox#btc#1.2#57272a0f.elf
./speculos.py --model blue --sdk 1.5 apps/blue#btc#1.5#00000000.elf
The last SDK version is automatically selected. However, a specific version
be specified if the target app is not build against the last version of the SDK,
thanks to the
--sdk argument. For instance, to launch an app built
against the SDK
1.5 on the Nano S:
./speculos.py --sdk 1.5 --model nanos apps/btc.elf
Supported SDK values for the
--sdk argument are:
||1.5, 1.6, 2.0
For more options, pass the
- The keyboard left and right arrow keys are used instead of the Nano buttons.
The down arrow can also be used as a more convenient shortcut.
Q key exits the application.
Several display options are available through the
qt: default, requires a X server
headless: nothing is displayed
text: the UI is displayed in the console (handy on Windows)
These options can be used along
--vnc-port which spawns a VNC server on the
specified port. macOS users should also add
--vnc-password <password> if using
the built-in VNC client because unauthenticated sessions doesn’t seem to be
supported (issue #34).
A recording of the screen can be saved as a GIF file thanks to the
App name and version
On a real device, some parameters specific to the app to be installed (name and
version, icon, allowed derivation paths, etc.) are given during the
installation. This information isn’t embedded in the .elf file itself and thus
cannot be retrieved by speculos.
The default app name and version are respectively
1.33.7, but these
values can be set through the
SPECULOS_APPNAME environment variable. For
$ SPECULOS_APPNAME=blah:22.214.171.124 ./speculos.py ./apps/btc.elf &
$ echo 'b0 01 00 00 00' \
| LEDGER_PROXY_ADDRESS=127.0.0.1 LEDGER_PROXY_PORT=9999 ledgerctl send - \
| xxd -r -ps \
00000000 01 04 62 6c 61 68 07 31 2e 32 2e 33 2e 34 01 00 |..blah.126.96.36.199..|
00000010 90 00 |..|
Bitcoin Testnet app
Launch the Bitcoin Testnet app, which requires the Bitcoin app:
./speculos.py ./apps/btc-test.elf -l Bitcoin:./apps/btc.elf