The privacy-first, self-hosted CAPTCHA for the modern web.

A collection about awesome blockchains - open distributed public databases w/ crypto hashes incl. git ;-). Blockchains are the new tulips :tulip::tulip::tulip:. Distributed is the new centralized.

A no-nonsense CAPTCHA system with seamless UX | Backend component

GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.

a memory-bound graph-theoretic proof-of-work system

Go Implementation of the Spacemesh protocol full node. 💾⏰💪

Escalation of Privilege to the root through sudo binary with chroot option. CVE-2025-32463

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.

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.

Protect your website from bots with Prosopo Procaptcha

git is a blockchain. Start your commit hashes with 00000000 like a real blockchain should.

blockchain (crypto) tools, libraries & scripts in ruby

JeChain decentralized application platform and smart contract blockchain network

Cap backend server build on Cloudflare worker, modern open-source CAPTCHA alternative using SHA-256 proof-of-work.

A SDK for implementing blockchain-based digital currencies

Independent, privacy-first, self-hostable PoW CAPTCHA service made in EU

C/C++ implementation of Ethash and ProgPoW – the Ethereum Proof of Work algorithms

⋰·⋰ Feeless is a Nano cryptocurrency node, wallet, tools, and Rust crate. https://feeless.dev/

Monero POW mining in Python

BitCore (BTX) - Cryptocurrency 220 Byte Datacarriersize

Detect bots, vision AI agents, and headless browsers through 40+ behavioral signals and SHA-256 proof of work. Self-hosted, privacy-first, and fully open source.

Simple javascript proof-of-work based access for Nginx with virtually no overhead. (Similar to Cloudflare's anti-DDoS feature)

⛓✨ Interactive blockchain built with Node.js

Best of Crypto Books - A collection of books, white papers & more about crypto and blockchains.

Trilio is a blockchain written in Python that utilizes the proof-of-stake concept and helps creating a more smooth and transparent transaction experience, with multiple integrations such as NFT(s) and tokens.

Cyberspace is a permissionless, thermodynamic spatial protocol that uses math to impose locality on a spaceless digital system. It can be used for: AI embodiment and single-presence restriction, trustlessly restricting data access by location, open and interoperable augmented reality layers, and more.

How many confirmations are equivalent to 6 Bitcoin confirmations?

Course content for the Freshman Track at LearnWeb3 - best for intermediates to start diving deeper into various categories of Web3 building

Fabric is an experimental protocol for exchanging information.

Python-based implementation to generate Proof of Work (PoW) tokens and Sentinel tokens for bypassing security mechanisms in OpenAI's ChatGPT and Sora private APIs