Exploring the Use of Solana Token as a Verification Tool

NFT ( non-fungible token ) is an "irreplaceable" token, making it very suitable as an identification verification tool. This article will explore the feasibility of using NFT as a registration credential through a simple example.

Tool Introduction

SPL Token

Solana provides the Token Program as a generic implementation, which is part of the Solana Program Library (SPL). SPL includes several commonly used program implementations, such as Token, Swap, Memo, etc., and provides a complete client library and CLI tools, greatly facilitating developers.

Solana Playground

Solpy provides an online environment for writing and deploying Solana contracts, which includes some commonly used tools by default, such as SPL Token. We can easily create and manage tokens using 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 is registered in the system; otherwise, prompt the user to register first.

Create Token

Create a new indivisible token using spl-token:

spl-token create-token --decimals 0

This will output the Mint Address, which is the ID of the created Token.

Create Token Account

Create a Token Account for the newly 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

You can also try minting other values, such as 1.9, but since we specified decimals as 0, the decimal part will be truncated during the actual execution.

is the wallet address Mint

To mint tokens for the user's wallet address, you need to first create a Token Account for that address:

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

Then use the created Token Account to perform the mint operation.

Get Token Account

The getTokenAccountsByOwner method through the RPC interface can be used to check whether a certain wallet address has minted the NFT we created.

Implement Login System

Based on the above operation, we can implement a simple login system. The main steps are as follows:

1. Create a Nextjs project
2. Use Ant Design Web3 to connect the wallet
3. Implement sign-in and sign-on pages
4. Check if the user is registered (if they have minted an NFT) during sign-in.
5. Mint an NFT for the user as a registration certificate during sign-on.

Users need to register first (mint NFT) when using for the first time, and then they can log in directly with the same wallet address.

Summary

We have implemented a blockchain-based identification verification system by creating NFTs and using them as user registration credentials. This approach leverages the non-fungibility of NFTs, providing a new way to manage users for Web3 applications.

<wallet_address><token_mint_address><token_mint_address><token_mint_address>