Τόκενς που φέρουν τόκο

Πώς να ενεργοποιήσετε το InterestBearingExtension

Το InterestBearingMintExtension σας επιτρέπει να ορίσετε ένα επιτόκιο απευθείας σε ένα mint account. Ο τόκος ανατοκίζεται συνεχώς με βάση τη χρονική σήμανση του δικτύου, αλλά το πραγματικό υπόλοιπο του token που αποθηκεύεται σε κάθε token account παραμένει αμετάβλητο. Η συνολική αξία (υπόλοιπο token + δεδουλευμένος τόκος) είναι μόνο ένας υπολογισμός. Δεν δημιουργούνται νέα tokens με αυτή την επέκταση.

Typescript

import { getCreateAccountInstruction } from "@solana-program/system";
import {
extension,
getInitializeAccountInstruction,
getInitializeMintInstruction,
getInitializeInterestBearingMintInstruction,
getMintSize,
getTokenSize,
TOKEN_2022_PROGRAM_ADDRESS
} from "@solana-program/token-2022";
import {
airdropFactory,
appendTransactionMessageInstructions,
createSolanaRpc,
createSolanaRpcSubscriptions,
createTransactionMessage,
generateKeyPairSigner,
getSignatureFromTransaction,
lamports,
pipe,
sendAndConfirmTransactionFactory,
setTransactionMessageFeePayerSigner,
setTransactionMessageLifetimeUsingBlockhash,
signTransactionMessageWithSigners
} from "@solana/kit";
// Create Connection, local validator in this example
const rpc = createSolanaRpc("http://localhost:8899");
const rpcSubscriptions = createSolanaRpcSubscriptions("ws://localhost:8900");
// Generate the authority for the mint (also acts as fee payer)
const authority = await generateKeyPairSigner();
// Fund authority/fee payer
await airdropFactory({ rpc, rpcSubscriptions })({
recipientAddress: authority.address,
lamports: lamports(5_000_000_000n), // 5 SOL
commitment: "confirmed"
});
// Generate keypair to use as address of mint
const mint = await generateKeyPairSigner();
// Define the interest bearing config extension
const interestRate = {
rate: 500 // 5.00% annualized interest (in basis points)
};
// config for interest bearing extension
const interestBearingMintExtension = extension("InterestBearingConfig", {
rateAuthority: authority.address,
initializationTimestamp: BigInt(Math.floor(new Date().getTime() / 1000)),
lastUpdateTimestamp: BigInt(Math.floor(new Date().getTime() / 1000)),
preUpdateAverageRate: interestRate.rate,
currentRate: interestRate.rate
});
// Get mint account size with interest bearing extension
const space = BigInt(getMintSize([interestBearingMintExtension]));
// Get minimum balance for rent exemption
const rent = await rpc.getMinimumBalanceForRentExemption(space).send();
// Get latest blockhash to include in transaction
const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();
// Instruction to create new account for mint (token program)
// Invokes the system program
const createMintAccountInstruction = getCreateAccountInstruction({
payer: authority,
newAccount: mint,
lamports: rent,
space,
programAddress: TOKEN_2022_PROGRAM_ADDRESS
});
// Instruction to initialize interest bearing config extension
const initializeInterestBearingConfigInstruction =
getInitializeInterestBearingMintInstruction({
mint: mint.address,
rateAuthority: authority.address,
rate: interestRate.rate // in basis points
});
// Instruction to initialize mint account data
// Invokes the token22 program
const initializeMintInstruction = getInitializeMintInstruction({
mint: mint.address,
decimals: 6,
mintAuthority: authority.address,
freezeAuthority: authority.address
});
// Generate keypair to use as address of token account
const tokenAccount = await generateKeyPairSigner();
// get token account size (with extension awareness)
const tokenAccountLen = BigInt(getTokenSize());
// Get minimum balance for rent exemption
const tokenAccountRent = await rpc
.getMinimumBalanceForRentExemption(tokenAccountLen)
.send();
// Instruction to create new account for the token account
// Invokes the system program
const createTokenAccountInstruction = getCreateAccountInstruction({
payer: authority,
newAccount: tokenAccount,
lamports: tokenAccountRent,
space: tokenAccountLen,
programAddress: TOKEN_2022_PROGRAM_ADDRESS
});
// Instruction to initialize the created token account
const initializeTokenAccountInstruction = getInitializeAccountInstruction({
account: tokenAccount.address,
mint: mint.address,
owner: authority.address
});
console.log("token account", tokenAccount.address); // ! debug
const instructions = [
createMintAccountInstruction,
initializeInterestBearingConfigInstruction,
initializeMintInstruction,
createTokenAccountInstruction,
initializeTokenAccountInstruction
];
// Create transaction message
const transactionMessage = pipe(
createTransactionMessage({ version: 0 }),
(tx) => setTransactionMessageFeePayerSigner(authority, tx),
(tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
(tx) => appendTransactionMessageInstructions(instructions, tx)
);
// Sign transaction message with all required signers
const signedTransaction =
await signTransactionMessageWithSigners(transactionMessage);
// Send and confirm transaction
await sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions })(
signedTransaction,
{ commitment: "confirmed", skipPreflight: true }
);
// Get transaction signature
const transactionSignature = getSignatureFromTransaction(signedTransaction);
console.log(
"Mint Address with Interest Bearing Extension:",
mint.address.toString()
);
console.log("Token Account:", tokenAccount.address.toString());
console.log("Interest Rate: 5% APY (500 basis points)");
console.log("Rate Authority:", authority.address.toString());
console.log("Transaction Signature:", transactionSignature);
Console
Click to execute the code.

Rust

use anyhow::Result;
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_sdk::{
commitment_config::CommitmentConfig,
program_pack::Pack,
signature::{Keypair, Signer},
system_instruction::create_account,
transaction::Transaction,
};
use spl_token_2022::{
ID as TOKEN_2022_PROGRAM_ID,
extension::{
ExtensionType,
interest_bearing_mint::instruction::initialize as initialize_interest_bearing_instruction,
},
instruction::{initialize_account, initialize_mint},
state::{Account, Mint},
};
#[tokio::main]
async fn main() -> Result<()> {
// Create connection to local validator
let client = RpcClient::new_with_commitment(
String::from("http://localhost:8899"),
CommitmentConfig::confirmed(),
);
let latest_blockhash = client.get_latest_blockhash().await?;
// Generate a new keypair for the fee payer
let fee_payer = Keypair::new();
// Airdrop 5 SOL to fee payer
let airdrop_signature = client
.request_airdrop(&fee_payer.pubkey(), 5_000_000_000)
.await?;
client.confirm_transaction(&airdrop_signature).await?;
// Ensure the airdrop is confirmed
loop {
let confirmed = client.confirm_transaction(&airdrop_signature).await?;
if confirmed {
break;
}
}
// Generate keypair to use as address of mint
let mint = Keypair::new();
// Calculate mint account size with interest bearing extension
let mint_space =
ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::InterestBearingConfig])?;
let mint_rent = client
.get_minimum_balance_for_rent_exemption(mint_space)
.await?;
// Instruction to create new account for mint (token22)
let create_mint_account_instruction = create_account(
&fee_payer.pubkey(), // payer
&mint.pubkey(), // new account (mint)
mint_rent, // lamports
mint_space as u64, // space
&TOKEN_2022_PROGRAM_ID, // program id
);
// Instruction to initialize interest bearing extension (5% APY)
let initialize_interest_bearing_instruction = initialize_interest_bearing_instruction(
&TOKEN_2022_PROGRAM_ID,
&mint.pubkey(),
Some(fee_payer.pubkey()), // rate authority
500, // interest rate (basis points) = 5%
)?;
// Instruction to initialize mint account data
let initialize_mint_instruction = initialize_mint(
&TOKEN_2022_PROGRAM_ID, // program id
&mint.pubkey(), // mint
&fee_payer.pubkey(), // mint authority
Some(&fee_payer.pubkey()), // freeze authority
9, // decimals
)?;
// Generate keypair to use as address of token account
let token_account = Keypair::new();
// Get token account size (basic)
let token_account_space = Account::LEN;
let token_account_rent = client
.get_minimum_balance_for_rent_exemption(token_account_space)
.await?;
// Instruction to create new account for token account (token22)
let create_token_account_instruction = create_account(
&fee_payer.pubkey(), // payer
&token_account.pubkey(), // new account (token account)
token_account_rent, // rent
token_account_space as u64, // space
&TOKEN_2022_PROGRAM_ID, // program id
);
// Instruction to initialize token account
let initialize_token_account_instruction = initialize_account(
&TOKEN_2022_PROGRAM_ID, // program_id
&token_account.pubkey(), // token account
&mint.pubkey(), // mint
&fee_payer.pubkey(), // authority
)?;
// Construct transaction with interest bearing mint extension
let transaction = Transaction::new_signed_with_payer(
&[
create_mint_account_instruction,
initialize_interest_bearing_instruction,
initialize_mint_instruction,
create_token_account_instruction,
initialize_token_account_instruction,
],
Some(&fee_payer.pubkey()),
&[&fee_payer, &mint, &token_account],
latest_blockhash,
);
// Send and confirm transaction
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
println!(
"Mint Address with Interest Bearing Extension: {}",
mint.pubkey()
);
println!("Token Account: {}", token_account.pubkey());
println!("Interest Rate: 5% APY (500 basis points)");
println!("Rate Authority: {}", fee_payer.pubkey());
println!("Transaction Signature: {}", transaction_signature);
Ok(())
}
Console
Click to execute the code.

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