Exploring the use of Solana Token as an identification verification tool

NFT, as a non-fungible token, is very suitable for use as an identification verification tool. This article will explore the feasibility of using NFT as a registration credential through a simple example.

Preparation Work

Before we begin, let's introduce the tools we will be using.

SPL Token

We can directly use the general implementation of the Token Program provided by Solana, without having to write a new Solana contract from scratch. The Token Program is part of the Solana Program Library (SPL), providing multiple common program implementations including Token, Swap, and Memo, along with a complete set of client libraries and CLI tools, which greatly facilitates Solana developers.

Solana Playground

Solpy provides an online environment for writing and deploying Solana contracts, which comes pre-equipped with some common tools, such as the SPL Token mentioned above. We can easily create and manage tokens using spl-token-cli.

Create Verification Token

In this section, we will create an NFT Token. If the user mints the Token, it is considered that this wallet address is registered in the system; otherwise, prompt the user to register first.

Create Token

Create a new token using spl-token and specify it as a non-divisible token with the --decimals parameter:

spl-token create-token --decimals 0

This will output a Mint Address, which serves as the ID of the Token we created.

Create Token Account

Create a Token Account for the Token created in the previous step:

spl-token create-account <token_address>

Mint Token

Try to mint a Token unit for the created Token Account:

spl-token mint <token_address> 1

is the wallet address Mint

To mint for other wallet addresses, you need to first create a Token Account for that address, and then use the created Token Account to mint new Token units.

Create Token Account:

spl-token create-account <token_address> --owner <wallet_address>

Get Token Account

Use the getTokenAccountsByOwner method of the RPC interface to check whether the wallet address has minted the NFT we created.

Implementation

Based on the above attempts, we can start writing the client code. Below is a simple example implemented using Nextjs and Ant Design Web3.

1. Initialize Nextjs project

2. Add relevant dependencies

3. Create login and registration pages

4. Implement the logic for connecting the wallet and checking the user's registration status.

5. Implement the registration process (mint NFT)

Summary

We used spl-token-cli to create an NFT and determined whether the user is registered by checking if the wallet address has a Token Account and has minted a Token.

When Web3 users connect their wallets, the system automatically sends a sign-on request, creates a Token Account in the backend, and mints a Token unit as a user registration credential.

After that, users can log in to the website again using the same wallet address.

This method provides a feasible idea for using NFTs as identification verification tools, which can be further optimized and expanded based on actual needs.

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