zk1tty / cryptoNFC

the project "Crypto NFC"

CryptoNFC

cryptoNFC provides crypto-backed NFC charge and payments. It uses the decentralized Wavelet network to send PERL tokens from user to user.

Dependencies

• Rust set up to build Wavelet smart contracts; follow the tutorial
• Python3 with additional libraries:
  • cryptography
  • numpy
  • pyserial

Usage

As the owner of the IC card, run python3 client/get_key.py, and use this credential to log into the Wavelet testnet.

In contract/transfer-nfc/, run:

cargo build --release --target wasm32-unknown-unknown

and upload the transfer-nfc.wasm file to the smart contract uploader.

As the party who wants to receive tokens, run:

$ export SERIAL_DEVICE=[path to the serial device of the NFC reader]
$ export CONTRACT_ID=[the ID of the smart contract]
$ export RECIPIENT_ID=[the ID of the recipient of the tokens]
$ python3 client/cryptoNFC.py [number of microPERLs to send]

Then, tap the user's IC card to the IC reader.

How does it work?

By sending tokens to a smart contract associated with an IC card, a user can effectively charge their IC card, and remit those tokens to another party using an IC card reader.

What's going on under the hood?

We use the UID of a ISO/IEC 14443 A/MIFARE card to generate a unique identity for a user in the Wavelet network, which they can use to log in and upload a smart contract which can authorize token to be sent to a third party. By sending tokens to the smart contract via the charge_ic function of the smart contract, the user can providing another party with the contract ID and UID, the user can authorize that party to deduct some tokens using the ic_transaction function of the same contract.

Authors

• Eli Wenig <[e-mail]>
• Norika Kizawa <[e-mail]>