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EIP-8347 Offline State Migration to the PBT

DraftCorecreated 2026-07-23requires EIP-7523, EIP-7928, EIP-8159, EIP-8297

Convert state to the PBT off the consensus-critical path, distribute a verifiable snapshot, and swap the commitment at a single fork

Authors: Carlos Perez (@CPerezz), Maria Silva (@misilva73), Kevaundray Wedderburn (@kevaundray)

Depends on (4)

Proposals this one names in its requires field.

EIP-7523Empty accounts deprecationEIP-7928Block-Level Access ListsEIP-8159eth/71 - Block Access List ExchangeEIP-8297Partitioned Binary Tree

What the specification covers

AbstractMotivationSpecificationParametersProcess overviewActors and rolesPreimagesThe converterPBT snapshot artifactLeaf recordCanonical digestsVerification (dual-check)BAL-replayReplay deletion semanticsReorg handlingBAL availabilityRe-anchoringShadow commitmentActivationTransition windowRationaleWhy offline conversion instead of the online overlayWhy an anchor block and a single forkWhy BAL-replay for catch-upWhy shadow roots, and why publication is not a consensus ruleBackwards CompatibilityTest CasesSecurity ConsiderationsUnvalidated-flip inputShadow-root coverageDistribution trustRecoverabilityCopyright

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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