ERC-721 is a Non-fungible Token standard
According to the previous passage, The opposite of ERC-20’s key feature is fungibility.
On Ethereum, ERC-721 is the standard protocol used to create NFTs.
If ERC-20 tokens are like identical coins, then ERC-721 tokens are like a collection of unique artworks.
Now, let's explore its main features:
1. NFT’s core feature is uniqueness：
Every ERC-721 token has a unique ID, so two NFTs can not be interchangeable.
That means your NFT and mine are completely distinct assets.
2. NFT's core utility is proof of ownership：
For instance，a digital artwork、a collection，or even a digital ticket can be linked to an NFT。
Holding an NFT is equivalent to owning an ownership certificate.
3. The core data of an NFT (Metadata)
Every NFT may include Metadata, such as image, description, attributes.
This metadata defines what the NFT represents and makes it a unique asset.
However, it's important to pay attention to where the NFT's image is stored.
In most cases, the image associated with the NFT is not store on-chain.
Instead, the NFT only stores a reference URL pointing to an off-chain resource.Therefore, before purchasing an NFT, you'd better check the metadata storage method to ensure your assets security.
You can use tools like Etherscan to inspect the smart contract and view the actual metadata.
Conclusion
ERC-721 is the NFT standard protocol.
It gives every digital asset a unique identity and verifiable proof of ownership.
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