mump2p Launches on Ethereum as ether.fi Mandates Adoption

Optimum’s mump2p block-propagation software is now live on Ethereum mainnet. ether.fi, which previously offered mump2p as an option, now requires all 12 of its node operators to run it. In total, 16 operators are using mump2p in production, managing about 22,000 validator keys and more than 1.4 million staked ETH—over 3% of Ethereum’s total staked ether. Partners include Blockdaemon, Everstake, P2P.org, Stakefish and Bitcoin Suisse. mump2p runs as a sidecar gateway on libp2p and alongside Ethereum’s default GossipSub network, rather than replacing it. Optimum says its random linear network coding technology delivers blocks 2.42 times faster than GossipSub, with about 7.88 times less variation in arrival times; the company also reported that mump2p delivered blocks first in nine out of 10 measurements. These are company-reported results, and the announcement did not detail the testing method. Faster propagation could help validators avoid missed attestations and MEV rewards, including those operating farther from major hosting hubs. Led by MIT professor Muriel Médard, Optimum launched a private testnet in June 2025 and raised an $11 million seed round led by 1kx. It plans to expand to other high-throughput blockchains. The adoption adds to Ethereum infrastructure development, but its direct effect on ETH trading is likely limited.