• The value of cryptocurrency is rising upon usage
• Transactions have no cost
• The loyalty system is a generator of extra value
• Every NFC terminal is a blockchain node
• No server infrastructure needed
• Extra value goes transparently to UNICEF to help children around the world
• Open Source System
• Green Solution. No intensive mining is needed, just digitally signed transactions on nodes.

Usage:

A retailer who wants to be part of the UNICEF Cryptosystem needs to install NFC terminals in their shop. As terminal hardware will be open source, anyone can build it, any company, so the price can be expected from 50-100 USD at the beginning and lower than 50 USD when massive production starts.
Retail that accepts this loyalty system gives adaptable discounts to all customers, for example, 1%. From that discount, one part goes to Unicef and another to the customer. For example 0.4% to Unicef, and 0.4% to customers. Customers have satisfaction with helping children of the world, but also have interest in getting discounts. The last 0.2% goes to the cryptocurrency system so that cryptocurrency can rise. This is done automatically by getting back to the system this 0.2% in the process of the transaction. This additional value is not generated virtually. In fact, this is real money that cryptocurrency gets as cashback from retail in the form of a discount. The absence of this additional value in crypto makes a small rise in cryptocurrency values vs FIAT value.
Retailers will have the minimum discount to commit to but will be able to give higher (adoptable) discounts e.g for World Children’s Day.
Customers will gladly be the holders of cryptocurrency because they will not lose value with inflation or other potential problems. Setting this additional value percentage can prevent cryptocurrency to rise faster than it should. The best way is to keep the step with the year’s inflation.
First cryptocurrency values are generated through buying crypto for real stable (FIAT) money. In this situation, there must be a small fee per transaction that covers bank transactions. The same is with selling crypto value to FIAT. All further transactions are free because there is no need for additional server infrastructure.
Users of this cryptocurrency can exchange FIAT value back, any time they want, because there is always an exact amount of FIAT currency on a dedicated account to support CryptoCurrency to Fiat retrieval.  When cashback is generated through a loyalty system, crypto volume rises.

Crypto rise example:

Let’s say you buy 100 UNICEF Crypto coins for 100 Dollars.
Then you go to a computer shop that offers a 1% customer loyalty discount for using UNICEF Crypto coin, and you buy a hundred Dollar monitor.
From this transaction, four actual transactions are made:
1) 99 dollars in crypto coins go to the seller
2) 0.4 dollars in crypto coins go to the customer as discount cash back
3) 0.4 dollars in crypto coins go to UNICEF
4) 0.2 dollars in crypto coins go back to the Cryptosystem
This 0.2 USD absence in crypto value lowers the total crypto value to 99.98. A number of FIAT values remains the same 100USD, so the worth of one crypto coin rises to 1,0002 USD instead of the ex-crypto value of 1 USD.

This setup also benefits all users:

1. Seller doesn’t have any transfer costs.
2. Customer gets a discount as cashback
3. UNICEF gets a donation
4. Overall cryptocurrency value is increased to 1.002 USD which benefits all the users.

About Us:

Digital Logic is a manufacturer of the uFR NFC Reader series https://www.d-logic.com/nfc-rfid-reader-sdk/ and developer of a Java Card Applet for digital signing with NFC cards. NFC readers and Crypto NFC cards are an essential part of this kind of use to make the system easy and highly secure.

The system, technical details:

This ecosystem consists of:
BlockChain Terminal – Small device with a display, open source hardware with NFC interface, and wireless connection. Stored in any retail that is part of the ecosystem. This terminal is a payment device but at the same time one of the decentralized nodes, so no other server or centralized system is needed. This terminal needs to support Private Key Infrastructure (further in document PKI). Terminal support of secure elements, secure access module – SAM in further text.
NFC Crypto Card – NFC Card that has Private Key Infrastructure in further PKI. A card is used to store digitally signed transactions. 
NFC Mobile Phones with secure elements – Mobile phones that have security elements that can support PKI can be clients as well
Users use cards or mobile phones with stored private keys and certificates that UNICEF provides. Every transaction is digitally signed in NFC Card or Security Element on a Mobile phone.
Terminals have SAM modules with PKI infrastructure. The private key is generated and stored in the terminal and UNICEF provides its certificate and publishes it online.
When we pay, we digitally sign the transaction. Terminals check this transaction and verify the chain of trust. Terminal also signs this transaction and makes a digitally signed block as a candidate for blockchain. Depending on the settings, after a specific time, all new blocks are broadcasted to other devices as an updated proposal including the current device’s digital certificate. Other terminals receive this information, check the validity of the certificate, then check the digital signature of blocks, and if it is valid they start broadcasting results. If more than 50% results are correct then all terminals/nodes accept this change and update their blockchain log.

Description of Digital Logic Ltd Technology:

DL Signer Card is a Java NFC card. Digital Logic has developed a Java Applet which is used to digitally sign data with PKI infrastructure and ECDSA Algorithm. Our NFC readers will process data for signing to a card. The card will digitally sign this data with a private key which is inside the card and return the signature back to the reader. We have developed NFC readers with wireless connections. This kind of reader has the possibility to directly communicate with the server, which allows us to send signed transaction data to our blockchain system. Blockchain system should consist of ECDS digitally signed transaction blocks with SHA2 digest algorithm data at the end. Those blocks of data will be chained. Right now, we have a centralized blockchain to test the basic solution, but we have a plan to develop a consensus operation with peer to peer network.

Technologies that we have today:

As a manufacturer of NFC Readers, we cover the world market. You can inform about our references on page:
https://www.d-logic.com/about-us/references/
Until now we developed:
uFR NFC Reader with wifi support: https://www.d-logic.com/nfc-rfid-reader-sdk/wireless-nfc-reader-ufr-nano-online/ ,
DL Signer Card 30M48CR: https://www.d-logic.com/dl-signer-card-30m48cr/
Our digital signing SDK: https://www.d-logic.com/nfc-rfid-reader-sdk/software/digital-signing-software-sdk-contactless-readers/
Our digital certificate store:
http://ca.d-logic.com/

We hope you like our project and we are looking forward to changing the world with the UNICEF crypto coin.
Digital Logic team.