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Specter-DIY (MemoryCard)

The Specter-DIY applet (SpecterDIY.cap) is a small secure-element store that holds a single BIP-39 mnemonic and protects it with a card PIN. SeedSigner can save a seed to it, load it back, change its PIN, and wipe it.

See also: Bundled JavaCard Applets.

Requirements and setup

  • The Specter-DIY applet flashed to a JavaCard (SpecterDIY.cap).

  • Smartcard support enabled (default) and Specter-DIY support enabled in Settings → Advanced. Specter-DIY support is disabled by default.

  • The specter_card Python module. If it is not installed globally, point SeedSigner at a checkout:

    export SEEDSIGNER_SPECTER_CARD_PY_PATH=/path/to/specter-javacard/py
# or: export SEEDSIGNER_SPECTER_JAVACARD_PATH=...

The Specter-DIY menu

Tools → Smartcard Tools → Specter-DIY Functions

Specter-DIY menu

Menu item What it does
Change Card PIN Set or change the card's numeric PIN
Load Mnemonic Read the stored mnemonic into SeedSigner
Save Mnemonic Write the selected seed to the card
Wipe Seed Erase the mnemonic from the card

Saving a mnemonic

  1. Load the seed in SeedSigner.
  2. Specter-DIY Functions → Save Mnemonic.
  3. If the card has no PIN yet, SeedSigner offers to set one.
  4. If the card already holds data, confirm the overwrite.

Only BIP-39 seeds can be stored (XPRV / Electrum / SLIP-39 seeds are rejected). The mnemonic is stored as an encrypted blob.

Loading a mnemonic

Specter-DIY Functions → Load Mnemonic. Enter the card PIN if required; SeedSigner reads the mnemonic and loads it as a seed, then shows its fingerprint.

You can also reach the loader directly from Seeds → Load a seed → From Specter-DIY (when Specter-DIY support is enabled).

Changing the PIN

Change Card PIN handles all states:

  • If the card reports its PIN is disabled / not set, you are prompted to set one.
  • If a PIN is set, enter the old PIN and then the new one.
  • If the PIN is bricked (all attempts used), the only recovery is to reinstall the Specter-DIY applet — there is no factory reset.

Wiping the seed

Wipe Seed erases the stored mnemonic after a confirmation. It is not recoverable unless you have another backup.

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