Verification Classes
A clear label for how each World establishes confidence in its results.
Every public World should state its verification class and trust assumptions.
LOCAL
Execution occurs locally or privately. Spawn makes no public reproducibility or settlement claim.
RECORDED
The World publishes its configuration, inputs, and outputs. The record can be inspected, but independent reproduction is not guaranteed.
REPLAYABLE
An independent party can rerun the pinned Blueprint, data, configuration, seed, and ordered inputs and compare checkpoint commitments.
ATTESTED
A disclosed set or quorum of qualified verifiers signs an accepted result. Users must understand verifier selection, independence, bonds, and collusion risk.
ONCHAIN
The relevant transition or settlement logic executes directly onchain. This reduces some trust assumptions but does not prove that the Model, inputs, or economic design are useful or correct.
Choosing a class
Higher economic exposure requires stronger evidence and tighter limits. A label must never overstate what was checked. REPLAYABLE means reproducible under the declared conditions; it does not mean scientifically true. ATTESTED is not a mathematical proof.
The production interface should display the class before participation and link to the exact verification policy.