Ethereum Announces Hard Fork Metropolis
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The hard fork may occur at block 4.3 million on September 22nd and worst case is block 4.4 million which would take place on October 27th.
The following changes may occur.
More Predictable Gas Charges
On the Ethereum blockchain, operations performed by a transaction or contract have an associated cost to perform those actions based upon the computational complexity of the operation. Currently developers, or users, must manage the gas limits for their transactions which leads to some unpredictable results. This has become even more problematic during times of high network activity, including during Initial Coin Offerings (ICOs).
With Metropolis, gas charges will be calculated automatically, at the time of the transaction, taking into account the current state of the network. This will increase the predictability of transactions being processed, especially during higher-volume periods.
Increase anonymity
Zero-knowledge proofs, or zk-SNARKs, are expected which will enable users to perform transactions with more anonymity than what has been afforded in the past. As the Ethereum blockchain is a public chain, there may be some details of a transaction that counter parties may not want to be visible to the public. Using zk-SNARKS allows only intended audiences with the ability to view data that is privy to them. Dr. Christian Reitwiessner, a team lead at Ethereum and creator of Solidity, describes zk-SNARKs as a way to verify the correctness of computations without having to execute them and you will not even learn what was executed – just that it was done correctly.
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