• DAO
• lets say in DAO attack ethers were gone ,then you said that by using hard fork they rollback the all nodes ,if this happens then how ethers will comeback?
• but blockchain is immutable then how they rewrite it?
• they are in separate blockchain then how they can maintain transparency if one person is on two different blockchain networks?

DAO Attack Mind Map.pdf

• summary

TYPES OF FORKS

A codebase fork and a live blockchain fork are terms commonly used in the context of blockchain technology to describe different aspects of the development and evolution of a blockchain network. Let's break down each of these concepts and explore how live blockchain forks are further categorized into intentional and accidental forks, and how intentional forks can be either soft or hard forks.

1. Codebase Fork:

   • A codebase fork occurs in the development phase of a blockchain project. It refers to when a group of developers or an individual takes the existing source code of a blockchain project and creates a new project based on that code. The new project is typically a separate blockchain with its own features, rules, and possibly a different vision for the network's future.

2. Live Blockchain Fork:

   • A live blockchain fork takes place when there is a divergence in the blockchain's transaction history, resulting in the creation of two separate and potentially incompatible chains. This typically happens when there's a disagreement within the blockchain community regarding network upgrades, rules, or protocol changes.

   Live blockchain forks are further divided into two main categories:

   a. Intentional Fork:

   • An intentional fork occurs when the blockchain community deliberately decides to make significant changes to the blockchain's protocol. This could be to implement new features, improve scalability, or resolve issues. Intentional forks can be further classified into soft forks and hard forks.

   i. Soft Fork:

   • A soft fork is a type of intentional fork where the new rules are backward-compatible with the old ones. This means that nodes running the old software can still participate in the network without any issues. Soft forks typically involve tightening or restricting the rules of the blockchain. Nodes that upgrade to the new rules will continue to validate transactions, while those that don't may still operate on the network, but their transactions may not be accepted by the upgraded nodes.

   ii. Hard Fork:

   • A hard fork, on the other hand, is an intentional fork where the new rules are not backward-compatible with the old ones. This results in a permanent split in the blockchain, creating two separate and divergent chains. Nodes and miners must choose which chain to follow based on their software and consensus rules. Hard forks often involve significant protocol changes and are typically more contentious than soft forks.

   b. Accidental Fork:

   • An accidental fork is an unplanned event that can occur due to network issues, software bugs, or synchronization problems among nodes. In an accidental fork, there is a temporary divergence in the blockchain, but it is not the result of a deliberate decision by the community. The fork typically gets resolved when the network reaches consensus on which chain is the valid one, and the other chain is discarded.

In summary, codebase forks involve creating a new project based on existing blockchain source code, while live blockchain forks involve the splitting of an existing blockchain into two separate chains due to changes in the network's protocol. Live blockchain forks can be intentional (soft or hard forks) or accidental, depending on the cause and intention behind the fork.

Summary...............................

Highlights
📝 Forks in our lives represent big decisions that can completely change our path.
📝 In cryptocurrency, a fork refers to two potential ways a blockchain could continue.
📝 Soft forks require no changes from miners, while hard forks require updates to continue mining.
📝 Ethereum Classic was created due to a fork in the Ethereum blockchain.
📝 Litecoin and Bitcoin Cash are examples of forks with specific changes to improve scalability and transaction speed.
Key Insights
🧐 Soft forks are considered more dangerous in cryptocurrency as they can make major changes without agreement from all participants.
🧐 Ethereum Classic is an example of a fork that resulted from a controversial decision to revert a blockchain transaction.
🧐 Litecoin and Bitcoin Cash are forks that made specific improvements to increase transaction speed and scalability.

A soft fork in crypto doesn't require miners to do anything different, while a hard fork requires miners to make changes. 
Ethereum Classic was created through a hard fork. Vitalik Buterin believes soft forks are more dangerous as they can make major changes without agreement. 
Litecoin and Bitcoin Cash are examples of successful forks. Forks will continue to happen in the crypto world as projects progress.