Wat Doet Verbranden?
Het verbranden van tokens verlaagt permanent het saldo van een token account en vermindert het totale aanbod van de mint met hetzelfde bedrag.
Hoe Tokens te Verbranden
Het verbranden van tokens maakt gebruik van de Burn of BurnChecked
instructie van het Token Program.
De onderstaande voorbeelden gebruiken BurnChecked, waarbij de aanroeper de
decimalen van de mint moet opgeven zodat de instructie de verwachte
tokenprecisie kan verifiëren voordat deze verbrand wordt.
De native mint ondersteunt geen verbranding.
Gebruik in plaats daarvan CloseAccount.
De eigenaar van het token account of een goedgekeurde gemachtigde ondertekent de transactie. In het Token Extensions Program kan een permanente mint-gemachtigde de verbranding ook autoriseren als de mint de permanente gemachtigde-extensie heeft ingeschakeld.
Bronverwijzing
| Item | Beschrijving | Token Program | Token Extensions Program |
|---|---|---|---|
Mint | De mint-status slaat het totale tokenaanbod op. | Bron | Bron |
Account | De token account-status slaat het tokensaldo op dat door een verbranding wordt verlaagd. | Bron | Bron |
Burn | Een verbrandingsinstructie die een token account-saldo en mint-aanbod verlaagt zonder dat de aanroeper de decimalen van de mint hoeft op te geven. | Bron | Bron |
BurnChecked | Een verbrandingsinstructie waarbij de aanroeper de decimalen van de mint moet opgeven en die waarde controleert voordat een token account-saldo en mint-aanbod wordt verlaagd. | Bron | Bron |
process_burn | Gedeelde processorlogica voor tokenverbrandingen. | Bron | Bron |
Typescript
De onderstaande voorbeelden met Kit tonen de aanbevolen aanpak met
@solana/kit. Verouderde voorbeelden met @solana/web3.js zijn ter referentie
opgenomen.
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);
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);
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(())}
Python
#!/usr/bin/env python3import asyncioimport jsonfrom solana.rpc.async_api import AsyncClientfrom solders.keypair import Keypairfrom solders.message import Messagefrom solders.pubkey import Pubkeyfrom solders.system_program import create_account, CreateAccountParamsfrom solders.transaction import Transactionfrom spl.token.async_client import AsyncTokenfrom 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_IDDECIMALS = 2AMOUNT_TO_MINT = 100AMOUNT_TO_BURN = 25async 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 valuefor key, value in mint_info._asdict().items()}token_account = {key: str(value) if isinstance(value, Pubkey) else valuefor 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())
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