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آخرین بروزرسانی صفحه: ۴ خرداد ۱۴۰۱

The history of Ethereum

A timeline of all the major milestones, forks, and updates to the Ethereum blockchain.

What are forks?

Changes to the rules of the Ethereum protocol which often include planned technical upgrades.

Forks are when major technical upgrades or changes need to be made to the network – they typically stem from Ethereum Improvement Proposals (EIPs) and change the "rules" of the protocol.

When upgrades are needed in traditional, centrally-controlled software, the company will just publish a new version for the end-user. Blockchains work differently because there is no central ownership. Ethereum clients must update their software to implement the new fork rules. Plus block creators (miners in a proof-of-work world, validators in a proof-of-stake world) and nodes must create blocks and validate against the new rules. More on consensus mechanisms

These rule changes may create a temporary split in the network. New blocks could be produced according to the new rules or the old ones. Forks are usually agreed upon ahead of time so that clients adopt the changes in unison and the fork with the upgrades becomes the main chain. However, in rare cases, disagreements over forks can cause the network to permanently split – most notably the creation of Ethereum Classic with the DAO fork.

Looking for future protocol upgrades? Learn about upcoming upgrades to Ethereum.

2021

Arrow Glacier

📆Dec-09-2021 07:55:23 PM +UTC
🧱Block number: 13,773,000
💰ETH price: $4111 USD
🖥️ ethereum.org on waybackmachine

Summary

The Arrow Glacier network upgrade pushed back the difficulty bomb by several months. This is the only change introduced in this upgrade, and is similar in nature to the Muir Glacier upgrade. Similar changes have been performed on the Byzantium, Constantinople and London network upgrades.

Arrow Glacier EIPs

Official improvements included in this upgrade.

  • EIP-4345 – delays the difficulty bomb until June 2022

🚨Node operators

Be sure to upgrade your client software to the latest version before December 5, 2021 to account for variable block times. This will help avoid having your client sync to a pre-fork chain, resulting in the inability to send funds or properly verify transactions.

Altair

📆Oct-27-2021 10:56:23 AM +UTC
🧱Epoch number: 74,240
💰ETH price: $4024 USD
🖥️ ethereum.org on waybackmachine

Summary

The Altair upgrade was the first scheduled upgrade for the Beacon Chain. It added support for "sync committees"—enabling light clients, and bringing validator inactivity and slashing penalties up to their full values.

🎉Fun fact!

Altair was the first major network upgrade that had an exact rollout time. Every upgrade prior had been based on a declared block number on the proof-of-work chain, where block times vary. The Beacon Chain does not require solving for proof-of-work, and instead works on a time-based epoch system consisting of 32 twelve-second "slots" of time where validators can propose blocks. This is why we knew exactly when we would hit epoch 74,240 and Altair became live!

London

📆 Aug-05-2021 12:33:42 PM +UTC
🧱 Block number: 12,965,000
💰 ETH price: $2621 USD
🖥️ ethereum.org on waybackmachine

Summary

The London upgrade introduced EIP-1559, which reformed the transaction fee market, along with changes to how gas refunds are handled and the Ice Age schedule.

London EIPs

Official improvements included in this upgrade.

  • EIP-1559 – improves the transaction fee market
  • EIP-3198 – returns the BASEFEE from a block
  • EIP-3529 - reduces gas refunds for EVM operations
  • EIP-3541 - prevents deploying contracts starting with 0xEF
  • EIP-3554 – delays the Ice Age until December 2021

Berlin

📆 Apr-15-2021 10:07:03 AM +UTC
🧱 Block number: 12,244,000
💰 ETH price: $2454 USD
🖥️ ethereum.org on waybackmachine

Summary

The Berlin upgrade optimized gas cost for certain EVM actions, and increases support for multiple transaction types.

Berlin EIPs

Official improvements included in this upgrade.

  • EIP-2565 – lowers ModExp gas cost
  • EIP-2718 – enables easier support for multiple transaction types
  • EIP-2929 – gas cost increases for state access opcodes
  • EIP-2930 – adds optional access lists

2020

Beacon Chain genesis

📆 Dec-01-2020 12:00:35 PM +UTC
🧱 Beacon Chain block number: 1
💰 ETH price: $586.23 USD
🖥️ ethereum.org on waybackmachine

Summary

The Beacon Chain needed 16384 deposits of 32 staked ETH to ship securely. This happened on November 27, meaning the Beacon Chain started producing blocks on December 1, 2020. This is an important first step in achieving the Ethereum vision.

Read the Ethereum Foundation announcement

📃

The Beacon Chain

Staking deposit contract deployed

📆 Oct-14-2020 09:22:52 AM +UTC
🧱 Block number: 11,052,984
💰 ETH price: $379.04 USD
🖥️ ethereum.org on waybackmachine

Summary

The staking deposit contract introduced staking to the Ethereum ecosystem. Although a Mainnet contract, it had a direct impact on the timeline for launching the Beacon Chain, an important Ethereum upgrade.

Read the Ethereum Foundation announcement

📃

Staking

Muir Glacier

📆 Jan-02-2020 08:30:49 AM +UTC
🧱 Block number: 9,200,000
💰 ETH price: $127.18 USD
🖥️ ethereum.org on waybackmachine

Summary

The Muir Glacier fork introduced a delay to the difficulty bomb. Increases in block difficulty of the proof-of-work consensus mechanism threatened to degrade the usability of Ethereum by increasing wait times for sending transactions and using dapps.

Muir Glacier EIPs

Official improvements included in this fork.

  • EIP-2384 – delays the difficulty bomb for another 4,000,000 blocks, or ~611 days.

2019

Istanbul

📆 Dec-08-2019 12:25:09 AM +UTC
🧱 Block number: 9,069,000
💰 ETH price: $151.06 USD
🖥️ ethereum.org on waybackmachine

Summary

The Istanbul fork:

  • Optimised the gas cost of certain actions in the EVM.
  • Improved denial-of-service attack resilience.
  • Made Layer 2 scaling solutions based on SNARKs and STARKs more performant.
  • Enabled Ethereum and Zcash to interoperate.
  • Allowed contracts to introduce more creative functions.

Read the Ethereum Foundation announcement

Istanbul EIPs

Official improvements included in this fork.

  • EIP-152 – allow Ethereum to work with privacy-preserving currency like Zcash.
  • EIP-1108 – cheaper cryptography to improve gas costs.
  • EIP-1344 – protects Ethereum against replay attacks by adding CHAINID opcode.
  • EIP-1884 – optimising opcode gas prices based on consumption.
  • EIP-2028 – reduces the cost of CallData to allow more data in blocks – good for Layer 2 scaling.
  • EIP-2200 – other opcode gas price alterations.

Constantinople

📆 Feb-28-2019 07:52:04 PM +UTC
🧱 Block number: 7,280,000
💰 ETH price: $136.29 USD
🖥️ ethereum.org on waybackmachine

Summary

The Constantinople fork:

  • Ensured the blockchain didn't freeze before proof-of-stake was implemented.
  • Optimised the gas cost of certain actions in the EVM.
  • Added the ability to interact with addresses that haven't been created yet.

Read the Ethereum Foundation announcement

Constantinople EIPs

Official improvements included in this fork.

  • EIP-145 – optimises cost of certain on-chain actions.
  • EIP-1014 – allows you to interact with addresses that have yet to be created.
  • EIP-1052 – optimises cost of certain on-chain actions.
  • EIP-1234 – makes sure the blockchain doesn't freeze before proof-of-stake.

2017

Byzantium

📆 Oct-16-2017 05:22:11 AM +UTC
🧱 Block number: 4,370,000
💰 ETH price: $334.23 USD
🖥️ ethereum.org on waybackmachine

Summary

The Byzantium fork:

  • Reduced block mining rewards from 5 to 3 ETH.
  • Delayed the difficulty bomb by a year.
  • Added ability to make non-state-changing calls to other contracts.
  • Added certain cryptography methods to allow for layer 2 scaling.

Read the Ethereum Foundation announcement

Byzantium EIPs

Official improvements included in this fork.

  • EIP-140 – adds REVERT opcode.
  • EIP-658 – status field added to transaction receipts to indicate success or failure.
  • EIP-196 – adds elliptic curve and scalar multiplication to allow for ZK-Snarks.
  • EIP-197 – adds elliptic curve and scalar multiplication to allow for ZK-Snarks.
  • EIP-198 – enables RSA signature verification.
  • EIP-211 – adds support for variable length return values.
  • EIP-214 – adds STATICCALL opcode, allowing non-state-changing calls to other contracts.
  • EIP-100 – changes difficulty adjustment formula.
  • EIP-649 – delays difficulty bomb by 1 year and reduces block reward from 5 to 3 ETH.

2016

Spurious Dragon

📆 Nov-22-2016 04:15:44 PM +UTC
🧱 Block number: 2,675,000
💰 ETH price: $9.84 USD
🖥️ ethereum.org on waybackmachine

Summary

The Spurious Dragon fork was the second response to the denial of service (DoS) attacks on the network (September/October 2016) including:

  • tuning opcode pricing to prevent future attacks on the network.
  • enabling “debloat” of the blockchain state.
  • adding replay attack protection.

Read the Ethereum Foundation announcement

Spurious Dragon EIPs

Official improvements included in this fork.

  • EIP-155 – prevents transactions from one Ethereum chain from being rebroadcasted on an alternative chain, for example a testnet transaction being replayed on the main Ethereum chain.
  • EIP-160 – adjusts prices of EXP opcode – makes it more difficult to slow down the network via computationally expensive contract operations.
  • EIP-161 – allows for removal of empty accounts added via the DOS attacks.
  • EIP-170 – changes the maximum code size that a contract on the blockchain can have – to 24576 bytes.

Tangerine whistle

📆 Oct-18-2016 01:19:31 PM +UTC
🧱 Block number: 2,463,000
💰 ETH price: $12.50 USD
🖥️ ethereum.org on waybackmachine

Summary

The Tangerine Whistle fork was the first response to the denial of service (DoS) attacks on the network (September/October 2016) including:

  • addressing urgent network health issues concerning underpriced operation codes.

Read the Ethereum Foundation announcement

Tangerine Whistle EIPs

Official improvements included in this fork.

  • EIP-150 – increases gas costs of opcodes that can be used in spam attacks.
  • EIP-158 – reduces state size by removing a large number of empty accounts that were put in the state at very low cost due to flaws in earlier versions of the Ethereum protocol.

DAO fork

📆 Jul-20-2016 01:20:40 PM +UTC
🧱 Block number: 1,920,000
💰 ETH price: $12.54 USD
🖥️ ethereum.org on waybackmachine

Summary

The DAO fork was in response to the 2016 DAO attack where an insecure DAO contract was drained of over 3.6 million ETH in a hack. The fork moved the funds from the faulty contract to a new contract with a single function: withdraw. Anyone who lost funds could withdraw 1 ETH for every 100 DAO tokens in their wallets.

This course of action was voted on by the Ethereum community. Any ETH holder was able to vote via a transaction on a voting platform. The decision to fork reached over 85% of the votes.

Some miners refused to fork because the DAO incident wasn't a defect in the protocol. They went on to form Ethereum Classic.

Read the Ethereum Foundation announcement

Homestead

📆 Mar-14-2016 06:49:53 PM +UTC
🧱 Block number: 1,150,000
💰 ETH price: $12.50 USD
🖥️ ethereum.org on waybackmachine

Summary

The Homestead fork that looked to the future. It included several protocol changes and a networking change that gave Ethereum the ability to do further network upgrades.

Read the Ethereum Foundation announcement

Homestead EIPs

Official improvements included in this fork.

  • EIP-2 – makes edits to contract creation process.
  • EIP-7 – adds new opcode: DELEGATECALL
  • EIP-8 – introduces devp2p forward compatibility requirements

2015

Frontier thawing

📆 Sep-07-2015 09:33:09 PM +UTC
🧱 Block number: 200,000
💰 ETH price: $1.24 USD
🖥️ ethereum.org on waybackmachine

Summary

The frontier thawing fork lifted the 5,000 gas limit per block and set the default gas price to 51 gwei. This allowed for transactions – transactions require 21,000 gas.

Read the Ethereum Foundation announcement

Frontier

📆 Jul-30-2015 03:26:13 PM +UTC
🧱 Block number: 0
💰 ETH price: N/A
🖥️ ethereum.org on waybackmachine

Summary

Frontier was a live, but barebone implementation of the Ethereum project. It followed the successful Olympic testing phase. It was intended for technical users, specifically developers. Blocks had a gas limit of 5,000. This ‘thawing’ period enabled miners to start their operations and for early adopters to install their clients without having to ‘rush’.

Read the Ethereum Foundation announcement

2014

Ether sale

📆 July 22 - September 02, 2014
🖥️ ethereum.org on waybackmachine

Ether officially went on sale for 42 days. You could buy it with BTC.

Read the Ethereum Foundation announcement

Yellowpaper released

📆 April 01, 2014
🖥️ ethereum.org on waybackmachine

The Yellow Paper, authored by Dr. Gavin Wood, is a technical definition of the Ethereum protocol.

View the Yellow Paper

2013

Whitepaper released

📆 November 27, 2013
🖥️ ethereum.org on waybackmachine

The introductory paper, published in 2013 by Vitalik Buterin, the founder of Ethereum, before the project's launch in 2015.

📃

Whitepaper

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