Solana: How to Check if an NFT Belongs to a Specific Collection in Solana with mpl_token_metadata?

Verifying NFT Collection Membership in Solana using mpl_token_metadata

Are you working with Solana and need to verify whether an NFT belongs to a specific collection on the network? In this article, we will explore how to use mpl_token_metadata::state::Metadata to achieve this.

What is mpl_token_metadata::state::Metadata?

mpl_token_metadata::state::Metadata is a data structure that stores information about an NFT’s metadata, including its ownership and collection membership. In Solana, the mpl_token_metadata library provides a way to interact with minted tokens and verify their properties.

Checking if an NFT belongs to a specific collection

To check if an NFT belongs to a specific collection on Solana, you can use the mpl_token_metadata::state::Metadata data structure. Here’s an example of how to do this:

use mpl_token_metadata::{TokenId, TokenMetadata};




fn main() {


    // Create a token metadata instance


    let metadata = TokenMetadata::from_id_and_owner("some-token-id", "some-token-owner");




    // Get the current block timestamp (this is used for pagination)


    let now = BlockNumber::zero();




    // Check if the token belongs to the "some-collection" collection


    match metadata.state().collection() {


        Some(collection) => println!("Token belongs to collection: {}", collection),


        None => println!("Token does not belong to a specific collection"),


    }


}

Using mpl_token_metadata::state::Metadata with spl-merkle-v2

One of the features of Solana’s spl-merkle-v2 consensus algorithm is that it uses a Merkle-based proof system to verify the ownership and collection membership of NFTs. To use spl-merkle-v2, you need to create a SplV2Proof instance, which contains a merkle root and other necessary metadata.

Here’s an example of how to use mpl_token_metadata::state::Metadata with spl-merkle-v2:

use mpl_token_metadata::{TokenId, TokenMetadata, SplV2Proof};


use spl_merkle_v2::SplV2ProofState;




fn main() {


    // Create a token metadata instance


    let metadata = TokenMetadata::from_id_and_owner("some-token-id", "some-token-owner");




    // Get the current block timestamp (this is used for pagination)


    let now = BlockNumber::zero();




    // Check if the token belongs to the "some-collection" collection using spl-merkle-v2


    match metadata.state().spl_2_proof_state() {


        Some(proof) => {


            println!("Token belongs to collection: {}", proof.collection());


        }


        None => println!("Token does not belong to a specific collection"),


    }


}

Example Use Case

Solana: How to Check if an NFT Belongs to a Specific Collection in Solana with mpl_token_metadata?

Suppose you have an NFT with the following metadata:

{


  "id": "some-token-id",


  "owner": "some-token-owner",


  "collection_id": "some-collection-id"


}

To verify whether this token belongs to the “some-collection” collection, you can use the mpl_token_metadata::state::Metadata data structure:

use mpl_token_metadata::{TokenId, TokenMetadata};




fn main() {


    // Create a token metadata instance


    let metadata = TokenMetadata::from_id_and_owner("some-token-id", "some-token-owner");




    // Get the current block timestamp (this is used for pagination)


    let now = BlockNumber::zero();




    match metadata.state().collection() {


        Some(collection) => println!("Token belongs to collection: {}", collection),


        None => println!("Token does not belong to a specific collection"),


    }


}

By using mpl_token_metadata::state::Metadata with spl-merkle-v2, you can efficiently verify whether an NFT’s mint address belongs to a specific collection on Solana.

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