Currently, networks of computers called "miners" select transactions from a particular data pool and group them into blocks that are then added to the blockchain.
The elimination of the miners is a component of a strategy to cut back on energy usage.
The builders will compile transactions into blocks following the upcoming "Merge" upgrade in September, which they will then send to the validators.
The order of the blocks that make up the upgraded blockchain will be approved by the validators.
This ostensibly geeky change, which is a component of the MEV-Boost software upgrade, may, at least initially, make Ethereum more centralized.
Only a small number of participants have committed to acting as builders, despite the fact that there are currently over 416,000 validators waiting in line to order transactions.
The biggest manufacturer of open-source software used by trading bots is Flashbots.
By allowing their transactions to be front-ran and otherwise getting around others, flashbots have already become the main method used by miners to extort fees from traders.
Because they are worried that Flashbots or other similar entities will have too much control, other participants are thinking about becoming builders.
According to Uri Klarman, CEO of BloXroute Labs, which operates a network of servers that enables traders to send transactions to miners more quickly, "it kills decentralization."
According to him, the network processes about 40% of all trading activity from decentralized finance apps that enable coin lending, borrowing, and trading.
One danger, according to Klarman, is that a potent digital wallet like MetaMask, which enables users to buy, sell, and receive cryptocurrency, could end up acting as a "king maker."
According to Klarman, a wallet service could choose to favor one builder over all others or even decide to take on the role of a builder, controlling the flow of transactions.
ConsenSys, based in New York and founded by Ethereum co-founder Joseph Lubin, is the company that owns MetaMask. The software company downplays the issue.
The global product lead at MetaMask, Taylor Monahan, stated that the company "will never send all of MetaMask's transactions to one specific builder or provider."
"Being a portal to an exciting, vibrant, diverse, and equitable ecosystem, MetaMask derives its value.
Because of this, MetaMask will constantly work to make decisions that support a strong and decentralized Ethereum.
The builder-validator role separation was initially intended to reduce the power of validators and increase Ethereum's decentralization.
However, there could be problems if there aren't enough builders on the upgraded Ethereum chain.
They might prevent certain transactions from being added to blocks.
After the US Treasury Department approved the mixer protocol earlier this month, Flashbots blacklisted Tornado Cash wallets.
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