Explore the use of Solana Token as an identification verification tool

NFT, as a unique non-fungible token, is very suitable as an identification verification tool. This article will explore the feasibility of using NFT as a registration certificate 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 multiple commonly used program implementations and offers a comprehensive client library and CLI tools to facilitate developer usage.

Solana Playground

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

Create Verification Token

We will create an NFT Token as a verification credential. If the user mints this Token, it will be considered registered in the system.

Create Token

Create a new token using spl-token, and specify it as a non-divisible token through --decimals:

spl-token create-token --decimals 0

This will output the Token's Mint Address, serving as the unique identification of the Token.

Create Token Account

Create a Token Account for the newly created Token:

spl-token create-account <token_mint_address>

Mint Token

You can mint tokens for the Token Account:

spl-token mint <token_mint_address> 1

You can also mint directly for the specified wallet address:

spl-token mint <token_mint_address> 1 <wallet_address>

mint for wallet address

To mint for other wallet addresses, you need to create a Token Account for that address first:

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

Then use the created Token Account to mint:

spl-token mint <token_mint_address> 1 <token_account_address>

Query Token Account

You can query whether a wallet address owns a specific Token through the getTokenAccountsByOwner method of the RPC interface:

json { "jsonrpc": "2.0", "id": 1, "method": "getTokenAccountsByOwner", "params": [ "<wallet_address>", { "mint": "<token_mint_address>" }, { "encoding": "jsonParsed" } ] }

Implementation Example

We can create a simple demo project using Nextjs and Ant Design Web3:

1. Initialize Nextjs project
2. Add @ant-design/web3-solana and @solana/spl-token dependencies
3. Create login and registration pages
4. Implement the logic for connecting wallets, querying tokens, and minting tokens.

Login process:

1. User connects wallet
2. Backend query to check if the user's wallet has the verification Token
3. If available, log in successfully; otherwise, prompt the user to register.

Registration process:

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

You can view transaction details on Solscan, verify the creation of the Token Account, and the minting of the Token.

Summary

We created a simple NFT verification system using SPL Token. By checking whether a user's wallet holds a specific Token, we can determine the registration status and mint a verification Token for the user upon registration. This provides a new idea for using blockchain technology for identification.

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