不可变所有者扩展

Name: 使用 Web3.js 的 Token2022
Availability: InStock

ImmutableOwner 扩展是一种 Token 账户扩展，它可以防止 Token 账户的所有权发生任何更改。这可以保护账户免受未经授权的访问和转移尝试。

所有 Token 扩展程序的 ATA 默认启用了不可变所有者功能

初始化代币账户

要在 Token 账户上初始化 ImmutableOwner 扩展，我们需要使用 initializeImmutableOwner() 函数。

以下是如何使用不可变所有者扩展创建一个铸币：

import { Keypair, SystemProgram, Transaction, sendAndConfirmTransaction } from "@solana/web3.js";
import {
  createInitializeAccountInstruction,
  createInitializeImmutableOwnerInstruction,
  getAccountLen,
  ExtensionType,
  TOKEN_2022_PROGRAM_ID,
} from "@solana/spl-token";

const tokenAccount = Keypair.generate();

// Calculate the size needed for a Token account with Transfer Fee extension
const accountLen = getAccountLen([ExtensionType.ImmutableOwner]);

// Calculate minimum lamports required for rent exemption
const lamports = await connection.getMinimumBalanceForRentExemption(accountLen);

// Create the account with the correct size and owner
const createAccountInstruction = SystemProgram.createAccount({
  fromPubkey: keypair.publicKey,
  newAccountPubkey: tokenAccount.publicKey,
  space: accountLen,
  lamports,
  programId: TOKEN_2022_PROGRAM_ID,
});

// Initialize the Immutable Owner extension
const initializeImmutableOwnerInstruction = createInitializeImmutableOwnerInstruction(
  tokenAccount.publicKey,
  TOKEN_2022_PROGRAM_ID,
);

// Initialize the Token account itself
const initializeAccountInstruction = createInitializeAccountInstruction(
  tokenAccount.publicKey,
  mint.publicKey,
  keypair.publicKey,
  TOKEN_2022_PROGRAM_ID,
);

const transaction = new Transaction().add(
  createAccountInstruction,
  initializeImmutableOwnerInstruction,
  initializeAccountInstruction,
);

const signature = await sendAndConfirmTransaction(
  connection,
  transaction,
  [keypair, tokenAccount],
  { skipPreflight: false },
);

console.log(
  `Token accounts created! Check out your TX here: https://explorer.solana.com/tx/${signature}?cluster=devnet`,
);

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如前所述，如果我们想将此扩展添加到 Associated Token 账户，只需使用 Token2022 程序对其进行初始化即可。