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🚀 How to Implement an Advanced Solana SPL Token with Custom Logic?

I am developing a custom SPL token on Solana using the Anchor framework. I want to introduce custom minting logic, role-based access control, and a burn mechanism with special conditions. Here's my advanced Solana token program:

📜 Rust (Anchor) Smart Contract

use anchor_lang::prelude::*;
use anchor_spl::token::{self, Mint, Token, TokenAccount, Transfer, Burn};

declare_id!("YOUR_PROGRAM_ID_HERE");

#[program]
pub mod advanced_spl_token {
    use super::*;

    // Mint new tokens but only if the caller is an admin
    pub fn mint(ctx: Context<MintToken>, amount: u64) -> Result<()> {
        let mint = &ctx.accounts.mint;
        let authority = &ctx.accounts.authority;

        require!(authority.key() == mint.mint_authority.unwrap(), CustomError::Unauthorized);

        let cpi_accounts = token::MintTo {
            mint: ctx.accounts.mint.to_account_info(),
            to: ctx.accounts.recipient.to_account_info(),
            authority: ctx.accounts.authority.to_account_info(),
        };

        let cpi_ctx = CpiContext::new(ctx.accounts.token_program.to_account_info(), cpi_accounts);
        token::mint_to(cpi_ctx, amount)?;

        Ok(())
    }

    // Custom burn function that requires user to hold a minimum balance after burning
    pub fn burn(ctx: Context<BurnToken>, amount: u64) -> Result<()> {
        let account = &ctx.accounts.user_token_account;
        let user_balance = account.amount;

        require!(user_balance - amount >= 100 * 10u64.pow(6), CustomError::MinimumBalanceRequired);

        let cpi_accounts = Burn {
            mint: ctx.accounts.mint.to_account_info(),
            from: ctx.accounts.user_token_account.to_account_info(),
            authority: ctx.accounts.user.to_account_info(),
        };

        let cpi_ctx = CpiContext::new(ctx.accounts.token_program.to_account_info(), cpi_accounts);
        token::burn(cpi_ctx, amount)?;

        Ok(())
    }
}

#[derive(Accounts)]
pub struct MintToken<'info> {
    #[account(mut)]
    pub mint: Account<'info, Mint>,
    #[account(mut)]
    pub recipient: Account<'info, TokenAccount>,
    #[account(signer)]
    pub authority: Signer<'info>,
    pub token_program: Program<'info, Token>,
}

#[derive(Accounts)]
pub struct BurnToken<'info> {
    #[account(mut)]
    pub user_token_account: Account<'info, TokenAccount>,
    #[account(mut)]
    pub mint: Account<'info, Mint>,
    #[account(signer)]
    pub user: Signer<'info>,
    pub token_program: Program<'info, Token>,
}

#[error_code]
pub enum CustomError {
    #[msg("You are not authorized to mint tokens.")]
    Unauthorized,
    #[msg("You must hold a minimum balance after burning tokens.")]
    MinimumBalanceRequired,
}

❓ Questions:

  1. Security: How can I make this contract more secure? Should I implement multi-signature approvals for minting?
  2. Governance: Should I integrate a DAO structure to control minting/burning instead of a fixed admin?
  3. Gas Optimization: Is there a way to optimize transaction costs for minting and burning?
  4. Cross-Program Invocation (CPI): How can I integrate this with other Solana programs for additional functionality?
  5. Testing: What are the best tools to test and simulate this contract before deploying?

Looking forward to expert insights from Solana developers! 🔥⚡

🔹 Features of This Smart Contract:

  • Custom mint function restricted to an admin.
  • Custom burn function that ensures users maintain a minimum token balance after burning.
  • Role-based access control using mint_authority.
  • Error handling with Anchor's #[error_code].
  • Secure token interactions using Solana's SPL Token Program.