Ether.fi Requires All 12 Node Operators to Run Optimum mump2p
Ether.fi made Optimum's mump2p block-propagation software mandatory for all 12 of its node operators as the protocol launched on Ethereum mainnet. Sixteen operators with over 1.4M staked ETH now run it, but the 2.42x speed figures are Optimum's own.
Optional is over. Ether.fi now requires every one of its 12 node operators to run mump2p, the block-propagation software built by startup Optimum, after leaving it up to operators until now, according to Optimum. The mandate landed alongside Optimum's mainnet launch of the protocol on October 20, 2026.
For stakers, the pitch is simple: blocks that arrive faster can protect validator rewards. For anyone watching infrastructure risk, the story is a large liquid staking validator set standardizing on one young company's networking layer.
What mump2p does
mump2p uses Random Linear Network Coding (RLNC). Instead of shipping a block in rigid sequential pieces, the network sends mixed combinations of data, and a receiver rebuilds the original once it collects enough of them. It sits on top of libp2p and runs as a sidecar gateway next to an operator's existing setup rather than replacing it. Optimum says no changes to consensus or execution software are needed.
Sixteen Ethereum node operators now run it in production, managing over 1.4 million staked ETH and about 22,000 validator keys. Optimum puts that at more than 3% of all staked ETH and names Blockdaemon, Everstake, P2P.org, Stakefish and Bitcoin Suisse among them.
Ether.fi co-founder and chief growth officer Rok Kopp framed the decision as a high bar:
"We don't mandate new infrastructure across our entire validator set unless we're confident it raises the bar for our stakers and for the network,"
Rok Kopp, ether.fi co-founder and chief growth officer
The speed claims
Optimum says mump2p delivers blocks 2.5 to 3.5 times faster than GossipSub, Ethereum's default propagation protocol, with up to 90% of blocks accelerated. Its early mainnet measurements are more specific: 2.42x faster, arrival-time variance roughly 7.88 times lower, and mump2p users received the block first in nine of 10 measurements.
All of it is self-reported. The announcement did not explain how the data was gathered, and the same two multiples showed up in an Optimum-sponsored Four Pillars report in August that described a test across 30 gateways.
"In traditional finance, firms spend billions shaving milliseconds off execution because speed is money."
Muriel Médard, Optimum
Optimum, led by MIT professor Muriel Médard, also claims about $3.7 billion in "Total Value Boosted." That is its own metric, undefined in the announcement and not independently audited. Treat it accordingly.
Integration and access
Integration estimates vary by account: under two hours of engineering work per operator in one, one engineer and under an hour in the other, citing Optimum. Optimum says connecting is free and permissionless. In August, though, it described the network as permissioned for now, with operators connecting via an API key it issued.
Why it matters
The trade-off is concentration. As more operators route traffic through one third-party gateway, the network leans harder on a single company's software behaving correctly. A mandate across a validator set this size makes that dependency real.
Optimum raised an $11 million seed round led by 1kx in April 2025 and ran a seven-operator private testnet in June 2025. Ether.fi, which we covered securing crypto's largest ETH slashing cover with Nexus Mutual, is now adding a networking requirement to its operator stack.
The missing piece is independent latency data across varied network conditions. Until that shows up, the multiples are marketing. Optimum says it plans to take the protocol to other high-throughput chains after Ethereum.
