BAL — Bitcoin After Life (Electrum plugin)

Free and decentralized Bitcoin inheritance support for the Electrum wallet. Build time-locked "will" transactions that transfer your funds to your heirs if you stop refreshing them (dead-man's switch), optionally relayed by will-executor servers.

This repository contains a behavior-preserving refactor of the original plugin. The logic was kept byte-identical wherever possible; only the file layout was reorganized to cleanly separate business logic from the PyQt GUI.

Repository layout

bal/                     the installable Electrum plugin package
├── manifest.json        plugin metadata (Electrum reads this)
├── qt.py                Qt entry-point shim (re-exports Plugin)
├── core/                GUI-free logic (importable without Qt)
│   ├── util.py
│   ├── plugin_base.py
│   ├── heirs.py
│   ├── will.py
│   └── willexecutors.py
├── gui/qt/              PyQt6 presentation layer
│   ├── theme.py         status → color mapping
│   ├── common.py        shared imports / helpers
│   ├── widgets.py       leaf widgets
│   ├── calendar.py      calendar widget
│   ├── dialogs.py       dialog windows
│   ├── lists.py         tree/list views
│   ├── window.py        per-wallet GUI controller
│   └── plugin.py        Plugin (Electrum @hooks → GUI)
├── icons/  wallet_util/  LICENSE  README.md
build_zip.py             builds a clean, zipimport-friendly distribution zip
tests/                   smoke + external-zip regression tests

Requirements

• Electrum 4.7.2 or 4.8.0 — the plugin detects which wallet-DB registration API is available (json_db.register_dict on 4.7.2, stored_dict.register_name on 4.8.0) and adapts automatically.
• PyQt6 (bundled with the Electrum desktop GUI).

Wallet compatibility

BAL currently supports standard (single-signature) wallets and hardware wallets supported by Electrum. Multisig wallets and Electrum TrustedCoin (2FA) wallets are not yet supported — see COMPATIBILITY.md for the full compatibility matrix and current status.

Installation

Build the distribution archive

python3 build_zip.py
# -> bal-electrum-plugin.zip  (prints size + SHA-256 for integrity checks)

The builder writes a zipimport-friendly archive (files only, standard DEFLATE, deterministic order) to avoid loader errors seen on some Electrum portable builds.

Install as an external plugin (zip)

1. Electrum → Tools → Plugins → install from file → pick the built zip.
2. Enable Bitcoin After Life and restart Electrum.
3. (Recommended) verify the downloaded zip's SHA-256 matches the value printed by build_zip.py.

Install as an internal plugin

Copy the bal/ directory into your Electrum installation's electrum/plugins/ directory, so that electrum/plugins/bal/manifest.json exists, then enable it from Tools → Plugins.

Inheritance safety: anticipate / postpone

A will transaction is signed with a fixed, immutable locktime and then optionally sent to will-executor servers, which are economically incentivised to broadcast it (they collect fees). Because the locktime is baked into the signed transaction, simply changing the delivery time later is not enough: the old, already-signed transaction keeps living on the will-executors.

The plugin handles the cases as follows (triggered when you press Prepare on the WILL tab):

• Anticipate (new delivery time earlier than the signed locktime, still in the future): a plain rebuild — the transactions are re-created with the new, earlier locktime. No on-chain invalidation and no Bitcoin fee, even if the will was already signed/sent: moving the date earlier only makes the inheritance available sooner, so there is no early-execution risk.
• Expire (new delivery time now in the past): the will is genuinely expired and you are asked to invalidate the old transaction on-chain, then rebuild.
• Postpone (new delivery time later than the signed locktime) on a will that was already signed and/or pushed: the previously committed coins must be invalidated on-chain first, otherwise a will-executor could broadcast the old (earlier-locktime) transaction and execute the inheritance too early. The plugin detects this by comparing the requested locktime with the locktime frozen inside the signed transaction (tx.locktime), and asks you to sign and broadcast an invalidation transaction. After it is broadcast, press Prepare again to rebuild, re-sign and re-send the new (postponed) inheritance. Postponing a will that was never signed/sent just rebuilds it (no on-chain fee).

Transaction list: the "Server" column

The will transaction list shows a dedicated Server column so you always know whether each inheritance transaction is actually stored on the will-executor servers, independently of the row colour:

Label	Meaning
Confirmed on server	the will-executor confirmed it stored the transaction
Sent (not checked)	pushed to the will-executor, not yet re-checked
Send failed / Not on server	push failed or the server no longer has it
Signed (not sent)	signed locally, not sent to any will-executor
Not sent	not signed/sent yet

Hovering the cell shows a tooltip with the will-executor URL and the current state.

Testing

Run the tests with the runtime environment active (see HANDOFF.md §3 for the two venvs and how to activate them):

# imports + behavior
QT_QPA_PLATFORM=offscreen python3 tests/smoke_test.py electrum.plugins.bal

# external-zip loading regression (run after build_zip.py)
QT_QPA_PLATFORM=offscreen python3 tests/external_zip_test.py bal-electrum-plugin.zip

⚠️ Safety

This plugin builds real Bitcoin inheritance transactions with time-locks. Test on testnet or a fund-less wallet first, and review the generated transactions before broadcasting.

License

MIT — see bal/LICENSE.