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Hashcash is a cryptographic proof-of-work system originally used to limit email spam and later adapted for Bitcoin mining. Learn how this protocol works in our glossary at Paybis, a trusted crypto exchange offering more than just trading. We break down complex blockchain concepts for both retail users and B2B teams. Understanding hashcash is essential if you're exploring mining, Bitcoin’s design, or crypto security in general. With Paybis, you get low fees, secure transactions, and deep educational content to support your journey. Discover how hashcash helped shape blockchain’s early foundations.