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An uncle block is a validated block that got a silver rather than gold medal, because another miner propagated a competing block more rapidly, and therefore won the “race” to become the next confirmed block on the blockchain. Uncle blocks get a fraction of the full block reward.

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What is an uncle/ommer block?

In case of proof-of-work mining, there are many miners trying to mine the same set of transactions at the same time. Since the block mining time is very short (about 15 sec. in case of ethereum) there …
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