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EIP-7916 SSZ ProgressiveList

ReviewCorecreated 2025-03-2411 later proposals build on it

SSZ types for efficiently hashing short lists

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

Built on by (11)

Later proposals that name this one in their requires field.

EIP-6404SSZ transactionsEIP-6465SSZ withdrawals rootEIP-6466SSZ receiptsEIP-7495SSZ ProgressiveContainerEIP-7688Forward compatible consensus data structuresEIP-7745Trustless log and transaction indexEIP-7799System logsEIP-7807SSZ execution blocksEIP-7919Pureth MetaEIP-8016SSZ CompatibleUnionEIP-8321Hash-Chain RANDAO

What the specification covers

AbstractMotivationSpecificationProgressive Merkle treeProgressiveList[type] and ProgressiveBitlistSerializationMerkleizationRationaleWhy a recursive structure?Why not dynamic depth?Why not fixed-capacity lists?Why are initial leaf count and scaling factors not exposed parameters?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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