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first_img Bitcoin Core 32 enters final testing, optimizing transaction fee estimation and block processing

According to CoinDesk, Bitcoin Core 32 entered its final testing phase on September 14, with the first candidate version marked, and the official release is expected on October 10. This version will not change Bitcoin's consensus rules but will mainly optimize fee estimation, accelerate block processing, and fix several security vulnerabilities.In terms of fee estimation, Bitcoin Core 32 introduces a new estimator based on unconfirmed transactions, which can quickly lower the recommended fee rate when network congestion eases, compared to the original estimator based on historical block fees. Regarding block processing, nodes can now use multiple threads to fetch transaction data from the database simultaneously, with a default of 8 threads, reducing the waiting time for nodes to catch up with the blockchain.For security fixes, developers have addressed a command execution vulnerability that has existed in non-Windows systems since Bitcoin Core 24. This vulnerability could allow authenticated users to execute commands on the node host through specially crafted wallet names when the walletnotify feature is enabled. Additionally, four commands used to create partially signed transactions will default to using PSBT version 2 format; the new web server was found to have a memory exhaustion flaw during auditing, where 16 unauthenticated REST connections could raise the node's memory from 46 MB to about 3 GB in approximately one minute, and this issue has been fixed before the official release.

first_img Uniswap launched StablePair Hook, a dynamic fee rate to help LP capture the value of stablecoin transactions

According to The Block, Uniswap Labs announced the launch of a new tool, StablePair Hook, designed specifically for stablecoin trading pairs such as USDC/USDT and USDC/USDG.Uniswap Labs stated that StablePair Hook can provide traders with consistent and predictable quotes, allowing liquidity providers to retain more of the value they create. Data shows that in the second quarter, the trading volume of exchanges between stablecoins on Uniswap reached $43.4 billion, surpassing the total of the other three major on-chain trading venues.StablePair Hook replaces fixed rates with dynamic rates, which adjust based on the degree of price deviation from the reference price within the pool. When the price is close to the reference price, the Hook adjusts the transaction fee for each trade to maintain a fixed bid-ask spread; when the price deviates from the reference range, trades that push the price away incur no fees, while trades that pull the price back to the reference price use a Dutch auction mechanism, with fees decreasing block by block from high to low until accepted by the trader. Uniswap Labs stated that this allows liquidity providers to retain more value from price returns.The first batch of StablePair Hook pools will go live on Ethereum, supporting USDC/USDG and USDC/USDT trading pairs. This Hook can be upgraded through Uniswap governance, and the fee system and other parameters can be adjusted without migrating liquidity.

Circle launched the CCTP rapid transfer prepayment fee model

According to official news, the Circle Cross-Chain Transfer Protocol (CCTP) now supports a fast transfer prepayment fee feature. Previously, the protocol fee would be directly deducted from the USDC transfer amount on the target chain; with this update, developers can pre-quote and collect fees using the native Gas token or USDC from the source chain before executing the transfer, thereby simplifying the fee handling for cross-chain transfers and ensuring that users receive the expected amount of USDC.It is reported that the prepayment fee mechanism mainly improves the predictability of fees in cross-chain applications. Users do not have to bear the reduction in the actual amount received due to additional deductions on the target chain; at the same time, the CCTP Quote API can uniformly calculate fees for different supported chains and integrate Fast Transfer and Forwarding fees into a single quote, so developers do not need to build systems to separately calculate multiple protocol fees. In addition, fees can be paid directly using the native token of the source chain, which will not reduce or affect the actual transferred USDC balance.Currently, the prepayment fee feature supports USDC transfers on all EVM chains covered by CCTP, but it does not support transfers initiated from Solana; transfers to Solana are still supported. Developers can obtain specific fee quotes through the Quote API and integrate this feature, and relevant developers can refer to the CCTP official documentation to build a more predictable cross-chain USDC transfer process.
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