Definition ∞ A chain reorg, or reorganization, is an event on a blockchain where a different sequence of blocks becomes the accepted longest chain. This typically occurs in proof-of-work systems when two or more miners find a block at roughly the same time, leading to a temporary divergence. The network eventually converges on one chain, invalidating the blocks on the shorter, orphaned chain.
Context ∞ Discussions about chain reorganizations in crypto news often arise following network instability or concerns about the finality of transactions. These events can impact the security of decentralized exchanges and lending protocols that rely on a stable transaction history. Observers should monitor the frequency and depth of reorgs on various blockchains, as significant reorganizations can undermine confidence in a network’s integrity.
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