Systems and protocol engineer in Ostrava, Czechia — consensus, cryptography, storage, P2P, and observability tooling. Twelve years of Python, increasingly Rust.
bismuth — the first blockchain written from scratch in Python. Fair-launched 1 May 2017, no ICO or premine, in production since. Full node stack, the Hypernode second layer, on-chain tokens, a DEX and bridges to Ethereum and BSC.
nado — phone-mineable, fair-launch, post-quantum chain. A beacon-keyed weighted draw replaces the hash race, so faster hardware gives no advantage. ML-DSA-44 signatures, a STARK-proven zkVM, and a zero-install browser wallet and miner. Hardware side: nado-hardware.
Also: HoboNickels — a 2014 proof-of-stake coin revived on a modern toolchain.
- Kučera, Hovland — Tail Removal Block Validation. MIC 39(3), 2018. Deployed on Bismuth mainnet.
- Hovland, Kučera — Nonlinear Feedback Control of a Proof-of-Work Blockchain. MIC 38(4), 2017. Cited in IBM patent US 10,880,073.
- Kučera — Proof of Secure Element Attestation Without a Certificate Authority. Zenodo, 2026. Reference implementation: posea.
- stark-soundness-analysis — concrete soundness modelling for FRI-based STARKs.
- windows-tpm-claim-format — the undocumented Windows TPM key-attestation blob layout.
- tropic01-explorer — interactive explorer for the TROPIC01 secure element model.
Drop files in, press Start, get the result. Standalone builds for Windows, Linux and macOS on every release.
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whisperer | Batch subtitle generator — Whisper on CPU or CUDA, speech-snapped timing, resync, muxing. |
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summoner | Photo developer: raws or JPEGs in, developed photos out, per-photo auto analysis. |
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diskmaster | Drive health monitor: SMART, health score, surface scans naming affected files. |
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speech-splitter | Raw recordings to TTS training datasets. Behind Chatterbox-TTS-Czech. |
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rtl-spectrum | RTL-SDR receiver: listen, sweep, auto-record voice channels, ADS-B map. |
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videer | FFmpeg/AviSynth+ encoding GUI with QTGMC, CUDA and VMAF. |
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video-duplicate-finder | Finds duplicate videos by perceptual fingerprint. |
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nameer | Renames videos from their codec, resolution and language metadata. |
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exifer | Sets photo and video dates from a fixed date, file name or metadata. |
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11copy | Folder sync: backup, two-way, mirror; preview first, verified copies. |
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edge-tts-gui | Batch text-to-speech with Microsoft Edge voices. |
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titulkovač | Repairs subtitle files and broken Czech charsets. |
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ollama-batch-processor | Batch LLM pipelines over local Ollama. |
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ezcoder | Hybrid post-quantum message encryption with Double Ratchet sessions. |
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screen-monitor · mandatum | Rust fleet tools for Windows: live screen monitoring, remote task execution. |
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dynatrace-mass-management | Bulk operations across many Dynatrace tenants. |
| sshauto | Lightweight SSH automation, an Ansible alternative. | |
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truewind | Physics-first browser sailing simulator with real coastlines and AI racing. |
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age-of-gore | Procedural Age of Empires II-style RTS in WebGL2 with a Rust relay. |
| rag-sqlite | Minimal, dependency-free RAG on SQLite. | |
| discord-security-bot | Discord anti-spam with a daily Claude security review. | |
| chatterbox-model-trainer | Trains Chatterbox-TTS voices from speech-splitter datasets. |
- firmostat.cz — Czech company database, 1M+ records from ARES and the public registers.
- slopinky.cz — auto-translated Czech current-events encyclopedia.
Eight-plus years of enterprise observability — Dynatrace, CheckMK, Nimsoft/Ekara — across estates of ~15,000 hosts.
bismuth.cz · nadochain.com · LinkedIn · kucera@protonmail.com