Explore Using Solana Token for Identification Verification

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 start, we need to understand the following tools:

SPL Token

The Token Program provided by Solana is part of the Solana Program Library (SPL). SPL includes multiple commonly used program implementations and provides a comprehensive client library and CLI tools, greatly facilitating development.

Solana Playground

This is an online environment for writing and deploying Solana contracts, equipped with some commonly used tools, including the SPL Token mentioned above. We can easily create and manage tokens through spl-token-cli.

Create Identification Verification Token

We will create an NFT Token. If a user mints the Token, it is considered that the wallet address has been registered in the system.

Create Token

Create a new indivisible Token using spl-token:

spl-token create-token --decimals 0

This will output the Mint Address of the Token, which is the unique identification of the Token.

Create Token Account

Create a Token Account for the created Token:

spl-token create-account <token_mint_address>

Mint Token

Try to mint a Token unit for the Token Account:

spl-token mint <token_mint_address> 1

mint for wallet address

To mint tokens for a user wallet, you first need to create a Token Account for that wallet, and then use that Account to mint.

Create Token Account:

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

Get Token Account Information

Use the getTokenAccountsByOwner method of the RPC interface to check if the wallet has minted NFTs.

Implementation

We create a simple project using Nextjs and connect the wallet using Ant Design Web3.

Mainly implemented three pages:

• Home: Welcome message and link to the login page
• Login page: Connect wallet and check if the user is registered
• Registration Page: Allow users to register ( to mint NFT )

Login process:

1. User connects wallet
2. The backend checks whether the wallet has the corresponding Token Account.
3. If yes, login successful; otherwise prompt the user to register first.

Registration process:

1. User connects wallet
2. The backend creates a Token Account for the wallet and mints an NFT.
3. Registration Successful

After completing registration, you can view the relevant transaction records and minted NFTs on Solscan.

Summary

We have implemented a simple identification verification system by creating NFTs and using them as user registration credentials. Users only need to connect the same wallet to log in to the website again. This method leverages the immutable nature of blockchain, providing a new approach to identification verification for Web3 applications.

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