tw7613781 / nft-study

NFT study

Concept

ERC20 vs ERC721

"lumped together" as a nuber in a ledger => assets have its ownership individually and atomically tracked

How to store

every NFT stores as a unit256 ID in a ERC-721 compatible smart contract, the pair (contract address, uint256 tokenID) is globally unique in the chain.

How to transfer ownership

transferFrom

• The owner of an NFT

• An approved address of an NFT

• An authorized operator of the current owner of an NFT

Architecture

How to run the code

Smart contract

npm run migrate

Currently the target Ethereum blockchain is ropsten chain, you can change it in truffle-config.js. After configured your own mnemonic words in .secret file, you can run the above command to deploy the smart contract to the target chain and intial a NFT creation with ID 0.

The smart contract at ropsten network: https://ropsten.etherscan.io/address/0xa48E498D467cef99ca714700506f4Eeb3B34f50C

The smart contract will return the NFT uri to any request with specific ID.

Backend

npm run start

The server is a HTTP API server to serve the details meta data and the binary file.

Frontend

npm run dev

The client connects to Etherem network with metamask and download the nft meta data, binary file, finaly display it.