创建一个 Token Mint
如何使用 Confidential Transfer 扩展创建一个 mint
Confidential Transfer 扩展通过向 mint account 添加额外的状态,支持私密的 token 转账。本节将解释如何启用此扩展来创建一个 token mint。
下图展示了使用 Confidential Transfer 扩展创建一个 mint 的步骤:
Confidential Transfer Mint 状态
该扩展向 mint account 添加了 ConfidentialTransferMint 状态:
#[repr(C)]#[derive(Clone, Copy, Debug, Default, PartialEq, Pod, Zeroable)]pub struct ConfidentialTransferMint {/// Authority to modify the `ConfidentialTransferMint` configuration and to/// approve new accounts (if `auto_approve_new_accounts` is true)////// The legacy Token Multisig account is not supported as the authoritypub authority: OptionalNonZeroPubkey,/// Indicate if newly configured accounts must be approved by the/// `authority` before they may be used by the user.////// * If `true`, no approval is required and new accounts may be used/// immediately/// * If `false`, the authority must approve newly configured accounts (see/// `ConfidentialTransferInstruction::ConfigureAccount`)pub auto_approve_new_accounts: PodBool,/// Authority to decode any transfer amount in a confidential transfer.pub auditor_elgamal_pubkey: OptionalNonZeroElGamalPubkey,}
ConfidentialTransferMint
包含三个配置字段:
-
authority:有权限更改 mint 的 Confidential Transfer 设置并在禁用自动审批时批准新的 confidential accounts 的账户。
-
auto_approve_new_accounts:当设置为 true 时,用户可以默认启用 Confidential Transfer 创建 token accounts。当设置为 false 时,authority 必须批准每个新的 token account 后才能用于 Confidential Transfer。
-
auditor_elgamal_pubkey:一个可选的审计员,可以解密 Confidential Transfer 交易中的转账金额,提供合规机制,同时保持对公众的隐私。
必需的指令
启用 Confidential Transfer 的 mint 创建需要在单个交易中包含三个指令:
-
创建 Mint Account:调用 System Program 的
CreateAccount
指令来创建 mint account。 -
初始化 Confidential Transfer 扩展:调用 Token Extension Program 的 ConfidentialTransferInstruction::InitializeMint 指令来配置 mint 的
ConfidentialTransferMint
状态。 -
初始化 Mint:调用 Token Extension Program 的
Instruction::InitializeMint
指令来初始化标准的 mint 状态。
虽然您可以手动编写这些指令,但 spl_token_client
crate 提供了一个 create_mint
方法,可以在单个函数调用中构建并发送包含所有三个指令的交易,如以下示例所示。
示例代码
以下代码演示了如何使用机密转账扩展创建一个 mint。
要运行此示例,请使用以下命令启动一个从主网克隆的包含 Token Extension Program 的本地 validator。您必须安装 Solana CLI 才能启动本地 validator。
$solana-test-validator --clone-upgradeable-program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb --url https://api.mainnet-beta.solana.com -r
在撰写本文时,机密转账功能尚未在默认的本地 validator 上启用。您必须克隆主网的 Token Extension Program 才能运行示例代码。
use anyhow::{Context, Result};use solana_client::nonblocking::rpc_client::RpcClient;use solana_sdk::{commitment_config::CommitmentConfig,signature::{Keypair, Signer},};use spl_token_client::{client::{ProgramRpcClient, ProgramRpcClientSendTransaction},spl_token_2022::id as token_2022_program_id,token::{ExtensionInitializationParams, Token},};use std::sync::Arc;#[tokio::main]async fn main() -> Result<()> {// Create connection to local test validatorlet rpc_client = RpcClient::new_with_commitment(String::from("http://localhost:8899"),CommitmentConfig::confirmed(),);// Load the default Solana CLI keypair to use as the fee payer// This will be the wallet paying for the transaction fees// Use Arc to prevent multiple clones of the keypairlet payer = Arc::new(load_keypair()?);println!("Using payer: {}", payer.pubkey());// Generate a new keypair to use as the address of the token mintlet mint = Keypair::new();println!("Mint keypair generated: {}", mint.pubkey());// Set up program client for Token clientlet program_client =ProgramRpcClient::new(Arc::new(rpc_client), ProgramRpcClientSendTransaction);// Number of decimals for the mintlet decimals = 9;// Create a token client for the Token-2022 program// This provides high-level methods for token operationslet token = Token::new(Arc::new(program_client),&token_2022_program_id(), // Use the Token-2022 program (newer version with extensions)&mint.pubkey(), // Address of the new token mintSome(decimals), // Number of decimal placespayer.clone(), // Fee payer for transactions (cloning Arc, not keypair));// Create extension initialization parameters// The ConfidentialTransferMint extension enables confidential (private) transfers of tokenslet extension_initialization_params =vec![ExtensionInitializationParams::ConfidentialTransferMint {authority: Some(payer.pubkey()), // Authority that can modify confidential transfer settingsauto_approve_new_accounts: true, // Automatically approve new confidential accountsauditor_elgamal_pubkey: None, // Optional auditor ElGamal public key}];// Create and initialize the mint with the ConfidentialTransferMint extension// This sends a transaction to create the new token mintlet transaction_signature = token.create_mint(&payer.pubkey(), // Mint authority - can mint new tokensSome(&payer.pubkey()), // Freeze authority - can freeze token accountsextension_initialization_params, // Add the ConfidentialTransferMint extension&[&mint], // Mint keypair needed as signer).await?;// Print results for user verificationprintln!("Mint Address: {}", mint.pubkey());println!("Transaction Signature: {}", transaction_signature);Ok(())}// Load the keypair from the default Solana CLI keypair path (~/.config/solana/id.json)// This enables using the same wallet as the Solana CLI toolsfn load_keypair() -> Result<Keypair> {// Get the default keypair pathlet keypair_path = dirs::home_dir().context("Could not find home directory")?.join(".config/solana/id.json");// Read the keypair file directly into bytes using serde_json// The keypair file is a JSON array of byteslet file = std::fs::File::open(&keypair_path)?;let keypair_bytes: Vec<u8> = serde_json::from_reader(file)?;// Create keypair from the loaded bytes// This converts the byte array into a keypairlet keypair = Keypair::from_bytes(&keypair_bytes)?;Ok(keypair)}
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