Ethereum co-founder Vitalik Buterin published a plan on Monday for the first hard fork of the new Ethereum 2.0 Beacon Chain, tentatively named HF1.
The hard fork would allow the developers to introduce several key upgrades to the recently launched Beacon Chain, which would also serve as a useful test for deeper changes in the future.
The biggest practical change is the support for light clients — nodes that would have minimal resource requirements and could run on mobile devices. This would allow for “trust-minimized wallets” that are able to verify the blockchain on their own instead of relying on external service providers.
Light client support is introduced through special-purpose “sync committees,” groups of validators that are randomly assigned to create special signatures that make it easier to determine the correct version of the chain.
Other improvements include fixes to fork choice rules, where developers identified several instances of the protocol being potentially vulnerable to reorganization attacks. The issues are subtle and require precise timing, but they could have allowed malicious actors to exploit the network while controlling a small
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