A blockchain reorganization, or 'reorg', occurs when two miners simultaneously produce blocks that extend the same previous block, temporarily splitting the chain. The network eventually agrees on the longest chain (by total work), causing some blocks to become orphaned.
Why did Foundry USA get preferred over Antpool and ViaBTC after block 941,881?▼
Foundry USA mined additional blocks (up to 941,886) quickly, extending their chain with more cumulative work than the temporary branch by Antpool/ViaBTC. Nodes adopt the chain with the most work, so Foundry’s chain became canonical.
What happens to transactions in orphaned blocks during a reorganization?▼
Transactions from orphaned blocks are not permanently lost. They are returned to the mempool and can be included in subsequent blocks on the winning chain, ensuring they are eventually confirmed.
Who loses mining rewards in this reorg scenario?▼
Miners who built on the shorter, orphaned branch (Antpool and ViaBTC in this case) lose the block rewards and fees for those blocks because their blocks are no longer part of the main chain.
How common are Bitcoin blockchain reorganizations like this one?▼
Reorganizations occur occasionally due to network latency or competing miners, but deep reorgs (>2-3 blocks) are rare. This event involved a small reorg (4 blocks) and was resolved smoothly by the network.
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