Bruciare Token

Cosa Fa la Bruciatura?

La bruciatura di token riduce permanentemente il saldo di un token account e diminuisce l'offerta totale del mint dello stesso importo.

Come Bruciare Token

La bruciatura di token utilizza l'istruzione Burn o BurnChecked del Token Program.

Gli esempi seguenti utilizzano BurnChecked, che richiede al chiamante di fornire i decimali del mint affinché l'istruzione possa verificare la precisione prevista del token prima della bruciatura.

Il native mint non supporta la bruciatura. Utilizza invece CloseAccount.

Il proprietario del token account o un delegato approvato firma la transazione. Nel Token Extension Program, un permanent delegate del mint può anche autorizzare la bruciatura se il mint ha abilitato l'estensione permanent delegate.

Riferimento al Codice Sorgente

ElementoDescrizioneToken ProgramToken Extension Program
MintLo stato del mint memorizza l'offerta totale di token.SorgenteSorgente
AccountLo stato del token account memorizza il saldo dei token ridotto da una bruciatura.SorgenteSorgente
BurnUn'istruzione di bruciatura che riduce il saldo di un token account e l'offerta del mint senza richiedere al chiamante di fornire i decimali del mint.SorgenteSorgente
BurnCheckedUn'istruzione di bruciatura che richiede al chiamante di fornire i decimali del mint e verifica tale valore prima di ridurre il saldo di un token account e l'offerta del mint.SorgenteSorgente
process_burnLogica di elaborazione condivisa per le bruciature di token.SorgenteSorgente

Typescript

Gli esempi Kit di seguito mostrano l'approccio consigliato utilizzando @solana/kit. Gli esempi legacy che utilizzano @solana/web3.js sono inclusi come riferimento.

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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