--- eip: 7872 title: Max blob flag for local builders description: Adds a flag to set the maximum number of blobs a local builder will put in a block author: Francesco D'Amato , Kevaundray Wedderburn (@kevaundray), Toni Wahrstätter (@nerolation), Alex Stokes (@ralexstokes), Ben Adams (@benaadams), Gajinder Singh (@g11tech), Dustin (@tersec) discussions-to: https://ethereum-magicians.org/t/max-blob-flags-for-local-builders/22734 status: Review type: Meta created: 2025-01-30 --- ## Abstract This EIP adds a flag to the block builder in order to allow them to include a client configured maximum amount of blobs. This is an execution layer only change. ## Motivation Currently a builder will include all blobs in their local mempool, up to the maximum amount that the protocol requires. If a builder has low bandwidth, they may include too many blobs and subsequently end up not being able to convince the network that the blobs are available. ## Specification - Create a parameter in block builder's configuration called `USER_CONFIGURED_MAX_BLOBS_PER_BLOCK` - Take the minimum out of the `MAX_BLOB_GAS_PER_BLOCK` and the `USER_CONFIGURED_MAX_BLOBS_PER_BLOCK` - If the minimum is zero, set the minimum to one. - Use the minimum to decide how many blobs to include in the block Note: By default `USER_CONFIGURED_MAX_BLOBS_PER_BLOCK` may be set to the maximum in the current fork. ## Rationale By adding a flag for the local block builder, they are able to specify how many blobs they can include in a block. ## Backwards Compatibility No backward compatibility issues found. ## Security Considerations N/A ## Copyright Copyright and related rights waived via [CC0](../LICENSE.md).