Free, open-source and self-hosted CAPTCHA alternative to reCAPTCHA. Privacy-first and powered by proof-of-work and instrumentation challenges.
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Jun 11, 2026 - JavaScript
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proof-of-work
Here are 886 public repositories matching this topic...
A collection about awesome blockchains - open distributed public databases w/ crypto hashes incl. git ;-). Blockchains are the new tulips 🌷🌷🌷. Distributed is the new centralized.
git ethereum blockchain transactions sha256 distributed-database proof-of-work content-addressable-storage tx cryptohash tulipmania merkletree universum proof-of-waste
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Feb 10, 2023 - Ruby
A no-nonsense CAPTCHA system with seamless UX | Backend component
rust privacy captcha self-hosted spam-protection ddos-mitigation proof-of-work self-host ddos-protection actix-web mcaptcha
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Oct 7, 2025 - Rust
GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.
recaptcha captcha svelte wcag spam-prevention spam-protection antispam spam-filtering spam-detection ddos-mitigation proof-of-work captcha-alternative ddos-protection webcomponent hcaptcha spam-api
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Jun 11, 2026 - TypeScript
a memory-bound graph-theoretic proof-of-work system
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Apr 18, 2026 - C++
Go Implementation of the Spacemesh protocol full node. 💾⏰💪
go golang blockchain p2p consensus cryptocurrencies decentralization dag proof-of-work blockmesh proof-of-space proof-of-space-time spacemesh
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Nov 20, 2025 - Go
Escalation of Privilege to the root through sudo binary with chroot option. CVE-2025-32463
linux docker tools proof-of-concept exploit docker-container scanner docker-image sudo poc vulnerability privilege-escalation proof-of-work lpe eop privilege-escalation-exploits escalate-privilages
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Nov 19, 2025 - Shell
The widget and docs for the proof of work challenge used in Friendly Captcha. Protect your websites and online services from spam and abuse with Friendly Captcha, a privacy-first anti-bot solution.
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May 19, 2026 - TypeScript
Project dedicated to fight Layer 7 DDoS with proof of work, with an additional WAF and controller. Completed with full set of features and containerized for rapid and lightweight deployment.
nodejs security typescript ddos proxy-server waf cybersecurity spam-protection koa2 netsec spam-filtering network-security ddos-mitigation proof-of-work ddos-protection
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Jun 1, 2026 - TypeScript
Open-source, frictionless CAPTCHA and bot defense. A privacy-focused alternative to reCAPTCHA and hCaptcha.
security spam privacy recaptcha captcha spam-protection antispam spam-detection ddos-mitigation bot-detection proof-of-work captcha-alternative self-host ddos-protection invisible-captcha human-verification hcaptcha procaptcha frictionless-captcha bot-defense
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Jun 12, 2026 - TypeScript
git is a blockchain. Start your commit hashes with 00000000 like a real blockchain should.
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Oct 27, 2024 - C++
blockchain (crypto) tools, libraries & scripts in ruby
ruby blockchain oracle ledger transactions solidity sha256 finite-fields distributed-database gems proof-of-work tx hashtree cryptohash elliptic blockchain-lite merkletree cryptos cryptoquotes
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Dec 18, 2023 - Ruby
JeChain decentralized application platform and smart contract blockchain network
distributed-systems cryptography cloud network smart-contracts decentralized blockchain p2p cryptocurrency blockchain-network proof-of-work p2p-network full-node jechain
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Jun 10, 2026 - JavaScript
Cap backend server build on Cloudflare worker, modern open-source CAPTCHA alternative using SHA-256 proof-of-work.
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Sep 16, 2025 - HTML
Independent, privacy-first, self-hostable PoW CAPTCHA service made in EU
security protection captcha self-hosted spam-protection anti-bot proof-of-work captcha-alternative ddos-protection anti-abuse invisible-captcha
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Jun 12, 2026 - Go
A SDK for implementing blockchain-based digital currencies
cryptography lua peer-to-peer smart-contracts blockchain cryptocurrency proof-of-stake proof-of-work digital-currency schnorr-signatures
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Oct 30, 2020 - C++
Open-source, invisible CAPTCHA that detects AI agents, bots, and headless browsers via 40+ behavioral signals, device & TLS fingerprinting, and SHA-256 proof of work. Self-hosted and privacy-first.
nodejs python go security captcha self-hosted web-security fingerprinting anti-bot bot-detection proof-of-work invisible-captcha behavioral-analysis selenium-detector scraping-protection tls-fingerprinting headless-browser-detection ai-bot-detection puppeteer-detection playwright-detection
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Jun 11, 2026 - JavaScript
C/C++ implementation of Ethash and ProgPoW – the Ethereum Proof of Work algorithms
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Jun 8, 2025 - C++
⋰·⋰ Feeless is a Nano cryptocurrency node, wallet, tools, and Rust crate. https://feeless.dev/
money bitcoin decentralized nano cryptocurrency crate pow proof-of-work rust-crate nano-currency nano-cryptocurrency nano-node cryptocurrency-node nakamoto-coefficient
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Nov 18, 2024 - Rust
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