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Check how to emboss 1B+ NFT images on the fly from iOS
Suddenly everyone replaces their profile pictures with computer-generated pixel figures. Everyone from cryptocurrency enthusiasts to real life celebrities seems to have jumped on this trend. These collections of pixel art are commonly known as NFTs, or Non-Fungible Tokens. And in this article, we will talk about NFTs in detail. Above all, we want to answer the question “What is an NFT?”. And how to create your own and put them up for sale.
So let’s start at the beginning. An NFT, short for non-fungible token, is a portion of a digital asset stored on the Ethereum blockchain. Non-fungible simply means that each token is unique and cannot be replicated. When you or someone else creates an NFT, you are automatically assigned a token for your custom asset. And only with this token can you prove that you are the owner of the respective piece.
The tokens are stored entirely on the blockchain and are visible to everyone. This helps create a strong sense of ownership, which can then be validated by those interacting with your digital assets. The NFT application is simple enough to understand. But its usability in real scenarios is much broader than just a crypto asset. Below are instructions for creating 1B+ NFT images from an iOS device
How to mint 1B+ NFT images on the go from iOS
pictures
We have 6 collections. Within the collections we have 6-8 levels. Each level contains 10 to 50 separate images. If we do the math, the number of variations easily exceeds a billion.
Since minting an NFT is not free, we decided not to pre-mint all NFTs, but to mint them individually (on the fly). Whenever the user desires an NFT, the process starts over.
process payment
Since we are talking about NFT and blockchain, it is obvious that payment must be made with cryptocurrencies (like Bitcoin, Ethereum, etc.). But good luck convincing Apple to allow users to pay with crypto within an iOS app.
Due to strict Apple rules, we have to let Apple handle user payments. In this case, this means an in-app purchase. So we get the payments from Apple (in USD) and at some point we have to use our own cryptocurrency to pay the transaction fees for the NFT coins (and the smart contract).
smart contract
A “smart contract” is simply a program running on the Ethereum blockchain. It is a collection of code (its functions) and data (its state) that resides at a specific address on the Ethereum blockchain. There are two types of accounts on the Ethereum blockchain:
- Externally owned accounts (the ones you have in MetaMask or any wallet). You can control this type of account with the private key.
- contract accounts. This type is controlled by code.
So the NFTs you have in your wallets are tied to a contract that lives on the blockchain. For example, CryptoPunks contract address is 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB. But how do we “create” a smart contract? The contract itself is coded in the Solidity programming language and then implemented on the Ethereum blockchain.
Decentralized file storage
First we need to upload the image to IPFS. The Interplanetary File System (IPFS) is a peer-to-peer network and protocol for storing and sharing data in a distributed file system. We will use piñata for this task. Pinata is an easy-to-use paid API that lets you interact with IPFS without running your own node.
Final words: How to emboss 1B+ NFT images on the fly from iOS
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