Token abheben

Wie man Token aus dem vertraulichen verfügbaren Guthaben abhebt

Um Token vom vertraulichen verfügbaren Guthaben zum öffentlichen Guthaben abzuheben:

  1. Erstellen Sie zwei Nachweise clientseitig:

    Gleichheitsnachweis (CiphertextCommitmentEqualityProofData): Überprüft, ob der nach der Abhebung verbleibende Chiffretext des verfügbaren Guthabens mit dem entsprechenden Pedersen-Commitment übereinstimmt, um sicherzustellen, dass das neue verfügbare Guthaben des Kontos korrekt als remaining_balance = current_balance - withdraw_amount berechnet wird.

    Bereichsnachweis (BatchedRangeProofU64Data): Überprüft, dass das nach der Abhebung verbleibende verfügbare Guthaben nicht negativ und innerhalb eines bestimmten Bereichs liegt.

  2. Für jeden Nachweis:

    • Rufen Sie das ZK ElGamal-Nachweis-Programm auf, um die Nachweisdaten zu verifizieren.
    • Speichern Sie die nachweisspezifischen Metadaten in einem "Kontext-Zustand"-Konto, um sie in anderen Anweisungen zu verwenden.
  3. Rufen Sie die ConfidentialTransferInstruction::Withdraw Anweisung auf und stellen Sie die beiden Nachweiskonten bereit.

  4. Schließen Sie die Nachweiskonten, um das für ihre Erstellung verwendete SOL zurückzugewinnen.

Das folgende Diagramm zeigt die Schritte, die beim Abheben von Token vom vertraulichen verfügbaren Guthaben zum öffentlichen Guthaben beteiligt sind:

Withdraw Tokens

Erforderliche Anweisungen

Um Token vom vertraulichen verfügbaren Guthaben zum öffentlichen Guthaben abzuheben, müssen Sie:

  • Einen Gleichheitsnachweis und Bereichsnachweis clientseitig generieren
  • Das Zk ElGamal-Nachweis-Programm aufrufen, um die Nachweise zu verifizieren und die "Kontext-Zustand"-Konten zu initialisieren
  • Die ConfidentialTransferInstruction::Withdraw Anweisung aufrufen und die beiden Nachweiskonten bereitstellen.
  • Die beiden Nachweiskonten schließen, um die rent zurückzugewinnen.

Das spl_token_client Crate stellt die folgenden Methoden bereit:

  • confidential_transfer_create_context_state_account Methode, die ein Nachweiskonto erstellt.
  • confidential_transfer_withdraw Methode, die die Withdraw Anweisung aufruft.
  • confidential_transfer_close_context_state_account Methode, die ein Nachweiskonto schließt.

Beispielcode

Das folgende Beispiel zeigt, wie man Token vom vertraulichen verfügbaren Guthaben zum öffentlichen Guthaben abhebt.

Um das Beispiel auszuführen, starten Sie einen lokalen validator mit dem Token Extension Program, das von mainnet geklont wurde, mit dem folgenden Befehl. Sie müssen die Solana CLI installiert haben, um den lokalen validator zu starten.

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

Zum Zeitpunkt der Erstellung sind die Confidential Transfers im Standard-lokalen validator nicht aktiviert. Sie müssen das Token Extension Program von mainnet klonen, um den Beispielcode auszuführen.

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::{
account_info::WithdrawAccountInfo,
ConfidentialTransferAccount,
instruction::{configure_account, PubkeyValidityProofData},
},
BaseStateWithExtensions, 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 spl_token_confidential_transfer_proof_generation::withdraw::WithdrawProofData;
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 must be 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!(
"Token Account Setup 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!("Token Minting 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
);
// Apply the pending balance to make funds available
println!("Apply pending balance to available balance");
let apply_signature = token
.confidential_transfer_apply_pending_balance(
&token_account_pubkey, // The token account
&payer.pubkey(), // Authority (owner) of the account
None, // Optional new decryptable available balance
elgamal_keypair.secret(), // ElGamal secret key encryption
&aes_key, // AES key for encryption
&[&payer], // Signers (owner must sign)
)
.await?;
println!("Apply Pending Balance Signature: {}", apply_signature);
// ===== Withdraw half of the tokens from confidential state =====
println!("\nWithdraw tokens from confidential available balance");
// Calculate the withdraw amount (half of the deposited amount)
let withdraw_amount = 50 * 10u64.pow(decimals as u32); // Half of the 100 tokens deposited
// Get the token account data to access the confidential transfer extension
let token_account = token.get_account_info(&token_account_pubkey).await?;
// Unpack the ConfidentialTransferAccount extension portion of the token account data
let extension_data = token_account.get_extension::<ConfidentialTransferAccount>()?;
// Confidential Transfer extension information needed to construct a `Withdraw` instruction
let withdraw_account_info =
WithdrawAccountInfo::new(
extension_data,
);
// Create keypairs for the proof accounts
let equality_proof_context_state_keypair = Keypair::new();
let equality_proof_context_state_pubkey = equality_proof_context_state_keypair.pubkey();
let range_proof_context_state_keypair = Keypair::new();
let range_proof_context_state_pubkey = range_proof_context_state_keypair.pubkey();
// Create a withdraw proof data
let WithdrawProofData {
equality_proof_data,
range_proof_data,
} = withdraw_account_info.generate_proof_data(
withdraw_amount, // Amount to withdraw from confidential state
&elgamal_keypair, // ElGamal keypair for encryption
&aes_key, // AES key for encryption
)?;
// Generate the equality proof account
println!("Create equality proof context state account");
let equality_proof_signature = token
.confidential_transfer_create_context_state_account(
&equality_proof_context_state_pubkey, // Public key of the new equality proof context state account
&payer.pubkey(), // Authority that can close the context state account
&equality_proof_data, // Proof data for the equality proof verification
false, // False: combine account creation and proof verification in one transaction
&[&equality_proof_context_state_keypair], // Signer for the new account
)
.await?;
println!(
"Equality Proof Context State Account Signature: {}",
equality_proof_signature
);
// Generate the range proof account
println!("Create range proof context state account");
let range_proof_signature = token
.confidential_transfer_create_context_state_account(
&range_proof_context_state_pubkey, // Public key of the new range proof context state account
&payer.pubkey(), // Authority that can close the context state account
&range_proof_data, // Proof data for the range proof verification
true, // True: split account creation and proof verification into separate transactions (for large proofs)
&[&range_proof_context_state_keypair], // Signer for the new account
)
.await?;
println!(
"Range Proof Context State Account Signature: {}",
range_proof_signature
);
// Perform the withdrawal
println!("Execute withdrawal transaction");
let withdraw_signature = token
.confidential_transfer_withdraw(
&token_account_pubkey, // Token account to withdraw from
&payer.pubkey(), // Owner of the token account
Some(&spl_token_client::token::ProofAccount::ContextAccount(
equality_proof_context_state_pubkey, // Reference to the equality proof account
)),
Some(&spl_token_client::token::ProofAccount::ContextAccount(
range_proof_context_state_pubkey, // Reference to the range proof account
)),
withdraw_amount, // Amount to withdraw from confidential state
decimals, // Decimal precision of the token
Some(withdraw_account_info), // Data from confidential transfer extension for proof verification
&elgamal_keypair, // ElGamal keypair for encryption
&aes_key, // AES key for encryption
&[&payer], // Owner must sign the transaction
)
.await?;
println!("Withdraw Transaction Signature: {}", withdraw_signature);
// Close the context state accounts to recover rent
println!("Close equality proof context state account");
let close_equality_signature = token
.confidential_transfer_close_context_state_account(
&equality_proof_context_state_pubkey, // Equality proof context state account to close
&token_account_pubkey, // Account that will receive the lamports
&payer.pubkey(), // Authority allowed to close the account
&[&payer], // Authority must sign
)
.await?;
println!(
"Close Equality Proof Account Signature: {}",
close_equality_signature
);
println!("Close range proof context state account");
let close_range_signature = token
.confidential_transfer_close_context_state_account(
&range_proof_context_state_pubkey, // Range proof context state account to close
&token_account_pubkey, // Account that will receive the lamports
&payer.pubkey(), // Authority allowed to close the account
&[&payer], // Authority must sign
)
.await?;
println!(
"Close Range Proof Account Signature: {}",
close_range_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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