Systems and protocol engineer in Ostrava, Czechia. I build the layer underneath — consensus, cryptography, storage engines, P2P networking — and the tooling that keeps large estates observable. Twelve years of Python, increasingly Rust.

bismuth — the first blockchain protocol and platform written from scratch in Python. In development since 2015, fair-launched on 1 May 2017 with no ICO and no premine, in continuous production ever since. Full node stack: P2P networking, SQLite ledger with schema migrations, block and transaction validation, mining, wallets, explorers, REST APIs — plus the Hypernode second layer and the "Crystals" plugin system behind on-chain tokens, aliases, a DEX, and cross-chain bridges to Ethereum and BSC.

nado — a phone-mineable, fair-launch, post-quantum chain. Proof-of-work's hash race is replaced by a deterministic, beacon-keyed weighted draw: one hash decides each block's producer, so faster hardware confers no advantage and there is nothing to grind. ML-DSA-44 (NIST FIPS 204) signatures in pure Python with a byte-compatible JavaScript implementation, so a zero-install browser page — wallet, miner, explorer, and alias manager at once — reproduces every address and transaction ID bit-for-bit. A STARK-proven execution layer (field-native zkVM) carries on-chain games, shielded transfers, and end-to-end-encrypted messaging.

Testnet-stage alpha — not mainnet-launched. The alphanet rerolls as consensus changes land. Run it at your own risk; don't secure value of consequence with it yet.

• Kučera, J., Hovland, G. — Tail Removal Block Validation: Implementation and Analysis. Modeling, Identification and Control 39(3), 2018. First author; deployed to the live Bismuth mainnet, cutting block times over 190 s from 5.4% to under 1% of blocks.
• Hovland, G., Kučera, J. — Nonlinear Feedback Control and Stability Analysis of a Proof-of-Work Blockchain. MIC 38(4), 2017. Cited in IBM patent US 10,880,073.

A family of small, single-purpose desktop tools that share one design: drop files in, press Start, get the result. Every one ships as a standalone build for Windows, Linux and macOS on each release (no Python to install), self-tests its frozen binary in CI, previews before it writes, never leaves a partial file, and kills every helper it spawned when it quits.

	whisperer	Batch subtitle generator — Whisper via faster-whisper or whisper.cpp, CPU or CUDA. Cue timing snapped to detected speech, resync of existing subtitles, soft-subtitle muxing.
	speech-splitter	Whisper + YAMNet pipeline turning raw recordings into Hugging Face-ready TTS training datasets. Produced the Czech corpora behind the Chatterbox-TTS-Czech fine-tune.
	videer	FFmpeg/AviSynth+ encoding GUI with QTGMC deinterlacing, CUDA and VMAF scoring.
	video-duplicate-finder	Finds duplicate videos by perceptual fingerprint, not file name.
	nameer	Renames videos after what is inside them — codec, resolution, fps, bitrate, audio, languages — from a template.
	exifer	Sets photo and video dates — file system and EXIF — from a fixed date, the file name, or the file's own metadata.
	11copy	Folder synchronisation: one-way backup, two-way, mirror; preview first, atomic copies, verification.
	edge-tts-gui	Batch text-to-speech through the Microsoft Edge voices.
	titulkovač	Repairs subtitle files and the broken Czech charsets they come in.
	ollama-batch-processor	Batch LLM pipelines over local Ollama — translation, chunking, chained operations.
	ezcoder	Message encryption with a GUI: hybrid post-quantum (X25519 + ML-KEM-768, Ed25519 + ML-DSA-65), Double Ratchet sessions.
	screen-monitor · mandatum	Rust client/server systems for Windows fleets: live screen monitoring and remote task execution.

	dynatrace-mass-management	Self-hosted Tornado portal for bulk operations across many Dynatrace tenants via the API.
	sshauto	Automate repetitive SSH tasks — a lightweight alternative to Ansible.

• firmostat.cz — Czech companies database aggregating 1M+ records from ARES and the Commercial & Insolvency Registers into PostgreSQL; scrapers plus REST API.
• slopinky.cz — auto-translated Czech current-events encyclopedia, built on an RSS/Trends ingestion and headless-Claude editorial pipeline (draft / review / translate).

Eight-plus years of enterprise observability engineering for global manufacturing and government clients — Dynatrace, CheckMK, Nimsoft/Ekara across estates of roughly 15,000 hosts.

bismuth.cz · nadochain.com · LinkedIn · kucera@protonmail.com