- Monero has released FCMP++ and CARROT alpha stressnet v1.5 to reduce memory usage and improve node synchronization performance.
- FCMP++ aims to scale the anonymity set from 16 per input to 100 million outputs across the chain.
Monero’s planned privacy upgrades are progressing as developers continue testing Full-Chain Membership Proofs (FCMP++) in parallel with CARROT integration. Monero said development is progressing smoothly. quotation the release of new Alpha Stressnet software versions and the continued preparation of Beta Stressnet and audits related to CARROT;
FCMP++ is designed to replace Monero’s current ring signature model with a new proof system that extends the anonymity set on each transaction input. In the existing structure, expenditures are proven within a limited range of outcomes. FCMP++ allows the output used to be blockchain.
Development of Full-Chain Membership Proofs (FCMP++) and CARROT is progressing well, with new versions of the Alpha Stressnet software being released and developers planning to audit the Beta Stressnet and CARROT integration.
“Proof of full chain membership proves the results spent… https://t.co/f1s8FvJsaV
— Monero (XMR) (@monero) January 19, 2026
Monero said this approach moves each input from an immediate anonymity set of 16 to up to 100 million, addressing the privacy risks associated with small anonymity pools.
Latest milestones include the pre-release of FCMP++ and CARROT alpha stressnet v1.5 published in version v0.19.0.0-alpha.1.5. This release aims to improve stability during testing, and the developers say it reduces out-of-memory failures and introduces multiple performance upgrades.
Changes are focused on reducing the memory footprint of FCMP++ validation, improving multi-threaded synchronization, and adjusting how nodes download blocks during synchronization based on real-time performance.
Monero’s Alpha Stressnet v1.5 improves FCMP++ verification and synchronization performance
According to the release notes, v1.5 also includes changes to avoid chain download overloads, fix synchronization state issues when the transaction pool is full, and improve connection stability during network synchronization.
The developers also introduced optimizations that speed up verification by changing when certain data points are decompressed and adjusting proof calculations.
Wallet-related updates are also included to support stressnet testing. These changes fix false positives when receiving CARROT transactions. It also improves input selection rules when building transactions. Additionally, the wallet now excludes zero amount CARROT output from some transfer reports. The developers also addressed rare cases where key image tracking could cause unexpected double-spend errors.
Stressnet itself was created as a public test environment, hard forked From the existing Monero testnet on October 3, 2025, block 2,847,330. This is intended to provide developers and community testers with a live network to evaluate the combined FCMP++ and CARROT integration before considering deployment steps.
developer of Privacy-focused network We warn that Stressnet is still alpha software and may contain bugs. It also pointed out that some features are not yet supported, such as hardware wallets, multisig, watch-only wallets, transaction proofs, and block explorers.
The development team encouraged testers to report issues in detail to improve preparation ahead of the planned beta phase and audit efforts.
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