How EtherScan keep the complete track of NFT(ERC721 token) transaction

Question

My Usecase is to get transaction hash and show from which to which wallet a NFT was transferred. but when i use getTransaction of web3.js it returns me contract address in to field instead of wallet/new owner address

EDIT this is what im doing right now (just for testing purposes)

 console.log(await web3.eth.getTransaction("0x93dfc88f391fc68d8fe8e75e6c37dbb8011a3bf872433909766341953464ee43"))

this is getTransaction responce

this is info given by ether scan

now as you can see in GetTransaction response we get contract address but what i want the to from tokens transferred

Answer 1

One transaction can have an arbitrary number of ERC-721 transactions. Each transaction will emit a Transfer event.

The typical way to do it is:

var contract = new web3.eth.Contract(abi, contractAddress, {from: account});
contract.events.Transfer(
  {filter: {from: account}}, fromBlock: 0},
  function(error, event){ console.log(event); }
)

This can be filtered per block, TX, accounts, etc.