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Blockchain LabTHE VENTURE STUDIO

LibraryScaling2020Design paperCorpus record

Validium and the Data-Availability Spectrum

Validium. StarkWare.

Validium proves execution and keeps the data off the parent chain, with a committee or another store. Volition lets a user choose, per state, whether the data sits on the parent.

A reading of the public document. Not a copy of it, and not a claim about a later network that reused the name.

If a chain markets a ZK proof, ask where a user gets the bytes to exit.

The five-minute read

The defect

A validity proof shows a state transition was correct. It does not show that anyone can reconstruct the state.

The rule

Validium proves execution and keeps the data off the parent chain, with a committee or another store. Volition lets a user choose, per state, whether the data sits on the parent.

How it is put together

A proof without data can freeze withdrawals. The committee is a trust assumption the proof does not remove. Volition is a choice, not a default.

Where the claim stops

Validium is not a rollup, if rollup means data on the parent.

One action, walked through

  1. The operator executes and produces a proof.
  2. The parent verifies the proof.
  3. Users who need an exit must have the data from somewhere other than the parent, unless they paid to put it there.
  4. Where is the state data?

The argument, unpacked

Why it is still on the desk

If a chain markets a ZK proof, ask where a user gets the bytes to exit.

After the text

StarkEx shipped validium and volition modes. The distinction is still the right one for any later chain that proves but does not publish.

What has to be true

  • Validium is not a rollup, if rollup means data on the parent.
  • The essay is a design argument, not a formal proof.
  • A committee can withhold data even when the proof is true.

What happened after the paper

StarkEx shipped validium and volition modes. The distinction is still the right one for any later chain that proves but does not publish.

What to check before you use the idea

  • Where is the state data?
  • Who can withhold it?
  • Can a user force an exit from the parent alone?

Terms

Validium
A validity proof with data kept off the parent chain.
Volition
A system that lets some state be on-chain and some off.

The problem the paper names

A validity proof shows a state transition was correct. It does not show that anyone can reconstruct the state.

What the design proposes

  • A proof without data can freeze withdrawals.
  • The committee is a trust assumption the proof does not remove.
  • Volition is a choice, not a default.

How the mechanism is specified

  • The operator executes and produces a proof.
  • The parent verifies the proof.
  • Users who need an exit must have the data from somewhere other than the parent, unless they paid to put it there.

What this page does not treat as proven

  • Validium is not a rollup, if rollup means data on the parent.
  • The essay is a design argument, not a formal proof.
  • A committee can withhold data even when the proof is true.

Why a venture studio still reads it

If a chain markets a ZK proof, ask where a user gets the bytes to exit.

This is Blockchain Lab's reading of a public design paper. It is not the paper, not a copy of it, and not an offer of tokens, equity, custody or a partnership. Later network behaviour can diverge from the text. Nothing here is investment, legal or technical advice.

Research status: Design paper. Last reviewed: 1 October 2026. This is a reading of a public paper, not investment, legal or security advice.