Ethereum's blockchain reached 10 million blocks on May 4, 2020, marking five years of evolution. This journey involved numerous hard forks—network upgrades that shaped today's Ethereum mainnet. Below, we explore each milestone fork chronologically.
Key Ethereum Forks: Dates and Block Heights
Testnet Phase: Olympic—Block #0
Release Date: May 9, 2015
Olympic served as Ethereum's proof-of-concept testnet, offering 25,000 ETH in bounties to stress-test transactions and mining. Though technically distinct from mainnet, its 14-day run laid groundwork for Frontier's genesis block.
Frontier—Block #0
Launch: July 30, 2015
Frontier debuted Ethereum 1.0 with:
- Genesis block containing 8,893 presale ETH transactions.
- Pre-mined 72M ETH (12M allocated to development funds).
- Initial gas limit of 5,000 (later adjusted to 3,141,592 post-"thawing" period).
Notable Event:
- First transaction (31,337 wei) occurred in Block #46,147.
Ice Age—Block #200,000
Purpose: Transition catalyst from PoW to PoS.
Exponentially increasing block difficulty aimed to freeze mining ("Ice Age"). Subsequent forks delayed this to allow continued PoW mining.
Homestead—Block #1,150,000
Key EIPs:
- EIP 2: Protocol upgrades.
- EIP 7: Introduced
DELEGATECALL. - EIP 8: P2P compatibility standards.
DAO Fork—Block #1,920,000
Controversial Split (2016):
After the DAO hack (3.6M ETH stolen), EIP 779 enabled fund recovery via hard fork. Opponents continued the original chain as Ethereum Classic (ETC).
Tangerine Whistle—Block #2,463,000
Emergency Fix:
- EIP 150 repriced opcodes to mitigate denial-of-service attacks.
Spurious Dragon—Block #2,675,000
Post-Attack Measures:
- EIP 155: Replay attack protection.
- EIP 161: State tree cleanup.
Byzantium—Block #4,370,000
Metropolis Phase 1 (2017):
- Added 4 opcodes (e.g.,
RETURNDATACOPY). - Reduced block rewards.
- Delayed difficulty bomb.
Constantinople/St. Petersburg—Block #7,280,000
Metropolis Phase 2 (2019):
- EIP 1014: Enabled
CREATE2. - Postponed after EIP-1283 vulnerability detection.
Istanbul—Block #9,069,000
Technical Upgrades:
- EIP 152: BLAKE2 compression support.
- EIP 2200: Gas metering adjustments.
👉 Explore Ethereum's evolution further
Muir Glacier—Block #9,200,000
Single EIP:
- EIP-2384: Delayed difficulty bomb again.
Serenity (ETH 2.0)—TBD
Upcoming:
- PoS beacon chain.
- Sharding.
- eWASM integration.
FAQ Section
Q: Why did Ethereum Classic split from Ethereum?
A: It opposed the DAO fork, maintaining the original chain’s immutability.
Q: What’s the purpose of difficulty bombs?
A: To incentivize transitions (e.g., PoW to PoS) by gradually halting mining.
Q: How does CREATE2 improve smart contracts?
A: Predictable contract addresses enable advanced state channels.
👉 Stay updated on Ethereum upgrades
Final Note:
Ethereum’s forks reflect its adaptability—balancing innovation, security, and community consensus. For real-time updates, follow trusted sources like OKX.
### Key SEO Elements:
- **Keywords**: Ethereum hard forks, DAO fork, ETH 2.0, Byzantium, Constantinople.
- **Structure**: Chronological headings (H2/H3), bulleted lists, and FAQs.