Fast Tor v3 vanity address generator for system operators
mkp224o by cathugger is a command-line utility that generates vanity Tor v3 .onion addresses for memorable hidden-service URLs. The tool brute-forces ed25519 service keys using optimized assembly and multiple cryptographic backends, searching for user-specified prefixes with multi-threaded and batch modes to accelerate discovery on desktop CPUs. It supports prefix and regular-expression filtering plus YAML output for automation, and runs on Windows via precompiled binaries or by building with MSYS2. Operators and privacy-conscious administrators gain a local method to produce branded addresses.
How the tool finds vanity .onion prefixes
The tool generates standard ed25519 service keys and tests resulting Tor v3 addresses against user filters, using brute-force key generation rather than any external service. It includes multiple optimized cryptographic backends, named ref10, donna, and sandy, and uses specialized assembly paths to increase throughput. A batch generation mode is available and can deliver over 10x performance improvements compared with single-run approaches, making long-prefix searches more feasible on CPU-based systems.
Does a brute-force run affect system responsiveness?
Yes, the implementation is explicitly multi-threaded to use all available CPU cores, so searches produce sustained processor load while running. On desktop Windows machines the binaries run as a foreground command-line process or under MSYS2 builds; expect the tool to compete with other CPU-bound tasks for cycles. Users should plan runs during idle windows or on machines not performing time-sensitive workloads to avoid interference.
Is the process safe and auditable for privacy workflows?
The generator is open-source and performs key generation locally, producing standard ed25519 keys on the host machine. It has been vetted by privacy community reviewers and appears in official project guidance as a recommended option for advanced onion service setup. The codebase and local operation allow independent inspection, which suits users who require auditable, offline key creation rather than cloud-based or third-party services.
Who gets the most value and what skill level is required?
The tool targets technically proficient operators: system administrators and privacy-focused operators who can run command-line builds or use provided Windows binaries and integrate YAML outputs into deployment scripts. Casual or non-technical users may face a learning curve because the workflow emphasizes scripting and automation. Compared with other CPU-based generators, the implementation is widely regarded as the industry standard for speed on commodity hardware.
Recommended for technical operators who accept resource and time trade-offs
The tool is a capable option for technically proficient operators who need branded Tor v3 addresses and can tolerate sustained CPU and time costs inherent to brute-force searches. For long-running jobs use a non-critical desktop or an isolated machine and monitor system temperatures to reduce hardware risk. Novice users should evaluate GUI or hosted alternatives before committing to extended local generation. Recommended.
Pros
Batch mode can deliver over 10x performance improvement for CPU searches
Supports prefix and regular-expression filtering for precise address targeting
YAML output enables integration with deployment and automation scripts
Open-source codebase vetted by the privacy community
Cons
Sustained high CPU load during searches can disrupt other desktop tasks
Command-line operation and builds require technical experience
Long prefixes may take weeks or years due to exponential difficulty
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