On October 5, 2026, Monero's FCMP++ test network forked at block 3,102,800, the latest step toward what is arguably the biggest change to the coin since it launched in 2014. The question most holders are now typing into search engines is simple: what is the Monero FCMP++ release date, and does the upgrade affect the XMR they already own?
The short answer, as of early October 2026: there is no mainnet date yet, and coins on the main chain are not affected by the test fork. FCMP++ runs on a separate stress-test network called stressnet, and the switch on the main chain will only happen through a scheduled hard fork with a block height announced in advance. XMRList's FCMP++ status page explains where the rollout stands and what will change for wallets.
What is FCMP++?
FCMP++ stands for Full-Chain Membership Proofs. Today, every Monero payment is signed with a ring of 16 possible sources: the coin actually being spent plus 15 decoys pulled from the blockchain, the ring size Monero has used since its August 2022 upgrade. An outside observer cannot tell which of the 16 is real, but 16 is a small crowd, and researchers have spent years studying how decoy selection can be analyzed.
FCMP++ replaces the ring with a proof that the coin being spent is one of every output the chain has ever created. Instead of 16 candidates, an observer faces the whole history of the network. The upgrade ships together with Carrot, a new addressing scheme designed to stay compatible with existing Monero addresses.
Monero FCMP++ in numbers
From 16 to more than 150 million: the jump in possible sources per payment, from today's ring to the full set of outputs, which CryptoTicker estimated at more than 150 million on October 4, 2026.
Block 3,102,800: the height at which the FCMP++ stressnet forked on October 5, 2026.
Beta 3.0 and 3.1: developers tagged the FCMP++ and Carrot beta v3.0 build (v0.19.0.0-beta.3.0) on GitHub in late September 2026 and merged beta 3.1 on October 3.
Version 0.18.5.3: the current mainnet release, "Fluorine Fermi", which the Monero project published on October 6, 2026. It does not include FCMP++.
About $555 per XMR: Monero's price on October 7, 2026, according to CoinGecko, for a market value of about $10.4 billion and 13th place among cryptocurrencies.
When will FCMP++ launch on mainnet?
Nobody can give a firm date, and anyone who does is guessing. Monero activates protocol changes through hard forks at a block height published ahead of time, so wallets, exchanges and miners can upgrade first. The stressnet exists to find bugs before that happens. According to CryptoTicker, the beta 3.0 build added hot-cold wallet support, a second version of transaction relay and support for the RandomX v2 mining algorithm.
Past upgrades show how the process works. Release binaries normally appear weeks before a fork so services can update, and the fork height is announced on the project's official channels. While you wait, you can follow block height and current fees on a live Monero network tracker. Until an official height exists, treat any "FCMP++ launch date" on social media as rumor.
What changes for wallets, exchanges and miners
Wallets: you will need a wallet version that understands the new rules to send XMR after activation. Plan to update the official GUI or CLI wallet, Feather, Cake Wallet or your hardware wallet firmware once the fork is scheduled.
Addresses: Carrot is designed to keep existing addresses working, so you should not need to hand out new ones.
Exchanges and services: deposits and withdrawals usually pause for a short time around a hard fork while operators upgrade their nodes.
Miners: the beta builds include RandomX v2 support, so pools and mining software will need updates if it ships with the fork.
What XMR holders should do now
Nothing urgent. Coins on the main chain are untouched by the stressnet fork.
Do not send real XMR to stressnet software or addresses. Test coins there have no value.
Ignore anyone offering an FCMP++ "migration", "token swap" or "upgrade airdrop". A Monero hard fork never asks you to send coins anywhere or type your seed into a website.
Download wallet updates only from official project sites and verify the signatures or hashes.
Watch for the official fork height, then update your wallet before that block.
The bottom line
FCMP++ is the largest protocol change in Monero's history, and the October 5 stressnet fork shows it is getting closer. It is not live yet, there is no official date, and your coins are fine where they are. Follow the official announcements, update when a fork height is published, and treat every "migration" message as a scam.
Frequently Asked Questions5 FAQs
Quick answers to common questions about this topic
Not on mainnet. As of early October 2026, FCMP++ runs on a public stress-test network that forked on October 5, and the main chain still uses ring signatures with 16 members.
No mainnet date has been set. Monero will announce a hard fork block height in advance, and wallet releases with the new rules will come out before that height.
It should not. Carrot, the addressing scheme that ships with FCMP++, is designed to stay compatible with existing Monero addresses. Check your wallet's release notes when the fork is scheduled.
No. Keep your seed phrase offline and safe, and update your wallet when an official release for the fork is published. Never move coins because of an "upgrade" message.
It removes the small, fixed ring as the weak point of Monero's design. Every payment will point to the entire chain history as its possible source, which makes statistical guessing far harder and strengthens the fungibility that makes one XMR interchangeable with any other.
