元数据指针与代币元数据

什么是元数据指针和代币元数据扩展？

Token Extensions Program 的 MetadataPointer 铸币扩展在铸币上存储两个字段：

可以更新指针的权限
存储代币元数据的账户地址

该指针可以引用任何实现了 token-metadata 接口的程序所拥有的账户。

Token Extensions Program 还通过 TokenMetadata 铸币扩展直接实现了相同的接口。使用 TokenMetadata，铸币会将代币的 name、symbol、uri、update_authority 以及自定义元数据直接存储在铸币账户本身上。

链下元数据 URI

uri 字段指向链下 JSON 元数据。请参见链下元数据格式。

这两个扩展解决不同的问题：

MetadataPointer 指定存储元数据的账户。
TokenMetadata 将元数据直接存储在铸币账户上。

可变长度扩展

TokenMetadata 是一个可变长度的 TLV 扩展。 InitializeTokenMetadata、UpdateField 和 RemoveKey 可以调整铸币账户数据的大小，但它们不会转移额外的 lamport。铸币账户需要足够的 lamport 来保持存储的元数据免于租金。如果元数据稍后增长，需要在调整大小的指令之前向铸币账户转移额外的 lamport。

如何在铸币账户上存储代币元数据

要在铸币账户上存储元数据：

计算铸币账户大小以及铸币、扩展和元数据所需的租金。
使用 CreateAccount 创建铸币账户，初始化 MetadataPointer，并使用 InitializeMint 初始化铸币。
在铸币账户上初始化 TokenMetadata，然后使用 UpdateField 添加或更新元数据。
使用 RemoveKey、UpdateAuthority 和 Emit 来删除自定义元数据、更改或清除更新权限，或在交易返回数据中返回当前元数据。

计算账户大小

计算基础铸币加上 MetadataPointer 扩展的铸币账户大小。这是在 CreateAccount 中使用的大小。

计算租金

在 TokenMetadata 存储到铸币账户后，使用所需的最大大小计算租金。

创建铸币账户

使用计算出的空间和 lamport 创建铸币账户。

初始化元数据指针

初始化 MetadataPointer 并将其元数据地址设置为铸币地址。

初始化铸币

在同一交易中使用 InitializeMint 初始化铸币。

初始化和更新元数据

在铸币账户上初始化 TokenMetadata。使用 UpdateField 添加自定义元数据；如果该字段不存在，UpdateField 会添加它。

更新、删除或发出元数据

铸币初始化后，使用 UpdateField 更新元数据，使用 UpdateMetadataPointer 更新元数据指针，使用 RemoveKey 删除自定义元数据，使用 UpdateAuthority 清除更新权限，并使用 Emit 返回当前元数据。

计算账户大小

计算基础铸币加上 MetadataPointer 扩展的铸币账户大小。这是在 CreateAccount 中使用的大小。

计算租金

在 TokenMetadata 存储到铸币账户后，使用所需的最大大小计算租金。

创建铸币账户

使用计算出的空间和 lamport 创建铸币账户。

初始化元数据指针

初始化 MetadataPointer 并将其元数据地址设置为铸币地址。

初始化铸币

在同一交易中使用 InitializeMint 初始化铸币。

初始化和更新元数据

在铸币账户上初始化 TokenMetadata。使用 UpdateField 添加自定义元数据；如果该字段不存在，UpdateField 会添加它。

更新、删除或发出元数据

Example

const client = await createClient()
  .use(generatedPayer())
  .use(
    solanaRpc({
      rpcUrl: "http://localhost:8899",
      rpcSubscriptionsUrl: "ws://localhost:8900"
    })
  )
  .use(rpcAirdrop())
  .use(airdropPayer(lamports(1_000_000_000n)));

const mint = await generateKeyPairSigner();

const metadataPointerExtension = extension("MetadataPointer", {
  authority: client.payer.address,
  metadataAddress: mint.address
});

const mintSpace = BigInt(getMintSize([metadataPointerExtension]));

指令顺序

MetadataPointerInstruction::Initialize 必须在 InitializeMint 之前执行。CreateAccount、 MetadataPointerInstruction::Initialize 和 InitializeMint 必须包含在同一个交易中。

源代码参考

元数据指针

项目	描述	源代码
`MetadataPointer`	存储元数据指针权限和元数据账户地址的铸币扩展。	源代码
`MetadataPointerInstruction::Initialize`	在 `InitializeMint` 之前初始化元数据指针扩展。	源代码
`MetadataPointerInstruction::Update`	更新铸币的元数据指针扩展中存储的元数据地址。	源代码
`process_initialize` (`MetadataPointer`)	元数据指针处理器逻辑，初始化时至少需要一个权限或元数据地址。	源代码
`process_update` (`MetadataPointer`)	验证元数据指针权限，然后重写铸币中存储的元数据地址。	源代码

代币元数据

项目	描述	源代码
`TokenMetadata`	存储在 TLV 条目中的可变长度代币元数据接口状态。	源代码
`Field`	由 `UpdateField` 使用的字段枚举，用于定位 `name`、`symbol`、`uri` 或自定义键。	源代码
`TokenMetadataInstruction::Initialize`	初始化代币元数据账户的基本 `name`、`symbol` 和 `uri` 字段。	源代码
`TokenMetadataInstruction::UpdateField`	在代币元数据上添加或更新基本字段或自定义元数据字段。	源代码
`TokenMetadataInstruction::RemoveKey`	删除自定义元数据键。无法使用此指令删除基本字段。	源代码
`TokenMetadataInstruction::UpdateAuthority`	轮换元数据更新权限，或完全清除它以使元数据不可变。	源代码
`TokenMetadataInstruction::Emit`	通过交易返回数据返回序列化的元数据，可选择指定字节范围。	源代码
`process_initialize` (`TokenMetadata`)	代币元数据处理器逻辑，要求元数据账户必须是铸币本身，且铸币必须具有 `MetadataPointer`。	源代码
`process_update_field`	在字段更新后重新分配并重写可变长度的 `TokenMetadata` TLV 条目。	源代码
`process_remove_key`	验证更新权限，删除自定义元数据键，并重写 TLV 条目。	源代码
`process_update_authority`	验证当前更新权限，然后就地轮换或清除元数据权限。	源代码
`process_emit`	从铸币中读取序列化的 `TokenMetadata`，并将请求的片段写入返回数据。	源代码

Typescript

下面的 Kit 示例直接使用生成的指令。使用 @solana/web3.js、@solana/spl-token 和 @solana/spl-token-metadata 的传统示例仅供参考。

Kit

Instructions

import {
  lamports,
  createClient,
  generateKeyPairSigner,
  unwrapOption
} from "@solana/kit";
import { solanaRpc, rpcAirdrop } from "@solana/kit-plugin-rpc";
import { generatedPayer, airdropPayer } from "@solana/kit-plugin-signer";
import { unpack as unpackTokenMetadata } from "@solana/spl-token-metadata";
import { getCreateAccountInstruction } from "@solana-program/system";
import {
  extension,
  fetchMint,
  getEmitTokenMetadataInstruction,
  getInitializeMetadataPointerInstruction,
  getInitializeMintInstruction,
  getInitializeTokenMetadataInstruction,
  getMintSize,
  getRemoveTokenMetadataKeyInstruction,
  getUpdateMetadataPointerInstruction,
  getUpdateTokenMetadataFieldInstruction,
  getUpdateTokenMetadataUpdateAuthorityInstruction,
  isExtension,
  tokenMetadataField,
  TOKEN_2022_PROGRAM_ADDRESS
} from "@solana-program/token-2022";

const client = await createClient()
  .use(generatedPayer())
  .use(
    solanaRpc({
      rpcUrl: "http://localhost:8899",
      rpcSubscriptionsUrl: "ws://localhost:8900"
    })
  )
  .use(rpcAirdrop())
  .use(airdropPayer(lamports(1_000_000_000n)));

const mint = await generateKeyPairSigner();

const metadataPointerExtension = extension("MetadataPointer", {
  authority: client.payer.address,
  metadataAddress: mint.address
});

const mintSpace = BigInt(getMintSize([metadataPointerExtension]));

const maxTokenMetadataExtension = extension("TokenMetadata", {
  updateAuthority: client.payer.address,
  mint: mint.address,
  name: "Example Token v2",
  symbol: "EXMPL",
  uri: "https://example.com/token.json",
  additionalMetadata: new Map([
    ["description", "Metadata stored on mint account"]
  ])
});
const maxMintSpace = BigInt(
  getMintSize([metadataPointerExtension, maxTokenMetadataExtension])
);
const mintRent = await client.rpc
  .getMinimumBalanceForRentExemption(maxMintSpace)
  .send();

await client.sendTransaction([
  getCreateAccountInstruction({
    payer: client.payer, // Account funding account creation.
    newAccount: mint, // New mint account to create.
    lamports: mintRent, // Lamports funding the mint account rent.
    space: mintSpace, // Account size in bytes for the mint plus MetadataPointer.
    programAddress: TOKEN_2022_PROGRAM_ADDRESS // Program that owns the mint account.
  }),
  getInitializeMetadataPointerInstruction({
    mint: mint.address, // Mint account that stores the MetadataPointer extension.
    authority: client.payer.address, // Authority allowed to update the metadata pointer later.
    metadataAddress: mint.address // Account address that stores the metadata.
  }),
  getInitializeMintInstruction({
    mint: mint.address, // Mint account to initialize.
    decimals: 0, // Number of decimals for the token.
    mintAuthority: client.payer.address, // Authority allowed to mint new tokens.
    freezeAuthority: client.payer.address // Authority allowed to freeze token accounts.
  }),
  getInitializeTokenMetadataInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer.address, // Authority allowed to update metadata later.
    mint: mint.address, // Mint that the metadata describes.
    mintAuthority: client.payer, // Signer authorizing metadata initialization for the mint.
    name: "Example Token", // Token name stored in metadata.
    symbol: "EXMPL", // Token symbol stored in metadata.
    uri: "https://example.com/token.json" // URI pointing to off-chain JSON metadata.
  }),
  getUpdateTokenMetadataFieldInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Signer authorized to update metadata fields.
    field: tokenMetadataField("Key", ["description"]), // Custom metadata field to add.
    value: "Metadata stored on mint account" // Value stored for the custom metadata field.
  })
]);

const initialMintAccount = await fetchMint(client.rpc, mint.address);
const initialExtensions =
  unwrapOption(initialMintAccount.data.extensions) ?? [];
const initialTokenMetadata = initialExtensions.find((item) =>
  isExtension("TokenMetadata", item)
);

console.dir(
  {
    mint: mint.address,
    tokenMetadata: initialTokenMetadata
  },
  { depth: null }
);

const updateMetadataTransaction = await client.sendTransaction([
  getUpdateTokenMetadataFieldInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Signer authorized to update metadata fields.
    field: tokenMetadataField("Name"), // Base metadata field to update.
    value: "Example Token v2" // Updated value for the token name.
  }),
  getUpdateMetadataPointerInstruction({
    mint: mint.address, // Mint account that stores the MetadataPointer extension.
    metadataPointerAuthority: client.payer, // Signer authorized to update the metadata pointer.
    metadataAddress: mint.address // Account address that stores the metadata.
  }),
  getRemoveTokenMetadataKeyInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Signer authorized to remove custom metadata.
    key: "description" // Custom metadata key to remove.
  }),
  getUpdateTokenMetadataUpdateAuthorityInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Current signer authorized to change the update authority.
    newUpdateAuthority: null // Clear the update authority so metadata can no longer be changed.
  }),
  getEmitTokenMetadataInstruction({
    metadata: mint.address // Mint account that stores the metadata to emit.
  })
]);

const updateMetadataResult = await client.rpc
  .getTransaction(updateMetadataTransaction.context.signature, {
    encoding: "json",
    maxSupportedTransactionVersion: 0
  })
  .send();
const emittedDataBase64 = updateMetadataResult?.meta?.returnData?.data?.[0];
if (!emittedDataBase64) {
  throw new Error("Expected token metadata return data");
}
const emittedTokenMetadata = unpackTokenMetadata(
  Buffer.from(emittedDataBase64, "base64")
);

const mintAccount = await fetchMint(client.rpc, mint.address);
const extensions = unwrapOption(mintAccount.data.extensions) ?? [];
const metadataPointer = extensions.find((item) =>
  isExtension("MetadataPointer", item)
);
const tokenMetadata = extensions.find((item) =>
  isExtension("TokenMetadata", item)
);

console.dir(
  {
    mint: mint.address,
    metadataPointer,
    tokenMetadata,
    emittedTokenMetadata
  },
  { depth: null }
);

Console

Click to execute the code.

Instructions

import {
  lamports,
  createClient,
  generateKeyPairSigner,
  unwrapOption
} from "@solana/kit";
import { solanaRpc, rpcAirdrop } from "@solana/kit-plugin-rpc";
import { generatedPayer, airdropPayer } from "@solana/kit-plugin-signer";
import { unpack as unpackTokenMetadata } from "@solana/spl-token-metadata";
import { getCreateAccountInstruction } from "@solana-program/system";
import {
  extension,
  fetchMint,
  getEmitTokenMetadataInstruction,
  getInitializeMetadataPointerInstruction,
  getInitializeMintInstruction,
  getInitializeTokenMetadataInstruction,
  getMintSize,
  getRemoveTokenMetadataKeyInstruction,
  getUpdateMetadataPointerInstruction,
  getUpdateTokenMetadataFieldInstruction,
  getUpdateTokenMetadataUpdateAuthorityInstruction,
  isExtension,
  tokenMetadataField,
  TOKEN_2022_PROGRAM_ADDRESS
} from "@solana-program/token-2022";

const client = await createClient()
  .use(generatedPayer())
  .use(
    solanaRpc({
      rpcUrl: "http://localhost:8899",
      rpcSubscriptionsUrl: "ws://localhost:8900"
    })
  )
  .use(rpcAirdrop())
  .use(airdropPayer(lamports(1_000_000_000n)));

const mint = await generateKeyPairSigner();

const metadataPointerExtension = extension("MetadataPointer", {
  authority: client.payer.address,
  metadataAddress: mint.address
});

const mintSpace = BigInt(getMintSize([metadataPointerExtension]));

const maxTokenMetadataExtension = extension("TokenMetadata", {
  updateAuthority: client.payer.address,
  mint: mint.address,
  name: "Example Token v2",
  symbol: "EXMPL",
  uri: "https://example.com/token.json",
  additionalMetadata: new Map([
    ["description", "Metadata stored on mint account"]
  ])
});
const maxMintSpace = BigInt(
  getMintSize([metadataPointerExtension, maxTokenMetadataExtension])
);
const mintRent = await client.rpc
  .getMinimumBalanceForRentExemption(maxMintSpace)
  .send();

await client.sendTransaction([
  getCreateAccountInstruction({
    payer: client.payer, // Account funding account creation.
    newAccount: mint, // New mint account to create.
    lamports: mintRent, // Lamports funding the mint account rent.
    space: mintSpace, // Account size in bytes for the mint plus MetadataPointer.
    programAddress: TOKEN_2022_PROGRAM_ADDRESS // Program that owns the mint account.
  }),
  getInitializeMetadataPointerInstruction({
    mint: mint.address, // Mint account that stores the MetadataPointer extension.
    authority: client.payer.address, // Authority allowed to update the metadata pointer later.
    metadataAddress: mint.address // Account address that stores the metadata.
  }),
  getInitializeMintInstruction({
    mint: mint.address, // Mint account to initialize.
    decimals: 0, // Number of decimals for the token.
    mintAuthority: client.payer.address, // Authority allowed to mint new tokens.
    freezeAuthority: client.payer.address // Authority allowed to freeze token accounts.
  }),
  getInitializeTokenMetadataInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer.address, // Authority allowed to update metadata later.
    mint: mint.address, // Mint that the metadata describes.
    mintAuthority: client.payer, // Signer authorizing metadata initialization for the mint.
    name: "Example Token", // Token name stored in metadata.
    symbol: "EXMPL", // Token symbol stored in metadata.
    uri: "https://example.com/token.json" // URI pointing to off-chain JSON metadata.
  }),
  getUpdateTokenMetadataFieldInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Signer authorized to update metadata fields.
    field: tokenMetadataField("Key", ["description"]), // Custom metadata field to add.
    value: "Metadata stored on mint account" // Value stored for the custom metadata field.
  })
]);

const initialMintAccount = await fetchMint(client.rpc, mint.address);
const initialExtensions =
  unwrapOption(initialMintAccount.data.extensions) ?? [];
const initialTokenMetadata = initialExtensions.find((item) =>
  isExtension("TokenMetadata", item)
);

console.dir(
  {
    mint: mint.address,
    tokenMetadata: initialTokenMetadata
  },
  { depth: null }
);

const updateMetadataTransaction = await client.sendTransaction([
  getUpdateTokenMetadataFieldInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Signer authorized to update metadata fields.
    field: tokenMetadataField("Name"), // Base metadata field to update.
    value: "Example Token v2" // Updated value for the token name.
  }),
  getUpdateMetadataPointerInstruction({
    mint: mint.address, // Mint account that stores the MetadataPointer extension.
    metadataPointerAuthority: client.payer, // Signer authorized to update the metadata pointer.
    metadataAddress: mint.address // Account address that stores the metadata.
  }),
  getRemoveTokenMetadataKeyInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Signer authorized to remove custom metadata.
    key: "description" // Custom metadata key to remove.
  }),
  getUpdateTokenMetadataUpdateAuthorityInstruction({
    metadata: mint.address, // Mint account that stores the metadata.
    updateAuthority: client.payer, // Current signer authorized to change the update authority.
    newUpdateAuthority: null // Clear the update authority so metadata can no longer be changed.
  }),
  getEmitTokenMetadataInstruction({
    metadata: mint.address // Mint account that stores the metadata to emit.
  })
]);

const updateMetadataResult = await client.rpc
  .getTransaction(updateMetadataTransaction.context.signature, {
    encoding: "json",
    maxSupportedTransactionVersion: 0
  })
  .send();
const emittedDataBase64 = updateMetadataResult?.meta?.returnData?.data?.[0];
if (!emittedDataBase64) {
  throw new Error("Expected token metadata return data");
}
const emittedTokenMetadata = unpackTokenMetadata(
  Buffer.from(emittedDataBase64, "base64")
);

const mintAccount = await fetchMint(client.rpc, mint.address);
const extensions = unwrapOption(mintAccount.data.extensions) ?? [];
const metadataPointer = extensions.find((item) =>
  isExtension("MetadataPointer", item)
);
const tokenMetadata = extensions.find((item) =>
  isExtension("TokenMetadata", item)
);

console.dir(
  {
    mint: mint.address,
    metadataPointer,
    tokenMetadata,
    emittedTokenMetadata
  },
  { depth: null }
);

Console

Click to execute the code.

Web3.js

Instructions

import {
  Connection,
  Keypair,
  LAMPORTS_PER_SOL,
  sendAndConfirmTransaction,
  SystemProgram,
  Transaction
} from "@solana/web3.js";
import {
  createInitializeMetadataPointerInstruction,
  createInitializeMintInstruction,
  createUpdateMetadataPointerInstruction,
  ExtensionType,
  getMetadataPointerState,
  getMint,
  getMintLen,
  getTokenMetadata,
  LENGTH_SIZE,
  TOKEN_2022_PROGRAM_ID,
  TYPE_SIZE
} from "@solana/spl-token";
import {
  createInitializeInstruction,
  createEmitInstruction,
  createRemoveKeyInstruction,
  unpack as unpackTokenMetadata,
  createUpdateAuthorityInstruction,
  createUpdateFieldInstruction,
  pack,
  type TokenMetadata
} from "@solana/spl-token-metadata";

const connection = new Connection("http://localhost:8899", "confirmed");
const latestBlockhash = await connection.getLatestBlockhash();

const feePayer = Keypair.generate();
const mint = Keypair.generate();

const airdropSignature = await connection.requestAirdrop(
  feePayer.publicKey,
  LAMPORTS_PER_SOL
);
await connection.confirmTransaction({
  blockhash: latestBlockhash.blockhash,
  lastValidBlockHeight: latestBlockhash.lastValidBlockHeight,
  signature: airdropSignature
});

const maxMetadata: TokenMetadata = {
  updateAuthority: feePayer.publicKey,
  mint: mint.publicKey,
  name: "Example Token v2",
  symbol: "EXMPL",
  uri: "https://example.com/token.json",
  additionalMetadata: [["description", "Metadata stored on mint account"]]
};

const mintSpace = getMintLen([ExtensionType.MetadataPointer]);
const metadataSpace = TYPE_SIZE + LENGTH_SIZE + pack(maxMetadata).length;
const mintRent = await connection.getMinimumBalanceForRentExemption(
  mintSpace + metadataSpace
);

await sendAndConfirmTransaction(
  connection,
  new Transaction().add(
    SystemProgram.createAccount({
      fromPubkey: feePayer.publicKey, // Account funding account creation.
      newAccountPubkey: mint.publicKey, // New mint account to create.
      lamports: mintRent, // Lamports funding the mint account rent.
      space: mintSpace, // Account size in bytes for the mint plus MetadataPointer.
      programId: TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    }),
    createInitializeMetadataPointerInstruction(
      mint.publicKey, // Mint account that stores the MetadataPointer extension.
      feePayer.publicKey, // Authority allowed to update the metadata pointer later.
      mint.publicKey, // Account address that stores the metadata.
      TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    ),
    createInitializeMintInstruction(
      mint.publicKey, // Mint account to initialize.
      0, // Number of decimals for the token.
      feePayer.publicKey, // Authority allowed to mint new tokens.
      feePayer.publicKey, // Authority allowed to freeze token accounts.
      TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    ),
    createInitializeInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the mint and metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to update metadata later.
      mint: mint.publicKey, // Mint that the metadata describes.
      mintAuthority: feePayer.publicKey, // Signer authorizing metadata initialization for the mint.
      name: "Example Token", // Token name stored in metadata.
      symbol: "EXMPL", // Token symbol stored in metadata.
      uri: "https://example.com/token.json" // URI pointing to off-chain JSON metadata.
    }),
    createUpdateFieldInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to update metadata fields.
      field: "description", // Custom metadata field to add.
      value: "Metadata stored on mint account" // Value stored for the custom metadata field.
    })
  ),
  [feePayer, mint],
  { commitment: "confirmed" }
);

const initialTokenMetadata = await getTokenMetadata(
  connection,
  mint.publicKey,
  "confirmed",
  TOKEN_2022_PROGRAM_ID
);

console.log(
  JSON.stringify(
    {
      mint: mint.publicKey,
      tokenMetadata: initialTokenMetadata
    },
    null,
    2
  )
);

const updateMetadataSignature = await sendAndConfirmTransaction(
  connection,
  new Transaction().add(
    createUpdateFieldInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to update metadata fields.
      field: "name", // Base metadata field to update.
      value: "Example Token v2" // Updated value for the token name.
    }),
    createUpdateMetadataPointerInstruction(
      mint.publicKey, // Mint account that stores the MetadataPointer extension.
      feePayer.publicKey, // Authority allowed to update the metadata pointer.
      mint.publicKey, // Account address that stores the metadata.
      [], // Additional signer accounts required by the instruction.
      TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    ),
    createRemoveKeyInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to remove custom metadata.
      key: "description", // Custom metadata key to remove.
      idempotent: false // Fail if the custom metadata key does not exist.
    }),
    createUpdateAuthorityInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      oldAuthority: feePayer.publicKey, // Current authority allowed to change the update authority.
      newAuthority: null // Clear the update authority so metadata can no longer be changed.
    }),
    createEmitInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey // Mint account that stores the metadata to emit.
    })
  ),
  [feePayer],
  { commitment: "confirmed" }
);

const updateMetadataTransaction = (await connection.getTransaction(
  updateMetadataSignature,
  {
    maxSupportedTransactionVersion: 0
  }
)) as any;
const emittedDataBase64 =
  updateMetadataTransaction?.meta?.returnData?.data?.[0];
if (!emittedDataBase64) {
  throw new Error("Expected token metadata return data");
}
const emittedTokenMetadata = unpackTokenMetadata(
  Buffer.from(emittedDataBase64, "base64")
);

const mintAccount = await getMint(
  connection,
  mint.publicKey,
  "confirmed",
  TOKEN_2022_PROGRAM_ID
);
const metadataPointer = getMetadataPointerState(mintAccount);
const tokenMetadata = await getTokenMetadata(
  connection,
  mint.publicKey,
  "confirmed",
  TOKEN_2022_PROGRAM_ID
);

console.log(
  JSON.stringify(
    {
      mint: mint.publicKey,
      metadataPointer,
      tokenMetadata,
      emittedTokenMetadata
    },
    null,
    2
  )
);

Console

Click to execute the code.

Instructions

import {
  Connection,
  Keypair,
  LAMPORTS_PER_SOL,
  sendAndConfirmTransaction,
  SystemProgram,
  Transaction
} from "@solana/web3.js";
import {
  createInitializeMetadataPointerInstruction,
  createInitializeMintInstruction,
  createUpdateMetadataPointerInstruction,
  ExtensionType,
  getMetadataPointerState,
  getMint,
  getMintLen,
  getTokenMetadata,
  LENGTH_SIZE,
  TOKEN_2022_PROGRAM_ID,
  TYPE_SIZE
} from "@solana/spl-token";
import {
  createInitializeInstruction,
  createEmitInstruction,
  createRemoveKeyInstruction,
  unpack as unpackTokenMetadata,
  createUpdateAuthorityInstruction,
  createUpdateFieldInstruction,
  pack,
  type TokenMetadata
} from "@solana/spl-token-metadata";

const connection = new Connection("http://localhost:8899", "confirmed");
const latestBlockhash = await connection.getLatestBlockhash();

const feePayer = Keypair.generate();
const mint = Keypair.generate();

const airdropSignature = await connection.requestAirdrop(
  feePayer.publicKey,
  LAMPORTS_PER_SOL
);
await connection.confirmTransaction({
  blockhash: latestBlockhash.blockhash,
  lastValidBlockHeight: latestBlockhash.lastValidBlockHeight,
  signature: airdropSignature
});

const maxMetadata: TokenMetadata = {
  updateAuthority: feePayer.publicKey,
  mint: mint.publicKey,
  name: "Example Token v2",
  symbol: "EXMPL",
  uri: "https://example.com/token.json",
  additionalMetadata: [["description", "Metadata stored on mint account"]]
};

const mintSpace = getMintLen([ExtensionType.MetadataPointer]);
const metadataSpace = TYPE_SIZE + LENGTH_SIZE + pack(maxMetadata).length;
const mintRent = await connection.getMinimumBalanceForRentExemption(
  mintSpace + metadataSpace
);

await sendAndConfirmTransaction(
  connection,
  new Transaction().add(
    SystemProgram.createAccount({
      fromPubkey: feePayer.publicKey, // Account funding account creation.
      newAccountPubkey: mint.publicKey, // New mint account to create.
      lamports: mintRent, // Lamports funding the mint account rent.
      space: mintSpace, // Account size in bytes for the mint plus MetadataPointer.
      programId: TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    }),
    createInitializeMetadataPointerInstruction(
      mint.publicKey, // Mint account that stores the MetadataPointer extension.
      feePayer.publicKey, // Authority allowed to update the metadata pointer later.
      mint.publicKey, // Account address that stores the metadata.
      TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    ),
    createInitializeMintInstruction(
      mint.publicKey, // Mint account to initialize.
      0, // Number of decimals for the token.
      feePayer.publicKey, // Authority allowed to mint new tokens.
      feePayer.publicKey, // Authority allowed to freeze token accounts.
      TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    ),
    createInitializeInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the mint and metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to update metadata later.
      mint: mint.publicKey, // Mint that the metadata describes.
      mintAuthority: feePayer.publicKey, // Signer authorizing metadata initialization for the mint.
      name: "Example Token", // Token name stored in metadata.
      symbol: "EXMPL", // Token symbol stored in metadata.
      uri: "https://example.com/token.json" // URI pointing to off-chain JSON metadata.
    }),
    createUpdateFieldInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to update metadata fields.
      field: "description", // Custom metadata field to add.
      value: "Metadata stored on mint account" // Value stored for the custom metadata field.
    })
  ),
  [feePayer, mint],
  { commitment: "confirmed" }
);

const initialTokenMetadata = await getTokenMetadata(
  connection,
  mint.publicKey,
  "confirmed",
  TOKEN_2022_PROGRAM_ID
);

console.log(
  JSON.stringify(
    {
      mint: mint.publicKey,
      tokenMetadata: initialTokenMetadata
    },
    null,
    2
  )
);

const updateMetadataSignature = await sendAndConfirmTransaction(
  connection,
  new Transaction().add(
    createUpdateFieldInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to update metadata fields.
      field: "name", // Base metadata field to update.
      value: "Example Token v2" // Updated value for the token name.
    }),
    createUpdateMetadataPointerInstruction(
      mint.publicKey, // Mint account that stores the MetadataPointer extension.
      feePayer.publicKey, // Authority allowed to update the metadata pointer.
      mint.publicKey, // Account address that stores the metadata.
      [], // Additional signer accounts required by the instruction.
      TOKEN_2022_PROGRAM_ID // Program that owns the mint account.
    ),
    createRemoveKeyInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      updateAuthority: feePayer.publicKey, // Authority allowed to remove custom metadata.
      key: "description", // Custom metadata key to remove.
      idempotent: false // Fail if the custom metadata key does not exist.
    }),
    createUpdateAuthorityInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey, // Mint account that stores the metadata.
      oldAuthority: feePayer.publicKey, // Current authority allowed to change the update authority.
      newAuthority: null // Clear the update authority so metadata can no longer be changed.
    }),
    createEmitInstruction({
      programId: TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
      metadata: mint.publicKey // Mint account that stores the metadata to emit.
    })
  ),
  [feePayer],
  { commitment: "confirmed" }
);

const updateMetadataTransaction = (await connection.getTransaction(
  updateMetadataSignature,
  {
    maxSupportedTransactionVersion: 0
  }
)) as any;
const emittedDataBase64 =
  updateMetadataTransaction?.meta?.returnData?.data?.[0];
if (!emittedDataBase64) {
  throw new Error("Expected token metadata return data");
}
const emittedTokenMetadata = unpackTokenMetadata(
  Buffer.from(emittedDataBase64, "base64")
);

const mintAccount = await getMint(
  connection,
  mint.publicKey,
  "confirmed",
  TOKEN_2022_PROGRAM_ID
);
const metadataPointer = getMetadataPointerState(mintAccount);
const tokenMetadata = await getTokenMetadata(
  connection,
  mint.publicKey,
  "confirmed",
  TOKEN_2022_PROGRAM_ID
);

console.log(
  JSON.stringify(
    {
      mint: mint.publicKey,
      metadataPointer,
      tokenMetadata,
      emittedTokenMetadata
    },
    null,
    2
  )
);

Console

Click to execute the code.

Rust

use anyhow::{anyhow, Result};
use base64::prelude::{Engine as _, BASE64_STANDARD};
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_client::rpc_config::RpcTransactionConfig;
use solana_commitment_config::CommitmentConfig;
use solana_sdk::{
    pubkey::Pubkey,
    signature::{Keypair, Signer},
    transaction::Transaction,
};
use solana_transaction_status_client_types::UiTransactionEncoding;
use solana_system_interface::instruction::create_account;
use spl_token_2022_interface::{
    extension::{
        metadata_pointer::{
            instruction::{
                initialize as initialize_metadata_pointer,
                update as update_metadata_pointer,
            },
            MetadataPointer,
        },
        BaseStateWithExtensions, ExtensionType, StateWithExtensions,
    },
    instruction::initialize_mint,
    state::Mint,
    ID as TOKEN_2022_PROGRAM_ID,
};
use spl_token_metadata_interface::{
    borsh::BorshDeserialize,
    instruction::{
        emit as emit_token_metadata, initialize as initialize_token_metadata,
        remove_key as remove_token_metadata_key,
        update_authority as update_token_metadata_authority,
        update_field as update_token_metadata_field,
    },
    state::{Field, TokenMetadata},
};

#[tokio::main]
async fn main() -> Result<()> {
    let client = RpcClient::new_with_commitment(
        String::from("http://localhost:8899"),
        CommitmentConfig::confirmed(),
    );

    let fee_payer = Keypair::new();

    let airdrop_signature = client
        .request_airdrop(&fee_payer.pubkey(), 1_000_000_000)
        .await?;
    loop {
        let confirmed = client.confirm_transaction(&airdrop_signature).await?;
        if confirmed {
            break;
        }
    }

    let mint = Keypair::new();
    let max_token_metadata = TokenMetadata {
        update_authority: Some(fee_payer.pubkey()).try_into()?,
        mint: mint.pubkey(),
        name: "Example Token v2".to_string(),
        symbol: "EXMPL".to_string(),
        uri: "https://example.com/token.json".to_string(),
        additional_metadata: vec![(
            "description".to_string(),
            "Metadata stored on mint account".to_string(),
        )],
    };

    let mint_space =
        ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::MetadataPointer])?;
    let mint_rent = client
        .get_minimum_balance_for_rent_exemption(mint_space + max_token_metadata.tlv_size_of()?)
        .await?;

    let create_mint_transaction = Transaction::new_signed_with_payer(
        &[
            create_account(
                &fee_payer.pubkey(), // Account funding account creation.
                &mint.pubkey(), // New mint account to create.
                mint_rent, // Lamports funding the mint account rent.
                mint_space as u64, // Account size in bytes for the mint plus MetadataPointer.
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
            ),
            initialize_metadata_pointer(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
                &mint.pubkey(), // Mint account that stores the MetadataPointer extension.
                Some(fee_payer.pubkey()), // Authority allowed to update the metadata pointer later.
                Some(mint.pubkey()), // Account address that stores the metadata.
            )?,
            initialize_mint(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
                &mint.pubkey(), // Mint account to initialize.
                &fee_payer.pubkey(), // Authority allowed to mint new tokens.
                Some(&fee_payer.pubkey()), // Authority allowed to freeze token accounts.
                0, // Number of decimals for the token.
            )?,
            initialize_token_metadata(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint and metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to update metadata later.
                &mint.pubkey(), // Mint that the metadata describes.
                &fee_payer.pubkey(), // Signer authorizing metadata initialization for the mint.
                "Example Token".to_string(), // Token name stored in metadata.
                "EXMPL".to_string(), // Token symbol stored in metadata.
                "https://example.com/token.json".to_string(), // URI pointing to off-chain JSON metadata.
            ),
            update_token_metadata_field(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to update metadata fields.
                Field::Key("description".to_string()), // Custom metadata field to add.
                "Metadata stored on mint account".to_string(), // Value stored for the custom metadata field.
            ),
        ],
        Some(&fee_payer.pubkey()),
        &[&fee_payer, &mint],
        client.get_latest_blockhash().await?,
    );
    client
        .send_and_confirm_transaction(&create_mint_transaction)
        .await?;

    let initial_mint_account = client.get_account(&mint.pubkey()).await?;
    let initial_mint_state = StateWithExtensions::<Mint>::unpack(&initial_mint_account.data)?;
    let initial_token_metadata = initial_mint_state.get_variable_len_extension::<TokenMetadata>()?;

    println!("Mint: {}", mint.pubkey());
    println!("Token Metadata: {:#?}", initial_token_metadata);

    let update_metadata_transaction = Transaction::new_signed_with_payer(
        &[
            update_token_metadata_field(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to update metadata fields.
                Field::Name, // Base metadata field to update.
                "Example Token v2".to_string(), // Updated value for the token name.
            ),
            update_metadata_pointer(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
                &mint.pubkey(), // Mint account that stores the MetadataPointer extension.
                &fee_payer.pubkey(), // Authority allowed to update the metadata pointer.
                &[], // Additional signer accounts required by the instruction.
                Some(mint.pubkey()), // Account address that stores the metadata.
            )?,
            remove_token_metadata_key(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to remove custom metadata.
                "description".to_string(), // Custom metadata key to remove.
                false, // Fail if the custom metadata key does not exist.
            ),
            update_token_metadata_authority(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Current authority allowed to change the update authority.
                None::<Pubkey>.try_into()?, // Clear the update authority so metadata can no longer be changed.
            ),
            emit_token_metadata(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata to emit.
                None, // Start offset for the emitted metadata slice.
                None, // End offset for the emitted metadata slice.
            ),
        ],
        Some(&fee_payer.pubkey()),
        &[&fee_payer],
        client.get_latest_blockhash().await?,
    );
    let update_metadata_signature = client
        .send_and_confirm_transaction(&update_metadata_transaction)
        .await?;

    let update_metadata_result = client
        .get_transaction_with_config(
            &update_metadata_signature,
            RpcTransactionConfig {
                encoding: Some(UiTransactionEncoding::Json),
                commitment: Some(CommitmentConfig::confirmed()),
                max_supported_transaction_version: Some(0),
            },
        )
        .await?;
    let emitted_data = BASE64_STANDARD.decode(
        update_metadata_result
        .transaction
        .meta
        .and_then(|meta| meta.return_data.map(|return_data| return_data.data.0))
        .ok_or_else(|| anyhow!("Expected token metadata return data"))?,
    )?;
    let emitted_token_metadata = TokenMetadata::try_from_slice(&emitted_data)?;

    let mint_account = client.get_account(&mint.pubkey()).await?;
    let mint_state = StateWithExtensions::<Mint>::unpack(&mint_account.data)?;
    let metadata_pointer = mint_state.get_extension::<MetadataPointer>()?;
    let token_metadata = mint_state.get_variable_len_extension::<TokenMetadata>()?;

    println!("Mint: {}", mint.pubkey());
    println!("Metadata Pointer: {:#?}", metadata_pointer);
    println!("Token Metadata: {:#?}", token_metadata);
    println!("Emitted Token Metadata: {:#?}", emitted_token_metadata);

    Ok(())
}

Console

Click to execute the code.

Rust

use anyhow::{anyhow, Result};
use base64::prelude::{Engine as _, BASE64_STANDARD};
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_client::rpc_config::RpcTransactionConfig;
use solana_commitment_config::CommitmentConfig;
use solana_sdk::{
    pubkey::Pubkey,
    signature::{Keypair, Signer},
    transaction::Transaction,
};
use solana_transaction_status_client_types::UiTransactionEncoding;
use solana_system_interface::instruction::create_account;
use spl_token_2022_interface::{
    extension::{
        metadata_pointer::{
            instruction::{
                initialize as initialize_metadata_pointer,
                update as update_metadata_pointer,
            },
            MetadataPointer,
        },
        BaseStateWithExtensions, ExtensionType, StateWithExtensions,
    },
    instruction::initialize_mint,
    state::Mint,
    ID as TOKEN_2022_PROGRAM_ID,
};
use spl_token_metadata_interface::{
    borsh::BorshDeserialize,
    instruction::{
        emit as emit_token_metadata, initialize as initialize_token_metadata,
        remove_key as remove_token_metadata_key,
        update_authority as update_token_metadata_authority,
        update_field as update_token_metadata_field,
    },
    state::{Field, TokenMetadata},
};

#[tokio::main]
async fn main() -> Result<()> {
    let client = RpcClient::new_with_commitment(
        String::from("http://localhost:8899"),
        CommitmentConfig::confirmed(),
    );

    let fee_payer = Keypair::new();

    let airdrop_signature = client
        .request_airdrop(&fee_payer.pubkey(), 1_000_000_000)
        .await?;
    loop {
        let confirmed = client.confirm_transaction(&airdrop_signature).await?;
        if confirmed {
            break;
        }
    }

    let mint = Keypair::new();
    let max_token_metadata = TokenMetadata {
        update_authority: Some(fee_payer.pubkey()).try_into()?,
        mint: mint.pubkey(),
        name: "Example Token v2".to_string(),
        symbol: "EXMPL".to_string(),
        uri: "https://example.com/token.json".to_string(),
        additional_metadata: vec![(
            "description".to_string(),
            "Metadata stored on mint account".to_string(),
        )],
    };

    let mint_space =
        ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::MetadataPointer])?;
    let mint_rent = client
        .get_minimum_balance_for_rent_exemption(mint_space + max_token_metadata.tlv_size_of()?)
        .await?;

    let create_mint_transaction = Transaction::new_signed_with_payer(
        &[
            create_account(
                &fee_payer.pubkey(), // Account funding account creation.
                &mint.pubkey(), // New mint account to create.
                mint_rent, // Lamports funding the mint account rent.
                mint_space as u64, // Account size in bytes for the mint plus MetadataPointer.
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
            ),
            initialize_metadata_pointer(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
                &mint.pubkey(), // Mint account that stores the MetadataPointer extension.
                Some(fee_payer.pubkey()), // Authority allowed to update the metadata pointer later.
                Some(mint.pubkey()), // Account address that stores the metadata.
            )?,
            initialize_mint(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
                &mint.pubkey(), // Mint account to initialize.
                &fee_payer.pubkey(), // Authority allowed to mint new tokens.
                Some(&fee_payer.pubkey()), // Authority allowed to freeze token accounts.
                0, // Number of decimals for the token.
            )?,
            initialize_token_metadata(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint and metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to update metadata later.
                &mint.pubkey(), // Mint that the metadata describes.
                &fee_payer.pubkey(), // Signer authorizing metadata initialization for the mint.
                "Example Token".to_string(), // Token name stored in metadata.
                "EXMPL".to_string(), // Token symbol stored in metadata.
                "https://example.com/token.json".to_string(), // URI pointing to off-chain JSON metadata.
            ),
            update_token_metadata_field(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to update metadata fields.
                Field::Key("description".to_string()), // Custom metadata field to add.
                "Metadata stored on mint account".to_string(), // Value stored for the custom metadata field.
            ),
        ],
        Some(&fee_payer.pubkey()),
        &[&fee_payer, &mint],
        client.get_latest_blockhash().await?,
    );
    client
        .send_and_confirm_transaction(&create_mint_transaction)
        .await?;

    let initial_mint_account = client.get_account(&mint.pubkey()).await?;
    let initial_mint_state = StateWithExtensions::<Mint>::unpack(&initial_mint_account.data)?;
    let initial_token_metadata = initial_mint_state.get_variable_len_extension::<TokenMetadata>()?;

    println!("Mint: {}", mint.pubkey());
    println!("Token Metadata: {:#?}", initial_token_metadata);

    let update_metadata_transaction = Transaction::new_signed_with_payer(
        &[
            update_token_metadata_field(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to update metadata fields.
                Field::Name, // Base metadata field to update.
                "Example Token v2".to_string(), // Updated value for the token name.
            ),
            update_metadata_pointer(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the mint account.
                &mint.pubkey(), // Mint account that stores the MetadataPointer extension.
                &fee_payer.pubkey(), // Authority allowed to update the metadata pointer.
                &[], // Additional signer accounts required by the instruction.
                Some(mint.pubkey()), // Account address that stores the metadata.
            )?,
            remove_token_metadata_key(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Authority allowed to remove custom metadata.
                "description".to_string(), // Custom metadata key to remove.
                false, // Fail if the custom metadata key does not exist.
            ),
            update_token_metadata_authority(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata.
                &fee_payer.pubkey(), // Current authority allowed to change the update authority.
                None::<Pubkey>.try_into()?, // Clear the update authority so metadata can no longer be changed.
            ),
            emit_token_metadata(
                &TOKEN_2022_PROGRAM_ID, // Program that owns the metadata.
                &mint.pubkey(), // Mint account that stores the metadata to emit.
                None, // Start offset for the emitted metadata slice.
                None, // End offset for the emitted metadata slice.
            ),
        ],
        Some(&fee_payer.pubkey()),
        &[&fee_payer],
        client.get_latest_blockhash().await?,
    );
    let update_metadata_signature = client
        .send_and_confirm_transaction(&update_metadata_transaction)
        .await?;

    let update_metadata_result = client
        .get_transaction_with_config(
            &update_metadata_signature,
            RpcTransactionConfig {
                encoding: Some(UiTransactionEncoding::Json),
                commitment: Some(CommitmentConfig::confirmed()),
                max_supported_transaction_version: Some(0),
            },
        )
        .await?;
    let emitted_data = BASE64_STANDARD.decode(
        update_metadata_result
        .transaction
        .meta
        .and_then(|meta| meta.return_data.map(|return_data| return_data.data.0))
        .ok_or_else(|| anyhow!("Expected token metadata return data"))?,
    )?;
    let emitted_token_metadata = TokenMetadata::try_from_slice(&emitted_data)?;

    let mint_account = client.get_account(&mint.pubkey()).await?;
    let mint_state = StateWithExtensions::<Mint>::unpack(&mint_account.data)?;
    let metadata_pointer = mint_state.get_extension::<MetadataPointer>()?;
    let token_metadata = mint_state.get_variable_len_extension::<TokenMetadata>()?;

    println!("Mint: {}", mint.pubkey());
    println!("Metadata Pointer: {:#?}", metadata_pointer);
    println!("Token Metadata: {:#?}", token_metadata);
    println!("Emitted Token Metadata: {:#?}", emitted_token_metadata);

    Ok(())
}

Console

Click to execute the code.

计算账户大小

计算租金

创建铸币账户

初始化元数据指针

初始化铸币

初始化和更新元数据

更新、删除或发出元数据

计算账户大小

计算租金

创建铸币账户

初始化元数据指针

初始化铸币

初始化和更新元数据

更新、删除或发出元数据

Table of Contents