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Definition of "Ghost"

GHOST (Greedy Heaviest Observed Subtree) is a protocol by which blocks can contain a hash of not just their parent but also hashes for stale blocks (blocks that were verified but whose chains were abandoned as no longer dominant) that are other children of the parent’s parent (called uncles). This ensures that stales still contribute to blockchain security and mitigates a problem with fast blockchains that allows large miners to have an advantage by knowing immediately which blocks are verified, therefore being less likely to generate stales.

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