getApproved

The getApproved method, specific to the ERC-721 token standard, facilitates users in querying the Ethereum address (if any) currently authorized to transfer a particular ERC-721 token. In this standard, each non-fungible token (NFT) can only be approved for transfer to one address at a time, apart from its owner, who always retains the privilege to transfer the token. This functionality is integral to the ERC721Instance object, which can be accessed via appropriate methods provided by client libraries, such as ZkyugaClient.

Method Signature

async getApproved(tokenId: string): Promise<string>

Parameters

Parameter	Type	Description
tokenId	string	The unique identifier of the ERC-721 token for which you intend to verify the approved address.

Returns

• A Promise resolving to an Ethereum address string. If no address is authorized, it might return the zero address (0x0000000000000000000000000000000000000000).

Usage Example

First, initialize the desired ERC-721 token contract:

const erc721 = zkyugaClient.getERC721Instance("your ERC-721 contract address here");

Then, utilize the getApproved method with a specific token ID:

const tokenId = "12345"; // Example token ID
const approvedAddress = await erc721.getApproved(tokenId);
if (approvedAddress == "0x0000000000000000000000000000000000000000") {
    console.log(`Token ID ${tokenId} has no approved address.`);
} else {
    console.log(`Token ID ${tokenId} is approved for transfer by: ${approvedAddress}`);
}

Notes

• Keep in mind that even if a token has an approved address, its owner can always transfer it without additional approvals.

• For user interfaces or frontend applications, consider gracefully handling scenarios where the token lacks any approved address (e.g., by providing informative feedback to users).

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