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HomeBlogDeep Chain Reorganization Detected on Ethereum Classic (ETC)

Deep Chain Reorganization Detected on Ethereum Classic (ETC)


  • Over the weekend, Coinbase discovered the deep chain reorganizations, forcing the cryptocurrency company to halt all Ethereum Classic transactions on their trading platforms and other products and services.
  • According to Coinbase, a 51% attack on Ethereum Classic, the first unforked Ethereum blockchain, led to the double spending of about $500,000.

Blockchain technology has undoubtedly transformed the digital landscape, enabling secure and transparent transactions. Ethereum Classic (ETC), a notable blockchain platform, has recently encountered a significant deep chain reorganization, causing waves within the cryptocurrency community. 

In this blog, we will explore the concept of deep chain reorganization, its potential triggers, and its far-reaching consequences for Ethereum Classic and the broader blockchain realm.

How Deep Network Reorganization Works?

A chain reorganization occurs when the established blockchain is altered due to a divergence in the consensus among nodes. 

In simpler terms, previously confirmed transactions can become unconfirmed, rewriting parts of the blockchain’s history. A deep chain reorganization goes beyond the typical reorganization, involving many blocks being discarded and replaced by an alternative chain.

Causes of Deep Chain Reorganizations

Deep chain reorganizations can occur for various causes, including technological weaknesses, network attacks, or protocol flaws in the blockchain. 

A 51% assault, in which an evil actor controls more than 50% of the network’s processing power, allowing them to change transaction history, is one of the most typical reasons. 

Software bugs, network congestion, and irregularities in block propagation can also contribute to chain reorganizations.

Implications for Ethereum Classic

The recent deep chain reorganization of Ethereum Classic has raised concerns within the crypto community. Such events can lead to:

  • Double Spending 

Chain reorganizations can enable double-spending attacks, where an attacker spends twice the same cryptocurrency by exploiting the altered transaction history. It threatens the integrity and trust of the blockchain.

  • Network Confidence

Deep chain reorganizations erode confidence in the network’s stability and security. Participants, including miners and users, may question the reliability of the blockchain, impacting its credibility.

  • Exchange Vulnerabilities

Cryptocurrency exchanges trading ETC may face challenges if transactions are reversed due to a reorganization. It could result in financial losses for traders and exchanges.

  • Network Upgrades

To prevent future deep chain reorganizations, the Ethereum Classic development team might consider implementing upgrades or changes to enhance security and consensus mechanisms.

Response and Mitigation

Ethereum Classic developers and stakeholders responded swiftly to address the deep chain reorganization. This incident highlighted the importance of maintaining a robust network and implementing preventive measures:

  • Heightened Security

Developers may implement enhanced security measures, such as improved encryption, to reduce the vulnerability to attacks.

  • Network Upgrades

Hard forks or network upgrades can be considered to fortify the network’s defences against similar incidents in the future.

  • Enhanced Monitoring 

Regular monitoring of the network’s health and performance can help identify anomalies and potential attacks, enabling quicker responses.

  • Community Education 

Educating the Ethereum Classic community about the importance of network security and the risks associated with chain reorganizations can encourage vigilant participation.


The recent deep chain reorganization Ethereum Classic experienced underscores the blockchain space’s dynamic and evolving nature. 

While such events raise concerns, they also prompt developers and stakeholders to work collectively toward fortifying blockchain networks against potential vulnerabilities. 

The incident highlights the significance of ongoing research, development, and community involvement in maintaining the integrity and reliability of blockchain platforms like Ethereum Classic. 

These experiences contribute to a more secure and resilient blockchain ecosystem as the industry matures.


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