HashCool is a browser extension that brings the advantages of blockchain technology to users and businesses, enabling the authentication and intellectual property protection of various electronic documents. This includes contracts, deeds, songs, texts, images, photos, and videos. Additionally, it allows for the creation of permanent visual records of websites, including social media posts and news articles.

The application generates a unique hash for each file, which is stored in both the off-chain Hash Institute and the Ethereum blockchain. This hash serves as a digital signature, providing undeniable proof of ownership and timestamping. HashCool ensures that each content can only be registered once, preventing duplication by different users or even the original content owner. A promotional offer currently allows for unlimited free registrations for the first 30 days.