Reorg, short for blockchain reorganization, occurs when a blockchain network temporarily accepts a new series of blocks that diverges from the previously accepted chain. This situation often arises when two miners produce blocks simultaneously, creating a temporary fork.When this happens, nodes in the network may receive different versions of the blockchain. Eventually, as more blocks are mined, one version will become longer and thus more viable. Nodes will then abandon the shorter chain in favor of the longer one, leading to a reorg.While reorgs are usually a natural part of decentralized networks and generally pose no significant threat, large or frequent reorganizations can result in issues like double-spending, where a user tries to spend the same cryptocurrency in two different transactions. This can undermine trust in the network’s security.Miners and nodes typically seek to minimize the occurrence of reorgs by following network rules, but they remain a consideration for developers and users who want to ensure the integrity and stability of the blockchain.