Nature of NFTs

What is ERC-721?

"Ethereum Request for Comments (ERC) 721 is a data standard for creating non fungible tokens, meaning each token is unique and cannot be divided or directly exchanged for another ERC-721 token.

The ERC-721 standard allows creators to issue unique crypto assets like NFTs via smart contracts."

Source: Coinbase

"ERC-721 tokens differ to ERC-20 tokens in the sense that ERC-721 tokens are non-fungible. This means that each token is unique and as a result, not interchangeable. 

Breaking down ERC

ERC stands for Ethereum Request for Comments. This isn’t a technology or platform, it provides technical guidance to developers for construction. As of December 2018, there are nine final Ethereum Requests for Comments. ERC-20, ERC-55, ERC-137, ERC-162, ERC-165, ERC-181, ERC-190, ERC-721, and ERC-1167.

Developers can create an ERC by submitting an Ethereum Improvement Proposal (EIP).

A popular Ethereum decentralized application, Cryptokitties, utilized ERC-721 to create unique digital collectibles in the form of kitties.
Each different kitten was worth a different amount on the marketplace, dictated by the users of the platform. Each different kitten commands a different price, and as a result, each token needs to be unique. 

The creation of blockchain based non-fungible tokens allows for 

  • physical property (houses, artwork, and vehicles)
  • Virtual Collectibles (Cryptokitties, rare pepes, collectible cards)
  • Assets with negative value (loans)

In order to create an ERC-721 token, the contract must be compliant with both the ERC-721 and ERC-165 interfaces."

Source: Binance Academy