# Issuance Escrow Issuance Escrow, which is one per issuance, helps manages the locked assets for individual issuance. Issuance Escrows only work on ERC20 tokens, as ETH is converted into Wrapped ETH token by Instrument Escrow. Instrument can optionally define whether an Issuance Escrow is needed for this instrument. For example, an off-chain order book-based swap does not need an Issuance Escrow as the asset swap could be settled directly on Instrument Escrow. Instrument Escrows are required by default. Instrument Manager is the only contract that could operate the assets in Issuance Escrows, while others can only check its balance information. When an asset transfer is needed, the issuance contract will tell Instrument Manager what are the desired asset transfer actions. Instrument Manager performs the actual asset transfer actions. Instrument can optionally define whether issuance transaction is supported. If set to true, issuance instance is also granted the admin role of the Instrument Escrow, which means issuance instance can also operates on the assets in Issuance Escrow. This is useful for issuances that want to deposit its locked assets into third-party protocols such as Compound. However, this is only an experimental feature and is not used by existing financial instruments. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.nuts.finance/implementation/escrow/issuance-escrow.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.