Creation of a gamified NFT collection

The main feature of the collection – NFT owners can upgrade their Dragons from level 1st to 7th. Upgrades are directly related to a user transactions in Ethereum network: the more transactions have been made, the more experience users gains, which he can spend to improve owned Dragon. This feature gives additional interest to the project, and besides, it is a really clear and, most importantly, transparent mechanics.

To define random NFT layers, our team used the Chainlink VRF blockchain service: with its help, we get randomized parameters inside the blockchain. After generating them, the layer data is directly written into the smart contract of the collection. As a result, this numerical combination serves as an identification file in a folder on IPFS. Subsequently, no one can change the NFT layers - everything is done in the best tradition of decentralized applications.

For level up of a Dragon, the smart collection contract must receive data about ETH spent by users on commissions in Ethereum network.

We created an architecture in which a smart contract accesses the project backend via Chainlink, which in turn communicates with Etherscan blockchain-explorer. After receiving the user transaction data and conducting necessary calculations, the server application generates and uploads a new image with NFT metadata to IPFS. It is the data that will be displayed to the user when querying the collection smart contract.