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The Ghost Pen in black color with a UV light attachment cap lying flat down on white surface.
GHOST PEN shining on a secret private key bitcoin password making the invisible visible
GHOST PEN user looking at a Shieldfolio private key notebook and a bitcoin password
Ghost Pen being used to reveal a private key password for a bitcoin cryptocurrency account


Ghost Pen for Cryptocurrency Private Keys and Passwords



The Ghost pen is the ultimate way to hide your Private keys and passwords. It is a permanent water spill-resistant (not waterproof) marker with low visibility ink that makes it difficult for anyone to see your writing. Use the Built-in UV light to reveal your hidden text clearly, which ensures your total privacy and security against someone trying to steal your crypto. 



My name is Freddy Hernandez; I was born and raised in Los Angeles, California. I am a family man with a passion for learning and became the founder of Shieldfolio Inc.,a company that creates useful tools for the crypto revolution. These tools help keep important information safe, private, and untraceable.


"...a company that creates useful tools for the crypto revolution."

- Freddy Hernandez, Founder/CEO of Shieldfolio Inc.



Before taking the leap and devoting my work full time to Shieldfolio, I was chained to the corporate world. After working five years with various food distribution companies, I decided that I wanted to run my own business, so I purchased a bread route to exercise my entrepreneurial side. I then ran my franchise for over six years but always knew I was destined for more but not sure what yet.

It was not until 2017 when I heard about Bitcoin that I saw my next venture. I was immediately intrigued and would spend hours after a long day’s work researching and learning everything I could in this exciting but challenging new world. I’ve always had a passion for working with computers, whether it was fixing or building them; I knew the crypto world was just where I need to be.



"I knew the crypto world was just where I needed to be."



In 2019, I created the Shieldfolio Stonebook™️. The notebook is made from crushed stone paper, 100% waterproof, and includes an invisible ink marker for writing. The book is intended to keep private keys and passwords safe from getting lost or misplaced when creating a digital wallet. It also contains a manual encryption method called Shieldcrypt©️ to help prevent private keys from getting hacked.

I plan to innovate and motivate others to adapt to this new world that will soon be our modern-day currency!

Thanks for reading and taking the time to follow my journey!

Freddy Hernandez
CEO/Founder of Shieldfolio Inc.



Store 50+ Crypto wallet's

* Private Keys   

​* Recovery Phrases  

​* Usernames & Passwords  

​* 2FA's  (Two-Factor Authentication)

​* Notes 


The Ghost Pen protects you from revealing your information by using special ghost ink to hide plain text. The text is only clearly legible in UV Light and specific lighting conditions.


Protection from:

* Lurking eyes

* Photo snapshots

* Search & seizure confiscation

* Nosy people


Shieldcrypt works by concealing critical characters of your cryptocurrency private key, making it useless to a thief.

Designed in America


The Shieldfolio Stonebook is designed by our team in California.

Exceptional customer


We are available 7 days a week to answer any questions you may have.

Pre-order now


Or we will refund your purchase, no questions asked.

The Ghost Pen in black color with a UV light attachment cap lying flat down on white surface.

Ghost Pen for Cryptocurrency Private Keys and Passwords



You have questions. We have answers.

  • Is the Stonebook Secure?

    Stonebook is as secure as you want it to be. It can be stored in a safe, or kept on you personally when using the Shieldcrypt encryption or Ghost Ink.

  • Can't I Just Use A Notebook To Write Keys In?

    Of course! But you are putting your valuable private keys, passwords, and more at risk of the elements and prying eyes. Our Stonebook pages are virtually indestructible and feature paper encryption and Ghost Ink functionality.

  • What Is The Shieldfolio Stonebook Made Of?

    80% limestone powder and 20% HD polyethylene. Limestone, one of the most abundant raw materials and is sourced as a waste product from quarries. The plastic, which serves as a binding agent, is obtained from old plastic bottles, from maize or sugar cane waste.

  • Is the Stonebook Fireproof

    The Stonebook is not fireproof. The resin that binds with the Stone has a low melting point. 

  • Is the ghost pen writing Invisible?

    It's very similar. The writing is only visible in UV light and certain other lighting conditions. When seen indoors, the text is hidden to the naked eye.

  • How Long Do Stonebooks Last?

    The Stonebook is virtually indestructible if kept out of prolonged sunlight. When exposed to permanent sunlight for 3-6 months, stone paper will start to turn brittle and decompose. 

  • Is Stonebook "Paper" More Sustainable Than Recycled Paper?

    Yes, the stone paper we use  is more environmental-friendly and sustainable than recycled paper. Hardly any fresh fibers are needed to recycle paper, but a lot of drinking water, bleach and other chemicals. There is still a lot of waste, more than in the production of virgin fiber paper.

  • Can I burry my Stonebook Underground?

    Yes, only when using ink from a ballpoint pen to store your information. 
    The paper has Non-Biodegradable elements within it in which insects cannot eat the paper. The Stonebook can also stay hidden to metal detectors, which gives it an advantage over metal wallets.

    Currently, the ghost ink pen is not suitable for this application.

  • Does the Ghost Pen ink ever come off?

    This Invisible ink is Permanent, but depending on the elements you expose it to determines the longevity. If always kept indoors at room temperature, this ink should last the lifetime of the paper it's written on. So essentially theirs no Expiration date to this ink.

  • Is the Ghost pen ink waterproof?

    Currently the Ghost pen ink solution is Spill resistant. meaning it is not suitable for a prolonged amount of time in moisture or water conditions. 

  • Why does ink from the Ghost pen overflow to other pages?

    Because Stone paper is an emerging new paper product, we are currently working on making the ink less visible throughout the pages. Meanwhile, It is best to skip every other page when writing to avoid overflow of ink through the pages. This process will preserve your writing more effectively. We are currently working on improving this. 

    If you have any questions or concerns, don't hesitate to contact us

  • Do you ship outside the U.S.?

    Yes, please view our shipping information here for more details.