Demystified Ethereum {ETH} 2.0 Terms

Serenity or Ethereum 2.0 is the long-awaited and even longer movement of the Ethereum network from the work test (PoW) to the participation test (PoS), along with some huge improvements on the scalability side. An important milestone in this has been the freezing of the specifications of the first phase of development and now we can begin to see the results of the incredible amount of hard work that was put into research.

When I started looking at Serenity (or Ethereum 2.0) the first thing that made me feel lost was the abundance of completely new terms. What the heck is a cross-link? Is it a slot, a block? [Spoiler, no, it isn’t]. Is a certifier the same as a validator?

The following list tries to describe the most used terms in the Ethereum 2.0 universe for the slightly technical user. Keep in mind that this is not an exhaustive list, but focuses on the most prominent details you might have questions about.

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Beacon Chain
Among its characteristics, they emphasize that it is a chain for the governance of everything, it works with a proof of participation and includes blocks called Beacon. It is the consensus layer for everything: it manages validators, applies rewards and penalties, it serves as an anchor point for the fragments through cross-links.

Shards
There are 1024 of them, semi-independent chains, including fragment blocks. Periodically the state of the fragment blocks is recorded in the beacon chain through cross-links. Once a block in the beacon chain is finalized, the blocks of fragments referred to in the included cross-links are considered finalized and each fragment has a committee of validators that certify blocks.

Crosslinks
It is a summary of the state of the fragment and only reference of the fragments in the Beacon chain.

Slot
Period of time in which a block proposer proposes a block for certification. The slots may be…

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