It's the duration of two consecutive blocks, under ethereum blockchain, time is divided into 12 second units, called slots. In each slot, a validator is going to be selected to propose a block. Case all the validator are functioning properly online a new block will be propose in each slot, Otherwise, there will be empty slots.

Ethereum Block Time

Blocks in Ethereum have a maximum size limit, which is set at 15 million gas, but can adjust to network demands up to a maximum of 30 million gas. All transactions included in a block must consume less gas than the block gas limit. This ensures that blocks cannot become too large, which would make it difficult for less powerful full nodes to keep up with the network. 

Ethereum Block Size

Ethereum supports Proof of Stake and uses validators instead of miners, blocks are randomly selected by a validator to propagare this block to the network and consequently add it to the network through the assembly process. Unlike other blockchain, Blocks support of creation of smart contracts using a system of gas for the execution of them.

University of Michigan - Ann Arbor

Ethereum is alternative protocol to Bitcoin for building decentralized applications.   

It is open-source, has smart-contract functionality, and allows users to create their own arbitrary rules for ownership, transaction formats and state transition functions.

Ethereum

Blocks are files that store data on the blockchain by recording the updated data of transactions and storing that data on a digital ledger. Blocks hold encrypted data, and in order to identity a particular block the information from previous blocks as well as data from transactions are used. 

Blocks

- [Ethereum Governance](https://ethereum.org/en/governance/)

Ethereum org

- Ethereum Accounts
- Transactions
- Messages
- Ethereum State Transition Function
- Code Execution
- Blockchain and Mining
- Ethereum's Functionality
- Ethereum's Design

Key Ethereum Terms

- Token Systems
- Financial derivatives and Stable-Value Currencies
- Identity and Reputation Systems
- Decentralized File Storage
- Decentralized Autonomous Organizations
- Further Applications


Ethereum Applications

- Modified GHOST Implementation
- Fees
- Computation and Turing-Completeness
- Currency and Issuance
- Mining Centralization
- Scalability


Ethereum Concerns

- Ethereum Whitepaper
- Ethereum Name Service (ENS)
- Go-Ethereum for electronic voting system using clique as proof-of-authority

Ethereum References

The Ethereum governance refers to the way and process to make changes to the protocol, this protocol isn't controlled by someone. Therefore, decisions under the protocol are extremely important since so many people and project depends on it, that's why either decision making or core changes, this process considers social and technical criteria and it's also supported totally by the community.

Ethereum Governance

Is an updated version of the Ethereum network that aims to improve several features of the existing network
Some of the features of Ethereum 2.0 include:
- **Proof of Stake**: replaces *Proof of Work*
- **Sharding**.
- **Virtual Machine Update**.
- **Scalability**.
- **Security**.

Ethereum 2.0

Ether is the native cryptocurrency used fundamentally for payment transaction fees on the Ethereum network, then after the **Merge** it's also used for validate and propose blocks on Mainnet. The pricing mechanism for Ethereum's computing power is facilitated by the ether cryptocurrency. In order for transactions to be validated on the blockchain, users are required to pay ether, known as gas fees, which depends on computing power required for running a transaction


Ether (ETH)

Ethereum Blocks

It's the runtime Environment for executing smart contracts and running transaction on the Ethereum Virtual Machine, designed to be Turing Complete, which means the EVM can run any program given enough resources. It allows developers to write and deploy smart contracts than are self-executing based on the agreement reached by the user.
The EVM exist as a single entity maintained by thousand of connected computers running an Ethereum Client software.

Ethereum Virtual Machine (EVM)

A Ethereum node is a device that is connected to the Ethereum network and helps maintain the network by validating transactions and blocks. A node can be any device, such as a personal computer, a server, or a mobile device, that runs **Ethereum client** software and connects to the Ethereum network.

Ethereum Node

Transactions are grouped into blocks and the system works to make the block's hash contain a certain number of leading zero bits. Once a proof-of-work is completed, a block cannot be changed unless the work is redone. As more blocks are added to the chain, changing the block would require redoing the work for all the following blocks too. A result of this system is that the network accepts the longest chain as the legitimate chain.

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