Get all NFT tokens in a wallet

gemmy · March 13, 2024, 8:49am

After minting multiple tokens using the CIS2 Contract, I want to display all the tokens from the wallet without specifying a tokenId, that means, If a wallet has 5 tokens from a contract, I want to display them all.

I would prefer a JavaScript Solution.

Doris · March 13, 2024, 9:28am

If you want your solution to work for any CIS2Contract deployed, then writing an indexer that listens to the following events to build a database of who owns which token of a specific cis2contract would work. Your backend would construct/maintain such a database and your front end would query the tokens own by a specific account address via an endpoint that your backend exposes.

Cis2Event::Mint , Cis2Event::Transfer, and Cis2Event::Burn events

github.com

Concordium/concordium-rust-smart-contracts/blob/main/examples/cis2-nft/src/lib.rs#L380


      
          // Parse the parameter.
          let params: MintParams = ctx.parameter_cursor().get()?;
          
          let (state, builder) = host.state_and_builder();
          
          for &token_id in params.tokens.iter() {
              // Mint the token in the state.
              state.mint(token_id, &params.owner, builder)?;
          
              // Event for minted NFT.
              logger.log(&Cis2Event::Mint(MintEvent {
                  token_id,
                  amount: ContractTokenAmount::from(1),
                  owner: params.owner,
              }))?;
          
              // Metadata URL for the NFT.
              logger.log(&Cis2Event::TokenMetadata::<_, ContractTokenAmount>(TokenMetadataEvent {
                  token_id,
                  metadata_url: MetadataUrl {
                      url:  build_token_metadata_url(&token_id),

Here are some (not advised/production ready) solutions, but might work if you just want to hack around:

Some CIS2 contracts expose view functions that you can query (assuming the number of NFTs in the contract are small enough).
concordium-rust-smart-contracts/examples/cis2-nft/src/lib.rs at main · Concordium/concordium-rust-smart-contracts · GitHub
The walletProxy has an API endpoints that you can query:
GET /v0/CIS2TokenBalance/{index}/{subindex}/{account address}
GitHub - Concordium/concordium-wallet-proxy
e.g. If you open the URL in the browser https://wallet-proxy.testnet.concordium.com/v0/CIS2Tokens/6607/0 you get all tokens from that contract.
Querying the balance of one tokenId:
e.g. https://wallet-proxy.testnet.concordium.com/v0/CIS2TokenBalance/6607/0/4bbdAUCDK2D6cUvUeprGr4FaSaHXKuYmYVjyCa4bXSCu3NUXzA?tokenId=ee0400a9d5d07500
Querying the balance of several tokenIds:
e.g. https://wallet-proxy.testnet.concordium.com/v0/CIS2TokenBalance/6607/0/4bbdAUCDK2D6cUvUeprGr4FaSaHXKuYmYVjyCa4bXSCu3NUXzA?tokenId=ee0400a9d5d07500%2C620500a5b0107a00