Origami 721

Print the ownership transfer receipt

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ETHBerlin-Crypto-POS-Receipt

Hackers : Julien Béranger and Francois Branciard

Hacking an Epson P20 POS mobile printer Receipt for crypto

Alert: POS = Point of Sale not proof of stake ;)

User stories

Payment User story

As a customer, when I make a payment in real life, I want a paper receipt of my transaction as today. It's needed for accounting service. Exemple:

  • You will buy your coffee with crypto in Starbucks soon,
  • Today Starbucks gives you a paper receipt for your fiat payment,
  • Paper receipt for the crypto payment with the transaction you can then QR code to check.

Smart Contract User story

Smart contract can design forms of interactions between users: Marketplace (bid/ask), Auctions, Ticketing. These specific new kinds of transactions will need paper receipts to

  • details date, amount etc ...
  • be tracked into existing accounting system for company or personal budget management.

For this point, we will take example of iExec Marketplace (computation ressources Marketplace) where a receipt of all the whole process can be printed, showing what the user has paid and what’s the workers’ reward for this off-chain computation.

Property Receipt User story

If you attach ERC721 to real object in life that has value: Art, gold bar, supply chain etc ... When you transfer the new ownership in real life by physically interact with your client. The owner triggers the ERC721 transfer. This new previous owner gives the object and a receipt that shows the ERC721 transfer transaction.
The new owner can check if the transaction is confirmed and if so, it can safely go away.

PoC

We do PoC on the Property Receipt User story :

  • The creator of the origami has created an ERC721 et mint a token for the origami created.
  • He puts the token id on the paper object.
  • The buyer pays for the object (fiat or crypto)
  • The creator gives the object and the receipt of the new ownership to the buyer.
  • The buyer does not go away until he has this receipt: to be able to proof his new ownership and sell it to others.

More features to come:

  • before buying the object, ask the seller (owner) to proof his current ownership of the ERC721 token. (signed some message)
  • before selling to the new owner. ask the buyer to confirmed his idendity to receive this token ownership. (signed some message)

We have faced some issues with the printer drivers on mac. So we did not succeed to do some code for the solution but we mock up the story and illustrate the Property Receipt in this short video :

https://youtu.be/eRXa1FLQjJE

When Mainnet?

It is on mainnet !! The token id 1 you see in the video is one record on this ERC721.

        Origami721: 0x8adfe7afc049d2a10b2b715b1d1d138e3f1865be
        ... 0x1758b2dbb3e14f9aead54d4fef6383f341285f592f94d40d99929c7abbb93d50

The current ower of this origami :

currentOwner

Mint has been closed. So this is a unique 1 item Collection !!! What is your offer for this beautiful origami?

Token url is associated to an ipfs link. It is a of the origami picture with the token id visible :

origami picture

how to build

npm i
truffle compile
truffle migrate

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