August 2019
Intermediate to advanced
486 pages
13h 52m
English
Content preview from Mastering Blockchain Programming with Solidity
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The Transfer event
The Transfer event is triggered when an NFT is transferred from the current owner's account to the receiver's account.
The event takes three arguments:
- from: The address from where the token is transferred
- to: The address of the receiver of the token
- tokenId: The tokenId of the NFT that is transferred
All of the preceding arguments are indexed in the event, which would allow the client applications to filter out the events:
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
The event is also triggered when the new NFT is minted, or an existing NFT is burned from the contract. When a new NFT is minted, the from address will be address(0). However, when an existing NFT is burned, the to