What the heck is an NFT?
Before we get into it, let's go over what an NFT is. NFT stands for Non-Fungible Token. The word fungible means "able to be replaced" or "replace an identical item". In short, a Non-Fungible token is irreplaceable. For a digital asset to be irreplaceable, it needs to be unique. So the tokens we will be creating are unique and irreplaceable! Some use cases for these unique tokens ensure the authenticity of information. As of right now, the main usages of NFTs have been for digital art and collectibles but they can be used for so much more. For example, one could use NFTs to protect information like a deed to a house, certificates of authenticity, educational degrees, identity cards, or other crucial unique details.
How do you make one?
Environment Set up
You are free to use any of your preferred environment tools. I recommend following this short (3min) guide to set up with node.
After configuring your account Id, private keys, and the client. your code should look something like this
Creating the NFT
To create the NFT, you will need to import TokenCreateTransaction, PrivateKey, TokenType, and TokenSupplyType from the Hedera SDK, so include these in the require statement at the top of your file. Then you can use the TokenCreateTransaction passing in the appropriate configuration for your token. For reference, take a look at the example below.
Here we create a token with a supply of 10. The initial collection must be zero so that you can set unique metadata for each NFT. It is also crucial that the decimals are zero so that your NFTs wont be fractional. The supply key is the key of the account permitted to mint the corresponding NFTs. We will go over minting in the next section.
Minting an NFT is straightforward. We use the TokenMintTransaction from the Hedera SDK, so be sure to include it in your imports at the top of your file. The syntax is provided below.
There are multiple options for metadata storage solutions. I wrote more in-depth about the possibilities and use cases here. However, it is very straightforward and typical for developers to use the InterPlanetary File System (IPFS).
Querying NFT Information
Now that your NFT has been minted, you might want to be able to access its metadata from the network. To do this, you can use the TokenNftInfoQuery, and NftId from the Hedera SDK.
This query returns the metadata of the minted NFT.
If you liked this guide or have questions I will be going through some of these examples live on twitch so be sure to follow HederaTV on twitch.
Top comments (21)
First of all, thank you very much for the interesting post, but since I see this here a lot, I asked myself how you do that with the code excerpt so that it looks like it is in a computer window ... Is there a website or something ?
Yeah absolutely, it's an application called carbon. Handy for making pretty code.
Just a point, code shown using Carbon it isn't very accessible for those with screen readers. It's preferred to use the inbuilt syntax highlighting to be inclusive.
Interesting, good point. I know a lot of people use it to prevent copy-pasters and encourage people to really get into the concepts and explore the syntax themselves.
Hi Waylon. Seems like there's a ton of networks out there to choose from - why did you choose Hedera/Hashgraph? What's the sweet spot of it? Has it a huge community? How does it compare to e.g. Polkadot?
Great question! It can be overwhelming with all the networks out there. Hedera is currently the most utilized DLT, processing more transactions than Ethereum and BTC in under two years. Additionally, its predictably low fees and high throughput allow for scalability that few networks can match. A recent report by the London School of Economics showed that Hedera uses less energy than any of the other DLTs. There are so many amazing things about Hedera, but I encourage you to do some of your own research and go down the rabbit hole :). Full disclaimer: I am employed by Hedera so I have an inherent bias, I chose to work for them because of some of the details listed above. If you do have any questions about using the SDKs, please feel free to reach out.
Take a look at the capabilities Hedera
Regarding the community, there is a very active developer community, if you are curious i recommend checking out the developer discord
Also I found a community member who made some info graphics on some comparison metrics
These numbers are really impressive.
I thought so too :)
So glad you did this article
Im getting the following though?
TypeError: Cannot read property 'NonFungibleUnique' of undefined
Hmm it could be a few different things. Be sure to import TokenType from hedera sdk at the top. What version of the SDK are you using?
Before we get into MINTING NFT, it's good to know the theory. If you are looking for a good post on this topic, I recommend this post: nftmonk.com/what-is-minting-nft-a-...
Is there a way to allow a list of allowed accountIds to mint on a token? Rather than limited to a single accout? Just like in ethereum anyone can mint the token?
Hey good question, currently there is support for a threshold key, with allows to be configured for a list of keys to all be valid signatures. I have been talking internally with support to leave the supply key empty (allowing anyone to mint as long as supply is below max supply).
Hi, your IPFS link should go to IPFS.io, not .com.
Thanks for the article, I plan on trying this.
Thanks for the tip! Let me know how it goes!