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EIP-8016 SSZ CompatibleUnion

DraftCorecreated 2025-08-282 later proposals build on itrequires EIP-7495, EIP-7916

SSZ type for forward-compatible unions

Authors: Etan Kissling (@etan-status), Cayman (@wemeetagain)

Depends on (2)

Proposals this one names in its requires field.

EIP-7495SSZ ProgressiveContainerEIP-7916SSZ ProgressiveList

Built on by (2)

Later proposals that name this one in their requires field.

EIP-6404SSZ transactionsEIP-6466SSZ receipts

What the specification covers

AbstractMotivationSpecificationCompatibleUnion({selector: type})Compatible MerkleizationSerializationDeserializationJSON mappingMerkleizationRationaleWhy are CompatibleUnion selectors limited to 1 ... 127?Why not field collections?Backwards 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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