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Fulcrum

Fulcrum is open-source C++20 server software that provides SPV access to Bitcoin Cash, Bitcoin and Litecoin clients by connecting to a supported full node through JSON-RPC.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Fulcrum — OpenViST project profile in Infrastructure.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use Fulcrum when you need to serve SPV access for a supported coin from a server connected to its full node.

Who it is for

  • Operators who want to host SPV server access for Bitcoin Cash clients.
  • Operators serving Bitcoin or Litecoin clients who can provide the corresponding supported full node.

Documented uses

  • Run an SPV server for Bitcoin Cash clients.
  • Provide SPV server access for Bitcoin clients.
  • Provide SPV server access for Litecoin clients.
Before you choose

Requirements & limits

The project is open source under GPLv3. The README describes prebuilt static binaries and source compilation options.

  • A supported full node with JSON-RPC enabled is required; txindex must be enabled and pruning disabled.
  • For Litecoin, the README supports Litecoin Core v0.17.0 or later and names no other supported full node.
  • Recommended hardware is a 64-bit CPU, at least 1 GB RAM and an SSD; the README gives approximate mainnet disk figures of 40 GB for BCH and 133 GB for BTC, dated August 2023.
  • Building from source requires Qt Core and Qt Networking 5.15.2 or later and a modern 64-bit C++20 compiler.
  • ZeroMQ and miniupnpc are optional dependencies for additional operation and networking options.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Compile Fulcrum from source on Linux or macOS

Build Fulcrum from its project file using the documented command-line process.

Before you start

  • Qt Core and Qt Networking 5.15.2 or later.
  • A modern 64-bit C++20 compiler.
  • On Linux, the required Qt development libraries, qmake in PATH, and libbz2-dev.

Steps

  1. Ensure qmake is in PATH and the required Qt development libraries are installed.

  2. Run qmake to generate the Makefile.

  3. Run the command below; replace 8 with the number of cores on the machine.

    Documented command
    make -j8

Expected outcome

The documented command-line build process produces a Fulcrum build from source.

Guide limitations

  • The command-line instructions are specified for Linux and macOS.
  • Qt 5.15.1 and earlier are not supported.
  • The README also describes a Qt Creator build path, but the outcome of any particular build is not independently verified.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
17 October 2026
Original website title
cculianu/Fulcrum · Official homepage title · retained in its source language
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