Mastering Blockchain Programming with Solidity

The Transfer event

This event must be triggered when the tokens are transferred from one account to another account. Even if the number of tokens is zero, the event must trigger. When new tokens are created or minted, the event should use 0x0 as the from address.

The Transfer event in the Solidity contract must be defined as follows:

event Transfer(address indexed from, address indexed to, uint256 value);

The event takes the following arguments:

• from: This is the address from which the tokens are sent. This parameter is indexed.
• to: This is the address that receives the tokens. This parameter is indexed.
• value: This is the number of tokens (as uint256) transferred from the from address to the to address.