What term is used to describe a rollup that lacks a settlement layer?

Question: What term is used to describe a rollup that lacks a settlement layer?

A rollup is a layer 2 scaling solution that aggregates transactions and executes them on a sidechain, before periodically committing them to the main chain. A rollup can be either optimistic or zero-knowledge, depending on the type of proof used to verify the validity of the transactions.

A settlement layer is a layer 1 protocol that provides security and finality for the transactions on the rollup. A settlement layer is essential for ensuring that the rollup is not vulnerable to attacks or frauds, and that the users can withdraw their funds from the rollup in case of any dispute or failure.

A rollup that lacks a settlement layer is called a **naked rollup**. This term is used to describe a rollup that relies solely on the sidechain for validation and execution, without any connection or commitment to the main chain. A naked rollup is very risky and inefficient, as it exposes the users to various threats such as censorship, double-spending, data unavailability, and corruption. A naked rollup also has no way of resolving disputes or enforcing contracts, as there is no higher authority or arbiter to appeal to. A naked rollup is therefore not recommended for any serious or valuable transactions, and should be avoided by users who value security and reliability.

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