This looks very nice !
I saw your website that you are using hologram to protect the password of the Encrypted Private Key.
Can you explain in detail on how the encrypted private and its password are stored and what is the procedure to sweep the private key into say an electrum wallet
If you go to bitaddress.org and choose to print paper wallets... you can encrypt the Private key. The only way to use the private key is with a password. That password can be anything... I make them 10 digits long to make them extremely to nearly impossible to brute force. The encryption/decrypting process is time consuming.
So, when I create the keys for the Papersafe Note. I first print the random password from a spreadsheet like program. This is done in bulk... its total random and it doesnt matter what the password is.. I type that random password into bitaddrsss.org to encrypt the private key ... The public address and the encrypted private key are then printed on the notes.
To redeem the funds from an encrypted private key ..you would scan the private key QR code ...I use my phone and blockchain.info app..there are other wallet apps that do this also.... It then asks for the password....type in the password ....it decrypts to a private key that can then spend the funds....
A PaperSafe Satoshi Note has the encrypted private key and public address printed visibly. The Password is covered with a tamper evident scratch off and a self destructing holographic sticker. To view the Password , you have to peel the hologram sticker off then scratch the scratchoff, revealing the password.
To reveal the password... The hologram has to be removed to access the scratch off.... this is not a quick rip it off hologram , but with care will do what it is meant to do...
First thing you want to do is warm up the area ... since you would be destroying the note by removing the hologram... rubbing you finger back and forth across the area to create friction will warm the adhesive enough to release without tearing paper. a hair dryer may work also.. This is a self destruction hologram... it will leave a lot of the adhesive and parts of the hologram behind.. If the paper starts to tear.... then it needs to be warmed up a little more .. I found that a sharp pointed blade like an xacto hobby knife, to start the process was helpful... once the hologram is removed there will be a lot of sticky on the scratch off.... the back of a knife is useful to gently scrape it off....once most of the sticky is lightly scraped off...then a coin can be used to scratch and reveal the password. I use a Bitcoin Penny to do this ... just because
If you are uneasy with using the preprinted key on the note. I suggest funding the address with a few bits to register the note to the blockchain and use the NFC tag... that is on the back with Greenaddress.it's android app for easy login, essential making the Satoshi note an HD paper wallet with an unlimited number of user supplied keys.
This is just one use for the NFC tag. There are many others and even more undiscovered..
Papersafe Satoshi notes are shipped with the NFC tag programmed with Trustpoint's BlackSeal authentication app for anticounterfieting verification... A cryptographic signed message stored on the tag verifies that PaperSafe.org programmed the tag and can not be cloned.