Exploring the Use of Solana Token as an identification verification Tool

NFT (Non-Fungible Token) as a unique digital asset 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.

Tool Introduction

SPL Token

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

Solana Playground

Solana Playground provides an online environment for writing and deploying Solana contracts, which by default includes some commonly used tools, such as SPL Token. We can easily create and manage Tokens using spl-token-cli.

Create verification Token

We will create an NFT Token, and users will be considered registered in the system upon minting this Token.

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, serving as the unique identifier for the Token we created.

Create Token Account

Create a Token Account for the recently 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

Since we set decimals to 0, the actual minted amount is always an integer.

Mint Token for User Wallet

To mint a Token for a user's wallet address, you first need to create a Token Account for that address and then use that Account to mint the Token.

Create Token Account:

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

Query Token Account

Check if the wallet address has minted our NFT through the RPC interface:

curl <rpc_provider_url> -X POST -H "Content-Type: application/json" -d '{ "jsonrpc": "2.0", "id": 1, "method": "getTokenAccountsByOwner", "params": [ "<wallet_address>", { "mint": "<token_mint_address>" }, { "encoding": "jsonParsed" } ] }'

Implementing a Login System

Create a simple login system using Next.js and Ant Design Web3:

1. Initialize Next.js project
2. Add relevant dependencies
3. Create login and registration pages

Login process:

• User connects wallet
• Check the backend to see if there is an associated Token Account
• Allow login if it exists; otherwise, prompt the user to register.

Registration Process:

• User connects wallet
• The backend creates a Token Account and mints the Token
• Registration successful

Summary

We have implemented a Solana-based identification verification system by creating NFTs and using them as user registration credentials. When users first connect their wallets, the system automatically creates a Token Account and mints a Token as a registration credential. Afterwards, users can log in to the website using the same wallet address. This method provides a new way of authentication for Web3 applications, fully leveraging the characteristics of blockchain technology.

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