📌 Chain Reorganisation Summary

Chain reorganisation is a process that occurs in blockchain networks when two versions of the transaction history temporarily exist and the network must decide which one to continue building upon. This usually happens when miners find blocks at nearly the same time, creating competing chains. The network resolves this by choosing the longest valid chain, and any transactions in discarded blocks are put back into the pool for confirmation.

🙋🏻‍♂️ Explain Chain Reorganisation Simply

Imagine two students writing the same story, but one finishes a longer version first. The teacher picks the longer story, and the other student has to copy that version instead. In blockchains, the network chooses the chain with the most work, so everyone agrees on the same history.

📅 How Can it be used?

Chain reorganisation ensures that all users and applications see the same transaction history, even if temporary forks occur.

🗺️ Real World Examples

In Bitcoin, if two miners solve a block at the same time, the network briefly splits. When one chain gets an extra block, the network switches to that longer chain, discarding the shorter one and reprocessing its transactions.

In Ethereum, decentralised exchanges may temporarily show a transaction as complete, but if a chain reorganisation occurs, that transaction could be reversed and resubmitted, affecting balances and trade outcomes.

✅ FAQ

Chain reorganisation happens when two versions of a blockchain briefly exist at the same time. This usually occurs because miners find new blocks almost simultaneously, creating a temporary split. The network then picks the longest valid chain to continue, making sure everyone agrees on the same transaction history.

Chain reorganisation is important because it ensures that the blockchain remains consistent and secure. If your transaction ends up in a block that gets discarded during reorganisation, it is simply returned to the pool to be confirmed again. This process helps protect against mistakes and keeps the system fair for everyone.

No, chain reorganisation does not mean your transaction is lost. If your transaction was included in a block that is dropped, it goes back into the waiting list for miners to include it in a future block. You might experience a short delay, but your transaction will still go through as long as it is valid.

📚 Categories

• Blockchain
• Cryptographic Primitives
• Decentralised Systems

🔗 External Reference Links

Chain Reorganisation link

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