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EIP-8142 Block-in-Blobs (BiB)

DraftCorecreated 2026-01-29requires EIP-4844, EIP-7594, EIP-7732, EIP-7892, EIP-7928

Ensures execution payload data availability via blobs

Authors: Kevaundray Wedderburn (@kevaundray), Ignacio Hagopian (@jsign), Jihoon Song, Francesco Risitano (@frisitano), Thomas Thiery (@soispoke), Toni Wahrstätter (@nerolation), Péter Garamvölgyi (@thegaram)

Depends on (5)

Proposals this one names in its requires field.

EIP-4844Shard Blob TransactionsEIP-7594PeerDAS - Peer Data Availability SamplingEIP-7732Enshrined Proposer-Builder SeparationEIP-7892Blob Parameter Only HardforksEIP-7928Block-Level Access Lists

What the specification covers

AbstractMotivationSpecificationTerminologyOverview and InvariantsParametersReferenced ParametersDerived ConstantsExecution LayerReferenced HelpersHelpersbytes_to_blobsblobs_to_bytesget_execution_payload_dataexecution_payload_data_to_blobsblobs_to_execution_payload_dataextract_data_from_type_3_txData structuresExecutionPayloadDataHeaderBlobsBundleEngine APIengine_getPayload - Native Variantengine_getPayload - zkEVM-Optimized Variantengine_newPayload - Native Execution Variantengine_newPayload - zkEVM-Optimized VariantConsensus LayerData structuresExecutionPayloadValidationNetworkingFee AccountingWho pays?Do payload-blobs compete with transaction blobs for capacity?Can a builder artificially inflate blob gas usage?Open questions and future considerationsRationaleWhat is included in execution-payload data?Builder discretion vs reserving k blobsWhy not encode execution-payload data inside the core EL execution logic?When zkEVM proofs become mandatory, why can't zk-attestors download the full execution payload?Compression algorithm for encoding execution-payload dataSerialization algorithm for encoding execution-payload dataBackwards CompatibilityTest CasesReference ImplementationSecurity ConsiderationsCopyright

This proposal declares no Solidity interface, so there is nothing to compute. It may be a core protocol change, a meta proposal, or written in prose only.

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