title: how to verification address in solidity
body: <p>Through web3 transactions, the private key is used to sign the initiated transaction to verify the transaction information and prove the owner of the address.</p>
  <p>But in the transfer method in the smart contract erc721, I did not see the code related to the signature</p>
  <p>Does this mean that as long as I have the address I can make the transaction directly without the need for the private key to sign</p>