Quemar tokens

¿Qué Hace la Quema?

Quemar tokens disminuye permanentemente el saldo de una token account y reduce el suministro total del mint en la misma cantidad.

Cómo Quemar Tokens

Quemar tokens utiliza la instrucción Burn o BurnChecked del Token Program.

Los ejemplos a continuación utilizan BurnChecked, que requiere que el llamador proporcione los decimales del mint para que la instrucción pueda verificar la precisión esperada del token antes de quemar.

El native mint no admite la quema. Utiliza CloseAccount en su lugar.

El propietario de la token account o un delegado aprobado firma la transacción. En el Token Extensions Program, un delegado permanente del mint también puede autorizar la quema si el mint tiene habilitada la extensión de delegado permanente.

Referencia de Código

ElementoDescripciónToken ProgramToken Extensions Program
MintEl estado del mint almacena el suministro total de tokens.CódigoCódigo
AccountEl estado de la token account almacena el saldo de tokens reducido por una quema.CódigoCódigo
BurnUna instrucción de quema que disminuye el saldo de una token account y el suministro del mint sin requerir que el llamador proporcione los decimales del mint.CódigoCódigo
BurnCheckedUna instrucción de quema que requiere que el llamador proporcione los decimales del mint y verifica ese valor antes de disminuir el saldo de una token account y el suministro del mint.CódigoCódigo
process_burnLógica de procesamiento compartida para quemas de tokens.CódigoCódigo

Typescript

Los ejemplos a continuación muestran el enfoque recomendado usando Kit. Los ejemplos heredados usando @solana/kit se incluyen como referencia.

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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