Free, open-source and self-hosted CAPTCHA alternative to reCAPTCHA. Privacy-first and powered by proof-of-work and instrumentation challenges.
-
Updated
Aug 14, 2026 - JavaScript
#
proof-of-work
Here are 1,019 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
-
Updated
Feb 10, 2023 - Ruby
GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.
security privacy recaptcha captcha svelte wcag spam-prevention spam-protection anti-bot antispam spam-detection ddos-mitigation proof-of-work captcha-alternative ddos-protection anti-abuse hcaptcha spam-api
-
Updated
Aug 19, 2026 - TypeScript
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
-
Updated
Oct 7, 2025 - Rust
a memory-bound graph-theoretic proof-of-work system
-
Updated
Jul 24, 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
-
Updated
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
-
Updated
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.
-
Updated
Jun 30, 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
-
Updated
Aug 14, 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
-
Updated
Aug 20, 2026 - TypeScript
git is a blockchain. Start your commit hashes with 00000000 like a real blockchain should.
-
Updated
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
-
Updated
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
-
Updated
Jun 10, 2026 - JavaScript
Cap backend server build on Cloudflare worker, modern open-source CAPTCHA alternative using SHA-256 proof-of-work.
-
Updated
Sep 16, 2025 - HTML
Self-hosted, invisible CAPTCHA that detects AI agents driving real browsers. GDPR, WCAG 2.2 AA, and EAA: no cookies, no third-party data sharing, and no visual or audio puzzle. With a false-positive budget enforced in CI. Proof of work, drop-in for Turnstile and reCAPTCHA.
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
-
Updated
Aug 20, 2026 - JavaScript
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
-
Updated
Aug 20, 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
-
Updated
Oct 30, 2020 - C++
C/C++ implementation of Ethash and ProgPoW – the Ethereum Proof of Work algorithms
-
Updated
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
-
Updated
Nov 18, 2024 - Rust
Improve this page
Add a description, image, and links to the proof-of-work topic page so that developers can more easily learn about it.
Add this topic to your repo
To associate your repository with the proof-of-work topic, visit your repo's landing page and select "manage topics."