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  1. Home
  2. /Glossary
  3. /Uncle Block
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blockchain

Uncle Block

A valid block that was mined at the same time as another block but didn't make it into the main chain.

Definition

A valid block that was mined at the same time as another block but didn't make it into the main chain. In Ethereum's proof-of-work era, uncle blocks were partially rewarded to reduce miner centralization. Since Ethereum moved to proof-of-stake, uncle blocks no longer exist.

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Related Terms

Block

A bundle of transactions that gets permanently added to the blockchain.

Mining

Using computational power to validate transactions and create new blocks on proof-of-work blockchains.

Proof of Work (PoW)

A consensus mechanism where miners solve computational puzzles to create blocks and earn rewards.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

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