what is difference between transfer event of Mint function and Transfer function of ERC20 Smart Contract?

Question

what is difference between transfer event of Mint function and Transfer function of ERC20 Smart Contract ?

I know that in Transfer event of Mint a from address is address(0) while in Transfer there is address of sender but not zero. I am expecting a different approach.

Answer 1

The Transfer event accepts 3 params: token sender, recipient, and amount.

A token contract which creates new tokens SHOULD trigger a Transfer event with the _from address set to 0x0 when tokens are created.

Source: https://eips.ethereum.org/EIPS/eip-20

This is the standardized approach to emitting events when minting tokens.

You can also emit custom events on top of that. For example:

event Transfer(address indexed from, address indexed to, uint256 amount);
event Mint(uint256 amount, uint256 timestamp);

function mint(uint256 amount) external onlyOwner {
     balanceOf[msg.sender] += amount;
     totalSupply += amount;
     emit Transfer(address(0x0), msg.sender, amount);
     emit Mint(amount, block.timestamp);
}