Token Yatırma

Tokenleri gizli bekleyen bakiyeye nasıl yatırılır

Tokenler gizli olarak transfer edilmeden önce, açık token bakiyesinin gizli bakiyeye dönüştürülmesi gerekir. Bu dönüşüm iki aşamada gerçekleşir:

  1. Gizli Bekleyen Bakiye: Başlangıçta, tokenler açık bakiyeden "bekleyen" gizli bakiyeye "yatırılır".
  2. Gizli Kullanılabilir Bakiye: Bekleyen bakiye daha sonra kullanılabilir bakiyeye "uygulanır", böylece tokenler gizli transferler için kullanılabilir hale gelir.

Bu bölüm, ilk aşamayı açıklar: açık token bakiyesini gizli bekleyen bakiyeye yatırma.

Aşağıdaki diyagram, tokenleri açık bakiyeden gizli bekleyen bakiyeye yatırma adımlarını göstermektedir:

Deposit Tokens

Gerekli Talimat

Açık bakiyeyi gizli bekleyen bakiyeye dönüştürmek için ConfidentialTransferInstruction::Deposit talimatını çağırın. Her yatırma talimatı başına maksimum miktar 2^48 ile sınırlıdır.

spl_token_client paketi, aşağıdaki örnekte gösterildiği gibi Deposit talimatı içeren bir işlem oluşturup gönderen bir confidential_transfer_deposit metodu sağlar.

Örnek Kod

Aşağıdaki örnek, açık token bakiyesini gizli bekleyen bakiyeye nasıl yatıracağınızı göstermektedir.

Örneği çalıştırmak için, aşağıdaki komutu kullanarak ana ağdan klonlanmış Token Extensions Program ile yerel bir validator başlatın. Yerel validator'ı başlatmak için Solana CLI'nin kurulu olması gerekir.

Terminal
$
solana-test-validator --clone-upgradeable-program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb --url https://api.mainnet-beta.solana.com -r

Bu yazının yazıldığı sırada, Gizli Transferler varsayılan yerel validator'da etkinleştirilmemiştir. Örnek kodu çalıştırmak için ana ağdan Token Extensions Program'ı klonlamanız gerekir.

use anyhow::{Context, Result};
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_sdk::{
commitment_config::CommitmentConfig,
signature::{Keypair, Signer},
transaction::Transaction,
};
use spl_associated_token_account::{
get_associated_token_address_with_program_id, instruction::create_associated_token_account,
};
use spl_token_client::{
client::{ProgramRpcClient, ProgramRpcClientSendTransaction},
spl_token_2022::{
extension::{
confidential_transfer::instruction::{configure_account, PubkeyValidityProofData},
ExtensionType,
},
id as token_2022_program_id,
instruction::reallocate,
solana_zk_sdk::encryption::{auth_encryption::*, elgamal::*},
},
token::{ExtensionInitializationParams, Token},
};
use spl_token_confidential_transfer_proof_extraction::instruction::{ProofData, ProofLocation};
use std::sync::Arc;
#[tokio::main]
async fn main() -> Result<()> {
// Create connection to local test validator
let rpc_client = Arc::new(RpcClient::new_with_commitment(
String::from("http://localhost:8899"),
CommitmentConfig::confirmed(),
));
// Load the default Solana CLI keypair to use as the fee payer
// This will be the wallet paying for the transaction fees
// Use Arc to prevent multiple clones of the keypair
let payer = Arc::new(load_keypair()?);
println!("Using payer: {}", payer.pubkey());
// Generate a new keypair to use as the address of the token mint
let mint = Keypair::new();
println!("Mint keypair generated: {}", mint.pubkey());
// Set up program client for Token client
let program_client = ProgramRpcClient::new(rpc_client.clone(), ProgramRpcClientSendTransaction);
// Number of decimals for the mint
let decimals = 9;
// Create a token client for the Token-2022 program
// This provides high-level methods for token operations
let token = Token::new(
Arc::new(program_client),
&token_2022_program_id(), // Use the Token-2022 program (newer version with extensions)
&mint.pubkey(), // Address of the new token mint
Some(decimals), // Number of decimal places
payer.clone(), // Fee payer for transactions
);
// Create extension initialization parameters for the mint
// The ConfidentialTransferMint extension enables confidential (private) transfers of tokens
let extension_initialization_params =
vec![ExtensionInitializationParams::ConfidentialTransferMint {
authority: Some(payer.pubkey()), // Authority that can modify confidential transfer settings
auto_approve_new_accounts: true, // Automatically approve new confidential accounts
auditor_elgamal_pubkey: None, // Optional auditor ElGamal public key
}];
// Create and initialize the mint with the ConfidentialTransferMint extension
// This sends a transaction to create the new token mint
let transaction_signature = token
.create_mint(
&payer.pubkey(), // Mint authority - can mint new tokens
Some(&payer.pubkey()), // Freeze authority - can freeze token accounts
extension_initialization_params, // Add the ConfidentialTransferMint extension
&[&mint], // Mint keypair needed as signer
)
.await?;
// Print results for user verification
println!("Mint Address: {}", mint.pubkey());
println!(
"Mint Creation Transaction Signature: {}",
transaction_signature
);
// ===== Create and configure token account for confidential transfers =====
println!("\nCreate and configure token account for confidential transfers");
// Get the associated token account address for the owner
let token_account_pubkey = get_associated_token_address_with_program_id(
&payer.pubkey(), // Token account owner
&mint.pubkey(), // Mint
&token_2022_program_id(), // Token program ID
);
println!("Token Account Address: {}", token_account_pubkey);
// Step 1: Create the associated token account
let create_associated_token_account_instruction = create_associated_token_account(
&payer.pubkey(), // Funding account
&payer.pubkey(), // Token account owner
&mint.pubkey(), // Mint
&token_2022_program_id(), // Token program ID
);
// Step 2: Reallocate the token account to include space for the ConfidentialTransferAccount extension
let reallocate_instruction = reallocate(
&token_2022_program_id(), // Token program ID
&token_account_pubkey, // Token account
&payer.pubkey(), // Payer
&payer.pubkey(), // Token account owner
&[&payer.pubkey()], // Signers
&[ExtensionType::ConfidentialTransferAccount], // Extension to reallocate space for
)?;
// Step 3: Generate the ElGamal keypair and AES key for token account
let elgamal_keypair = ElGamalKeypair::new_from_signer(&payer, &token_account_pubkey.to_bytes())
.expect("Failed to create ElGamal keypair");
let aes_key = AeKey::new_from_signer(&payer, &token_account_pubkey.to_bytes())
.expect("Failed to create AES key");
// The maximum number of Deposit and Transfer instructions that can
// credit pending_balance before the ApplyPendingBalance instruction is executed
let maximum_pending_balance_credit_counter = 65536;
// Initial token balance is 0
let decryptable_balance = aes_key.encrypt(0);
// Generate the proof data client-side
let proof_data = PubkeyValidityProofData::new(&elgamal_keypair)
.map_err(|_| anyhow::anyhow!("Failed to generate proof data"))?;
// Indicate that proof is included in the same transaction
let proof_location =
ProofLocation::InstructionOffset(1.try_into()?, ProofData::InstructionData(&proof_data));
// Step 4: Create instructions to configure the account for confidential transfers
let configure_account_instructions = configure_account(
&token_2022_program_id(), // Program ID
&token_account_pubkey, // Token account
&mint.pubkey(), // Mint
&decryptable_balance.into(), // Initial balance
maximum_pending_balance_credit_counter, // Maximum pending balance credit counter
&payer.pubkey(), // Token Account Owner
&[], // Additional signers
proof_location, // Proof location
)?;
// Combine all instructions
let mut instructions = vec![
create_associated_token_account_instruction,
reallocate_instruction,
];
instructions.extend(configure_account_instructions);
// Create and send the transaction
let recent_blockhash = rpc_client.get_latest_blockhash().await?;
let transaction = Transaction::new_signed_with_payer(
&instructions,
Some(&payer.pubkey()),
&[&*payer],
recent_blockhash,
);
let setup_signature = rpc_client
.send_and_confirm_transaction(&transaction)
.await?;
println!(
"Create Token Account Transaction Signature: {}",
setup_signature
);
// Mint some tokens to the newly created token account
// This gives the account some tokens to work with
let mint_signature = token
.mint_to(
&token_account_pubkey, // Destination account
&payer.pubkey(), // Mint authority
100 * 10u64.pow(decimals as u32), // Amount (100 tokens with decimal precision)
&[&payer], // Signers
)
.await?;
println!("Mint Tokens Transaction Signature: {}", mint_signature);
// Deposit the tokens to confidential state
// This converts regular tokens to confidential tokens
println!("Deposit tokens to confidential state pending balance");
let deposit_signature = token
.confidential_transfer_deposit(
&token_account_pubkey, // The token account
&payer.pubkey(), // Authority (owner) of the account
100 * 10u64.pow(decimals as u32), // Amount to deposit (100 tokens)
decimals, // Decimals of the token
&[&payer], // Signers (owner must sign)
)
.await?;
println!(
"Confidential Transfer Deposit Signature: {}",
deposit_signature
);
Ok(())
}
// Load the keypair from the default Solana CLI keypair path (~/.config/solana/id.json)
// This enables using the same wallet as the Solana CLI tools
fn load_keypair() -> Result<Keypair> {
// Get the default keypair path
let keypair_path = dirs::home_dir()
.context("Could not find home directory")?
.join(".config/solana/id.json");
// Read the keypair file directly into bytes using serde_json
// The keypair file is a JSON array of bytes
let file = std::fs::File::open(&keypair_path)?;
let keypair_bytes: Vec<u8> = serde_json::from_reader(file)?;
// Create keypair from the loaded bytes
// This converts the byte array into a keypair
let keypair = Keypair::from_bytes(&keypair_bytes)?;
Ok(keypair)
}
Click to execute the code.

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