Blob (EIP‑4844)

Binary payload attached to special transactions to lower data availability costs for rollups.

BLS Signature

Signature scheme supporting efficient aggregation, widely used in Ethereum staking and consensus.

Bloom Filter

Probabilistic data structure for fast set membership checks with false positives but no false negatives.

Blockspace

The scarce resource of on‑chain computation and data availability that users bid for via fees.

Block Time

Average time between consecutive blocks on a chain, affecting latency and UX.

Block Reward

Native issuance and fees awarded to the entity that proposes or validates a block.

Block Height

Number of blocks in the chain up to a given block, starting at zero for the genesis block.

Block Header

Summary fields of a block, including parent hash, state roots, timestamp, and other consensus data.

Block Gas Limit

Maximum total gas that can be consumed by all transactions in a block, constraining throughput.

Block Explorer

Web app for inspecting blocks, transactions, addresses, and contract state on a blockchain.

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