Bakar Token

Apa Fungsi Pembakaran?

Membakar token secara permanen mengurangi saldo token account dan mengurangi total pasokan mint dalam jumlah yang sama.

Cara Membakar Token

Membakar token menggunakan instruksi Burn atau BurnChecked dari Token Program.

Contoh di bawah ini menggunakan BurnChecked, yang mengharuskan pemanggil menyediakan desimal mint sehingga instruksi dapat memverifikasi presisi token yang diharapkan sebelum membakar.

Native mint tidak mendukung pembakaran. Gunakan CloseAccount sebagai gantinya.

Pemilik token account atau delegasi yang disetujui menandatangani transaksi. Dalam Token Extensions Program, delegasi permanen mint juga dapat mengotorisasi pembakaran jika mint memiliki ekstensi delegasi permanen yang diaktifkan.

Referensi Sumber

ItemDeskripsiToken ProgramToken Extensions Program
MintState mint menyimpan total pasokan token.SumberSumber
AccountState token account menyimpan saldo token yang dikurangi oleh pembakaran.SumberSumber
BurnInstruksi burn yang mengurangi saldo token account dan pasokan mint tanpa mengharuskan pemanggil menyediakan desimal mint.SumberSumber
BurnCheckedInstruksi burn yang mengharuskan pemanggil menyediakan desimal mint dan memeriksa nilai tersebut sebelum mengurangi saldo token account dan pasokan mint.SumberSumber
process_burnLogika prosesor bersama untuk pembakaran token.SumberSumber

Typescript

Contoh Kit di bawah ini menunjukkan pendekatan yang direkomendasikan menggunakan @solana/kit. Contoh lama menggunakan @solana/web3.js disertakan sebagai referensi.

Kit

import { generateKeyPairSigner } from "@solana/kit";
import { createLocalClient } from "@solana/kit-client-rpc";
import {
findAssociatedTokenPda,
tokenProgram,
TOKEN_PROGRAM_ADDRESS
} from "@solana-program/token";
const client = await createLocalClient()
.use(tokenProgram());
const mint = await generateKeyPairSigner();
const [tokenAccount] = await findAssociatedTokenPda({
mint: mint.address,
owner: client.payer.address,
tokenProgram: TOKEN_PROGRAM_ADDRESS
});
const result = await client.token.instructions
.burnChecked({
account: tokenAccount, // Token account holding the tokens to burn.
mint: mint.address, // Mint for the token being burned.
authority: client.payer, // Owner or delegate approving the burn.
amount: 25n, // Token amount in base units.
decimals: 2 // Decimals defined on the mint account.
})
.sendTransaction();
const mintAccount = await client.token.accounts.mint.fetch(mint.address);
const tokenAccountData = await client.token.accounts.token.fetch(tokenAccount);
console.log("Mint Address:", mint.address);
console.log("Mint Account:", mintAccount.data);
console.log("\nToken Account Address:", tokenAccount);
console.log("Token Account:", tokenAccountData.data);
console.log("\nTransaction Signature:", result.context.signature);
Console
Click to execute the code.

Web3.js

import { Connection, Keypair, LAMPORTS_PER_SOL } from "@solana/web3.js";
import {
createAssociatedTokenAccount,
burnChecked,
createMint,
getAccount,
getMint,
mintToChecked,
TOKEN_PROGRAM_ID
} from "@solana/spl-token";
const result = await burnChecked(
connection, // Connection to the local validator.
feePayer, // Account paying transaction fees.
associatedTokenAccount, // Token account holding the tokens to burn.
mintPubkey, // Mint for the token being burned.
feePayer, // Owner or delegate approving the burn.
25, // Token amount in base units.
2, // Decimals defined on the mint account.
[], // Additional multisig signers.
{
commitment: "confirmed" // Confirmation options for the transaction.
},
TOKEN_PROGRAM_ID // Token program to invoke.
);
const mintAccount = await getMint(
connection,
mintPubkey,
"confirmed",
TOKEN_PROGRAM_ID
);
const tokenAccountData = await getAccount(
connection,
associatedTokenAccount,
"confirmed",
TOKEN_PROGRAM_ID
);
console.log("Mint Address:", mintPubkey.toBase58());
console.log("Mint Account:", mintAccount);
console.log(
"\nAssociated Token Account Address:",
associatedTokenAccount.toBase58()
);
console.log("Associated Token Account:", tokenAccountData);
console.log("\nTransaction Signature:", result);
Console
Click to execute the code.

Rust

Rust
use anyhow::Result;
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_commitment_config::CommitmentConfig;
use solana_sdk::{
program_pack::Pack,
signature::{Keypair, Signer},
transaction::Transaction,
};
use solana_system_interface::instruction::create_account;
use spl_associated_token_account_interface::{
address::get_associated_token_address, instruction::create_associated_token_account,
};
use spl_token_interface::{
id as token_program_id,
instruction::{burn_checked, initialize_mint, mint_to_checked},
state::{Account, Mint},
};
#[tokio::main]
async fn main() -> Result<()> {
let client = RpcClient::new_with_commitment(
String::from("http://localhost:8899"),
CommitmentConfig::confirmed(),
);
let burn_amount = 25;
let transaction = Transaction::new_signed_with_payer(
&[
burn_checked(
&token_program_id(), // Token program to invoke.
&associated_token_address, // Token account holding the tokens to burn.
&mint.pubkey(), // Mint for the token being burned.
&fee_payer.pubkey(), // Owner or delegate approving the burn.
&[], // Additional multisig signers.
burn_amount, // Token amount in base units.
decimals, // Decimals defined on the mint account.
)?,
],
Some(&fee_payer.pubkey()),
&[&fee_payer],
latest_blockhash,
);
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
let mint_account = client.get_account(&mint.pubkey()).await?;
let mint_data = Mint::unpack(&mint_account.data)?;
let token_account = client.get_account(&associated_token_address).await?;
let token_data = Account::unpack(&token_account.data)?;
println!("Mint Address: {}", mint.pubkey());
println!("Mint Account: {:#?}", mint_data);
println!(
"\nAssociated Token Account Address: {}",
associated_token_address
);
println!("Associated Token Account: {:#?}", token_data);
println!("\nTransaction Signature: {}", transaction_signature);
Ok(())
}
Console
Click to execute the code.

Python

Python
#!/usr/bin/env python3
import asyncio
import json
from solana.rpc.async_api import AsyncClient
from solders.keypair import Keypair
from solders.message import Message
from solders.pubkey import Pubkey
from solders.system_program import create_account, CreateAccountParams
from solders.transaction import Transaction
from spl.token.async_client import AsyncToken
from spl.token.instructions import (
burn_checked,
BurnCheckedParams,
create_associated_token_account,
get_associated_token_address,
initialize_mint,
InitializeMintParams,
mint_to_checked,
MintToCheckedParams,
)
from spl.token.constants import MINT_LEN, TOKEN_PROGRAM_ID
DECIMALS = 2
AMOUNT_TO_MINT = 100
AMOUNT_TO_BURN = 25
async def main():
rpc = AsyncClient("http://localhost:8899")
async with rpc:
burn_tokens_instruction = burn_checked(
BurnCheckedParams(
program_id=TOKEN_PROGRAM_ID, # Token program to invoke.
mint=mint.pubkey(), # Mint for the token being burned.
account=token_account_address, # Token account whose balance decreases.
owner=fee_payer.pubkey(), # Account that owns the token account and signs the transaction.
amount=AMOUNT_TO_BURN, # Token amount in base units.
decimals=DECIMALS, # Decimals defined on the mint account.
)
)
latest_blockhash = await rpc.get_latest_blockhash()
transaction = Transaction(
[fee_payer],
Message([burn_tokens_instruction], fee_payer.pubkey()),
latest_blockhash.value.blockhash,
)
result = await rpc.send_transaction(transaction)
mint_info = await token.get_mint_info()
token_account_info = await token.get_account_info(token_account_address)
mint_account = {
key: str(value) if isinstance(value, Pubkey) else value
for key, value in mint_info._asdict().items()
}
token_account = {
key: str(value) if isinstance(value, Pubkey) else value
for key, value in token_account_info._asdict().items()
}
print("Mint Address:", mint.pubkey())
print("Mint Account:")
print(json.dumps(mint_account, indent=2))
print("\nToken Account Address:", token_account_address)
print("Token Account:")
print(json.dumps(token_account, indent=2))
print("\nTransaction Signature:", result.value)
if __name__ == "__main__":
asyncio.run(main())
Console
Click to execute the code.

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