0xfnzero
73 lines
2.3 KiB
Markdown
73 lines
2.3 KiB
Markdown
# Durable Nonce Guide
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This guide explains how to use Durable Nonce in Sol Trade SDK to implement transaction replay protection and optimize transaction processing.
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## 📋 What is Durable Nonce?
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Durable Nonce is a Solana feature that allows you to create transactions that remain valid for extended periods, beyond the 150-block limitation of recent block hashes.
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## 🚀 Core Benefits
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- **Transaction Replay Protection**: Prevents identical transactions from being executed multiple times
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- **Extended Time Window**: Transactions can remain valid for longer periods
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- **Network Performance Optimization**: Reduces dependency on the latest block hash
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- **Transaction Determinism**: Provides consistent transaction processing experience
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- **Offline Transaction Support**: Supports offline processing of pre-signed transactions
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## 🛠️ Implementation
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### Prerequisites:
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You need to create a nonce account for your payer account first.
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Reference: https://solana.com/developers/guides/advanced/introduction-to-durable-nonces
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### 1. Fetch Nonce Information
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Directly fetch nonce information from RPC:
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```rust
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use sol_trade_sdk::common::nonce_cache::fetch_nonce_info;
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use solana_sdk::pubkey::Pubkey;
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use std::str::FromStr;
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// Set up nonce account
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let nonce_account = Pubkey::from_str("your_nonce_account_address_here")?;
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// Fetch nonce information
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let durable_nonce = fetch_nonce_info(&client.rpc, nonce_account).await;
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```
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### 2. Use Nonce in Transactions
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Set nonce parameters: durable_nonce
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```rust
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let buy_params = sol_trade_sdk::TradeBuyParams {
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dex_type: DexType::PumpFun,
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mint: mint_pubkey,
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sol_amount: buy_sol_amount,
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slippage_basis_points: Some(100),
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recent_blockhash: Some(recent_blockhash),
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extension_params: Box::new(PumpFunParams::from_trade(&trade_info, None)),
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wait_transaction_confirmed: true,
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create_wsol_ata: false,
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close_wsol_ata: false,
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create_mint_ata: true,
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open_seed_optimize: false,
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durable_nonce: durable_nonce, // Set durable nonce
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};
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// Execute transaction
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client.buy(buy_params).await?;
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```
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## 🔄 Nonce Usage Flow
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1. **Fetch**: Get the latest nonce value from RPC
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2. **Use**: Set nonce parameters in transactions
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3. **Refresh**: Call `fetch_nonce_info` again before next use to get new nonce value
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## 🔗 Related Documentation
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- [Example: Durable Nonce](../examples/nonce_cache/)
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