Books & Study Packs

Online Books (Digital)

  • Buy a single Level or the Full 6-Level Bundle
  • Delivered instantly via a private Telegram channel
  • One-time join link — self-expires once you join
  • No ads, no distractions — pure content
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Physical Books (Printed)

  • Vol.1 — Levels 01-03 & Vol.2 — Levels 04-06
  • Printed copies delivered to your address
  • Available in English & Sinhala editions
  • Perfect for offline, distraction-free learning
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Q&A

Is The Crypto Folder really 100% free?
Yes. Every lesson on this site is free to read with zero paywalls. The Books & Study Packs above are optional extras for people who want a downloadable or printed version.
What's the difference between Online and Physical books?
Online books are delivered digitally through a private Telegram channel right after purchase. Physical books are printed copies delivered to your address.
How does the Telegram join link work?
After purchase you'll get a one-time invite link to the private channel. It's valid for a single use and expires automatically once you join, to keep the content secure.
Can I buy just one level instead of the full set?
Yes — both online and physical books can be bought level-by-level, or as a complete 6-level bundle at a better price.
Do you have content in Sinhala too?
Yes, every lesson is available in both English and Sinhala. Use the language switcher (🌐) in the top menu to change languages.
How do I stay updated on new lessons and books?
Join our Telegram community — announcements, new level releases, and book drops are posted there first.
Hashing & Encryption : The Difference and Usage in Blockchain
Hashing & Encryption : මොකක්ද මේ දෙකේ වෙනස සහ භාවිතය
Hashing and the SHA-256 Algorithm: The Mathematical Seal of Immutability
Hashing සහ SHA-256 ඇල්ගොරිතමය: දත්ත වෙනස් කළ නොහැකි ගණිතමය මුද්‍රාව
Asymmetric Cryptography: Building Digital Trust Through Private Keys
Asymmetric Cryptography: රහස්‍ය යතුරු මගින් ඩිජිටල් විශ්වාසය ගොඩනැගීම
Can a Blockchain Be Hacked?   (Early Stage Risk & Digital Signatures)
Blockchain එකක් Hack කළ හැකිද?  (Early Stage Risk & Digital Signatures)