EIP-8016

SSZ CompatibleUnion

SSZ type for forward-compatible unions

Status history

Draft28 Aug 2025

Abstract

This EIP introduces a new Simple Serialize (SSZ) type to represent unions with forward-compatible Merkleization: A given field is always assigned the same stable generalized index (gindex) across all type options.

Created: 28 Aug 2025
Authors: Etan Kissling, Cayman
Upgrades: Not listed in any upgrade
Requires: EIP-7495 EIP-7916
Required by: EIP-6404 EIP-6466

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