Inkrypt for Android
Inkrypt for Android is currently available on Google Play and source code is available on GitHub.
Current version provides generation and verification of Argon2 hashes. Most important feature in pipeline is the OCR - optical character recognition. It will be possible to use mobile phone to take a picture of the bill, and then hashes will be sent to server for verification and transfer of ownership.
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Inkrypt for iOS
Inkrypt for iOS is currently under development and will be available soon.
Inkrypt for Windows
Requirements for Inkrypt for Windows are currently in development. The idea is to have a Windows application which will enable easy design and mass printing of Inkrypt bills.
POS device
It will be very useful to equip retail stores with devices which can automatically scan Inkrypt bills, transfer ownership from buyer to store owner and print change.
Inkrypt backend
It is indeed possible to transfer ownership by sending SMS or Viber message to issuer of the bill, but that is slow and tedious. It would be much easier to have a server which is always accessible, and which can automatically accept and process ownership transfer requests.