1. 
   D33r-Gee commented at 3:19 pm on April 30, 2025: none

   based on the QML PR 424. For evaluation purposes only!

   GUI Integration for UTXO Snapshot Loading

   Overview

   This PR adds initial GUI support for loading a UTXO snapshot, building on Bitcoin Core’s assumeutxo infrastructure.

   What This PR Does

   1. Adds a basic GUI interface for loading UTXO snapshots via the Options Dialog panel
   2. Provides visual confirmation of snapshot activation
   3. Adds a snapshot progress notification bar accessible via a handler

   Implementation Details

   Core Components Modified

   1. Node Interface (src/node/interfaces.cpp)

   • Implements snapshotLoad() based on the loadtxoutset RPC

   2. QT Integration (src/qt/optionsdialog.cpp)

   • Manages snapshot loading state and progress
   • makes use of a worker class to manage snapshot metadata (src/qt/snapshotmodel.cpp)
   • Provides progress updates via a progress bar

   Key Design Decisions

   2. Extensibility

   • Interface designed to accommodate future assumeutxo changes
   • Error handling framework in place

   Testing Instructions

   1. Build
   2. Launch Bitcoin Core GUI (bitcoin-qt)
   3. Navigate to Settings -> Options
   4. Click Load Snapshot button
   5. Follow pop-up instructions
   6. Test with sample snapshot:

   https://bitcoin-snapshots.jaonoctus.dev/ (No affiliation with the maintainer of this site. As always “Don’t trust! Verify!”)

   Launch bitcoin-qt on signet Navigate to Settings -> Options Click the “Load Snapshot…” button Navigate to where your snapshot file is. The snapshot was downloaded from here Click “Yes” Wait for the snapshot to load and for this pop-up to appear and click “Ok” Verify the “chain_snapshot” directory is present in your datadir

   Expected Behavior

   • File selection dialog works
   • Success/failure state properly displayed
   • Node becomes usable while background validation continues

   Notes for Reviewers

   • This is a POC so all feedback is welcomed
   • I am not a designer so please feel free to chime in if there’s a more elegant way to achieve this

   This is a work in progress - feedback welcome on the approach and implementation details.

2. interface: Expose load utxo snapshot functionality

   Expose load/activate AssumeUTXO snapshot functionaility so that it can be laoded trhough the GUI.

   5e0b38e4c7
3. poc: Load snapshot through the options dialog

   This is a quick and dirty POC to showcase and test the load snapshot functionality. This is by no means meant to be a robust approach...

   abce36797a
4. poc: Add notification handler to display UTXO snapshot Load Progress

   This serves as a quick and dirty POC to display a progress bar when an AssumeUTXO snapshot is loading. The gui code is by no means production or deployment ready. For backend evaluation pruposes only...

   fe687b38f1
5. 
   DrahtBot commented at 3:19 pm on April 30, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Reviews

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   Type	Reviewers
   Concept ACK	Sjors

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6. 
   D33r-Gee commented at 3:51 pm on April 30, 2025: none

   friendly ping @Sjors
7. 
   Sjors commented at 10:05 am on May 1, 2025: member

   Concept ACK

   Although I’m not sure how much effort we should put into maintaining the current GUI codebase (if it’s going to be replaced with QML eventually), this particular feature is high on my wish list. And the code changes here seem very simple. So I’m happy to test and review it.

   ---

   The first commit which touches the node interface should eventually be PR’d to bitcoin/bitcoin. But let’s wait with that until this PR has enough concept ACK and some initial review.

Contributors
D33r-Gee DrahtBot Sjors