Bitcoin, the most popular digital currency, recently experienced a rare two-block chainsplit. This occurs when two miners produced separate blocks at the same block height, subsequently leading to a split in the blockchain. These splits are sporadic but the last one happened in November 2020. This raises the chance of a two-block chainsplit due to recent increase in stale blocks. A stale block is a block which was previously accepted but is no longer part of the longest chain due to a reorganisation in the blockchain.

For Bitcoin, multiple blocks were produced at the same block height which caused this chainsplit. As new blocks are processed and linked to one of the blocks as their parent, the longer and heavier chain survives, while the other block become stale. Some explorers would forget about the stale blocks as the timestamp of a block is not necessarily reliable due to Bitcoin's Block Timestamp Protection Rules.

Although this Chainsplit rarely occurs, the cryptocurrency community have not responded to it much with many simply shrugging it off. This is possibly due to the fact that, in the past, all chainsplits have resulted in a safe resolution where the shorter of the two chains become abandoned by the network.



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